IPAC2015 - List of Keywords (controls)

Paper	Title	Other Keywords	Page
MOAB3	Commissioning Results of the New BPM Electronics of the ESRF Booster Synchrotron	booster, electronics, extraction, injection	24
	M. Cargnelutti I-Tech, Solkan, Slovenia K.B. Scheidt ESRF, Grenoble, France
	The 75 BPM stations of the Booster Synchrotron of the ESRF have been equiped with new RF electronics from December 2014. This new BPM system is based on the commercial Libera-Spark system and now provides beam position data at various output rates, and with a possible time resolution even below that of the orbit-turn time (1 us). All modules are situated inside the Booster tunnel and powered by an Ethernet cable. This implies that the RF cables from the BPM blocks are less then 3 m and only a single trigger signal in daisy chain is sufficient to keep the 75 stations in turn-by-turn phase over the full energy ramping (200 MeV to 6 GeV) time of typically 50 ms. The high sensitivity of the system yields excellent performance at very low beam currents down to 1 0uA. Full results of the system, including the application as a high quality betatron tune monitor, will be presented.
	Slides MOAB3 [5.781 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOAB3
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MOBB2	Fabrication of TESLA-shape 9-cell Cavities at KEK for Studies on Mass-Production in Collaboration with Industries	cavity, SRF, cryomodule, status	31
	T. Saeki, H. Hayano KEK, Ibaraki, Japan
	The construction of the new Center-of-Innovation (COI) buiding started at KEK from 2014 for the studies of mass-production of Superconducting-RF accelerators in collaboration with industries. The COI buiding is sitting next to the existing KEK-STF building and will include various Superconducting-RF facilities like clean-room for cavity-string assembly, cryomodule-assembly facility, cryogenic system, vertical-test facility, cryomodule-test facility, input-coupler processing facility, cavity Electro-Polishing (EP) facility, and control-room/office-rooms in the dimension of 80 m x 30 m. The purpose of this new SRF facilities is to establish a close collaboration between SRF researchers and industries in order to prepare for the upcoming large-scale future SRF project, like ILC. This article reports the fabricaion of four TESLA-shape 9-cell cavities for the commisioning of these new facilities. Details of the fabrication of these four cavities will be presented.
	Slides MOBB2 [3.983 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOBB2
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MOAD2	RF Breakdown of 805 MHz Cavities in Strong Magnetic Fields	cavity, Windows, operation, klystron	53
	D.L. Bowring, A.V. Kochemirovskiy, M.A. Leonova, A. Moretti, M.A. Palmer, D.W. Peterson, K. Yonehara Fermilab, Batavia, Illinois, USA B.T. Freemire IIT, Chicago, Illinois, USA A.A. Haase SLAC, Menlo Park, California, USA P.G. Lane, Y. Torun Illinois Institute of Technology, Chicago, Illinois, USA D. Stratakis BNL, Upton, Long Island, New York, USA
	Ionization cooling of intense muon beams requires the operation of high-gradient, normal-conducting RF structures in the presence of strong magnetic fields. We have measured the breakdown rate in several RF cavities operating at several frequencies. Cavities operating within solenoidal magnetic fields B > 0.25 T show an increased RF breakdown rate at lower gradients compared with similar operation when B = 0 T. Ultimately, this breakdown behavior limits the maximum safe operating gradient of the cavity. Beyond ionization cooling, this issue affects the design of photoinjectors and klystrons, among other applications. We have built an 805 MHz pillbox-type RF cavity to serve as an experimental testbed for this phenomenon. This cavity is designed to study the problem of RF breakdown in strong magnetic fields using various cavity materials and surface treatments, and with precise control over sources of systematic error. We present results from tests in which the cavity was run with all copper surfaces in a variety of magnetic fields.
	Slides MOAD2 [10.792 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOAD2
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MOPWA027	Generic Settings Generation for FAIR: First Experience at SIS18	resonance, framework, operation, cavity	156
	D. Ondreka, J. Fitzek, H. Liebermann, R. Müller GSI, Darmstadt, Germany
	The accelerators of the FAIR facility will be operated using a new control system presently under design at GSI. One of its major components, the module for settings generation and management, is based on the framework LSA developed at CERN. Its task is the provision and administration of set values for all devices in the FAIR facility. The set values for any accelerator are derived from a machine model, implemented by accelerator physicists using the features of the LSA framework. In view of the large number of accelerators in the FAIR facility, the aim is to develop a generic model, applicable to any of those machines. This requires the introduction of an additional logical layer on top of the LSA framework, ensuring the coherence of the modeling strategy across all accelerators. Following this design concept, a prototype of the FAIR settings management system has been realized at GSI, providing support for a large number of operation modes relevant for the later operation of FAIR. The prototype has been used extensively during recent machine experiments with the synchrotron SIS18, performed both to benchmark the machine model and to support further machine developments for FAIR.
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MOPWA028	Resonance Compensation for High Intensity Bunched Beams	resonance, space-charge, sextupole, ion	159
	G. Franchetti, S. Aumon, F. Kesting, H. Liebermann, C. Omet, D. Ondreka, R. Singh GSI, Darmstadt, Germany
	Mitigation of periodic resonance crossing induced by space charge is foreseen via classic resonance compensation. The effect of the space charge is, however, not obvious on the effectiveness on the compensation scheme. In this proceeding we report on an experimental campaign performed at SIS18 in an attempt to investigate experimentally the effect of space charge on the resonance compensation. The experimental results and their consequences are discussed through numerical simulations.
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MOPWA031	A New Approach for Resistive Wakefield Calculations in Time Domain	wakefield, impedance, simulation, cavity	168
	A.V. Tsakanian, H. De Gersem, E. Gjonaj, T. Weiland TEMF, TU Darmstadt, Darmstadt, Germany M. Dohlus, I. Zagorodnov DESY, Hamburg, Germany
	We report on a new numerical technique for the computation of the wakefields excited by ultra-short bunches in the structures with walls of finite conductivity. The developed 3D numerical method is fully time domain. It is based on special Staggered Finite Volume Time Domain (SFVTD) method and has no numerical dispersion in all three axial directions simultaneously. This results in large saving in computational time as well as improved accuracy. The resistive boundary model applies Surface Impedance Boundary Condition (SIBC) evaluation in time domain and covers boundary effects like frequency dependent conductivity, surface roughness and metal oxidation. A good agreement between numerical simulation and perturbation theory is obtained. In addition the new method allows implementation of moving mesh approach that considerably reduces requirements on computational resources. The developed method is especially effective for short range resistive wakefield calculations excited by ultra-short bunches used in FEL based LINACs.
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MOPWA040	Virtual Cavity Probe Generation using Calibrated Forward and Reflected Signals	cavity, coupling, flattop, laser	200
	S. Pfeiffer, V. Ayvazyan, J. Branlard, L. Butkowski, H. Schlarb, Ch. Schmidt DESY, Hamburg, Germany R. Rybaniec Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
	The European X-ray free electron laser requires a high-precision control of accelerating fields to ensure a stable photon generation. Its low level radio frequency system, based on the MicroTCA.4 standard, detects the probe, forward and reflected signals for each cavity. While the probe signal is used to control the accelerating fields, a combination of the forward and reflected signals can be used to compute a virtual probe, whose accuracy is comparable to the directly sampled probe. This requires the removal of cross-coupling effects between the forward and reflected signals. This paper presents the precise generation of a virtual probe using an extended method of least squares. The virtual probe can then be used for precise field control in case the probe signal is missing or corrupted. It can also be used to detect any deviation from the nominal probe profile.
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MOPJE028	Detailed Characterization of ALBA Quadrupoles for Beta Function Determination	quadrupole, storage-ring, synchrotron, optics	338
	Z. Martí, J. Campmany, J. Marcos, V. Massana ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain X.N. Gavaldà SOLEIL, Gif-sur-Yvette, France
	Beta function value at quadrupoles for a circular accelerator can be determined using the relationship between the machine tune and the quadrupole strength. ALBA Storage Ring quadrupoles were measured during manufacturing, to be sure that their performance fitted the specifications. However, measurements were done at a number of currents that are not enough for an accurate determination of the beta function value. In fact, at least 1% error in the calibration of the hysteresis curve slope of the quadrupole is required, and therefore new detailed measurements of the hysteresis cycle are needed. In order to make these measurements, spare quadrupoles existing at ALBA have been used. In this paper we present the results of beta function values determination using this method for ALBA storage ring.
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MOPJE047	Chromaticity Dependence of the Transverse Effective Impedance in the CERN Proton Synchrotron	impedance, proton, synchrotron, space-charge	395
	S. Persichelli, N. Biancacci, S.S. Gilardoni, A. Huschauer, E. Métral, B. Salvant, R. Wasef CERN, Geneva, Switzerland M. Migliorati University of Rome La Sapienza, Rome, Italy
	The current knowledge of the transverse impedance of the Proton Synchrotron (PS) has been established with beam-based measurements at different energies. The transverse coherent tune shift as a function of the beam intensity has been measured in order to evaluate the total effective imaginary part of the transverse impedance and its localization in the accelerator at the energies of 2, 7, 13 and 25 GeV. Measurements have been performed changing the chromaticity for every tune shift scan with intensity. The data analysis revealed an increase of impedance with chromaticity for all the energies considered. That transverse impedance can be compared with the previously evaluated theoretical impedance budget taking into account the individual contribution of several machine devices. The missing impedance is finally highlighted.
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MOPJE081	Longitudinal Stability in Multi-Harmonic Accelerating Cavities	cavity, acceleration, accelerating-gradient, cathode	506
	R.M. Jones, L.R. Carver UMAN, Manchester, United Kingdom J.L. Hirshfield Yale University, Physics Department, New Haven, CT, USA Y. Jiang Yale University, Beam Physics Laboratory, New Haven, Connecticut, USA
	Accelerating cavities that excite multiple modes at integer harmonics of the fundamental frequency can potentially be used to limit the effects of rf breakdown and pulsed surface heating at high accelerating gradients. Understanding the longitudinal stability and the acceptance of such a cavity is important to their development and use. The general Hamiltonian for longitudinal stability in multi harmonic cavities is derived and the particle dynamics are explored.
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MOPMA004	Numerical Optimization of Accelerators within oPAC	network, simulation, lattice, quadrupole	533
	C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom C.P. Welsch The University of Liverpool, Liverpool, United Kingdom
	Funding: This project has received funding from the European Union’s Seventh Framework Programme for research, technological development and demonstration under grant agreement no 289485. Powerful simulation tools are required for every accelerator and light source to study the motion of charged particles through electromagnetic fields during the accelerator design process, to optimize the performance of machine diagnostics and to assess beam stability and non-linear effects. The Optimization of Particle Accelerators (oPAC) Project is funded by the EU within the 7th Framework Programme and currently supports 23 Fellows that are based at institutions across Europe. This large network carries out R&D that closely links beam physics studies with the development of diagnostics and beyond state-of-the-art simulation tools. This contribution presents selected research outcomes from oPAC, including the numerical optimization of beam loss monitor locations along the European Spallation Source’s 5 MW proton linac, results from tracking studies for the LHeC lattice that allow beam stability to be assessed, and multi-objective optimization of the linear and non-linear beam dynamics of the synchrotron SOLEIL. In addition, an overview of recent and future oPAC events is also given.
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MOPMA052	Implementation of Quadrupole-scan Emittance Measurement at Fermilab's Advanced Superconducting Test Accelerator (ASTA)	emittance, quadrupole, monitoring, simulation	669
	A.T. Green Northern Illinois Univerity, Dekalb, Illinois, USA Y.-M. Shin Fermilab, Batavia, Illinois, USA Y.-M. Shin Northern Illinois University, DeKalb, Illinois, USA
	Funding: This work was supported by the DOE contract No. DEAC02-07CH11359 to the Fermi Research Alliance LLC. Transverse-emittance measurements based on the quadrupole-scan technique * , have been widely used to characterize the beam phase-space parameters in linear accelerators. This paper discusses the implementation of the technique at the Advanced Superconducting Test Accelerator (ASTA) at Fermilab. We plan on deploying a flexible implementation that permits an operator to select the quadrupole associated analysing screen to measure the beam emittance. Our implementation utilizes Python scripts combined with Fermilab’s control system ACNet and ELEGANT quadrupole-scan method at 50 MeV given the range of operating charge (20 pC to 3.2 nC) available at ASTA. Some preliminary measurements will also be presented. B.E. Carlsten, et al, Nucl. Instrum. Methods Phys. Res. Sect. A 331, 791 (1993) C. Eckman et al, IPAC 2012 * K. Poorrezaei, et al, Phys. Rev. ST-AB 16, 082801 (2013)
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MOPHA002	Operational Applications - a Software Framework Used for the Commissioning of the MedAustron Accelerator	framework, injection, software, operation	773
	A. Wastl, M. Hager, M. Regodic EBG MedAustron, Wr. Neustadt, Austria
	MedAustron is a synchrotron-based cancer therapy and non-clinical research center located in Austria. Its accelerator is currently being commissioned prior to first medical treatment. During the tuning of the machine, many iterations of measurements involving several parameter changes are performed in order to optimize the accelerator’s performance. An operation and measurement software framework called 'Operational Application Framework' (OpApp) has been developed for this purpose. It follows a modular approach and provides basic methods like ‘write to file’ or ‘measure beam position monitor‘. By appropriately combining modules, OpApps performing automatized measurements and complex procedures can be created. A detailed description of the setup as well as examples of use are provided here.
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MOPHA006	A Slow RF-Laser Feedback for PHIL Photoinjector	laser, feedback, gun, electron	784
	N. ElKamchi, V. Chaumat, V. Soskov LAL, Orsay, France
	PHIL is an electron beam accelerator at LAL. It produces low energy (E<5 MeV) and high current (1 nC/bunch) electrons bunch at a repetition frequency of 5Hz. The stability of the beam charge at PHIL is a key issue for the succeful operation of the physic experiences that use the machine. At PHIL, the beam charge is quite stable, but we often note a slow charge drift on long duration experiences. Two ICTs, and a back-end electronics are used to monitor the stability of the beam charge, with an accuracy of about 1pC. Several types of jitter can impact the stability of the beam charge. The fluctuations of the RF power or the RF-laser relative phase drift could have significant influence, due to temperature variations that produce cables dilataion, and electronic components overheating. To correct the phase drift, we describe a method based on a slow analog-digital feedback loop between the RF wave in the gun (3 GHz) and the synchronisation signal of the laser (75MHz). It allows to maintain the jitter between the laser pulse and the RF wave stable at a very low value. As a result, the electron beam charge is maintained at a stable level, to meet the requirements of the users.
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MOPHA008	Investigation of Beam Halo Using In Vacuum Diamond Sensor at ATF2	electron, pick-up, vacuum, laser	791
	S. Liu, P. Bambade, F. Bogard, P. Cornebise, V. Kubytskyi, C. Sylvia LAL, Orsay, France A. Faus-Golfe, N. Fuster-Martínez IFIC, Valencia, Spain T. Tauchi, N. Terunuma KEK, Ibaraki, Japan T. Tauchi, N. Terunuma Sokendai, Ibaraki, Japan
	Funding: Chinese Scholarship Council, CNRS and P2IO LABEX Beam halo transverse distribution measurements are of great importance for the understanding of background sources of the nano-meter beam size monitor at the interaction point (IPBSM) of ATF2. One of the most critical issues for the beam halo measurement is to reach high dynamic range. Two in vacuum diamond sensor beam halo scanners (DSv) with four strips each have been developed for the investigation of beam halo transverse distributions at ATF2. The first DSv was installed for horizontal beam halo scanning after the interaction point (IP) of ATF2, in Nov. 2014. It aims to measure the beam halo distribution with large dynamic range (~10⁶), and investigate the possibility of probing the Compton recoil electrons produced in the interaction with the IPBSM laser beams. Studies to characterize the DS performance and measurements of horizontal beam halo performed in Nov.-Dec. 2014 are presented.
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MOPHA019	Implementation of a High Level Phase Controller for the Superconducting Injector of the S-DALINAC	electron, cavity, EPICS, injection	814
	T. Bahlo, C. Burandt, F. Hug, N. Pietralla TU Darmstadt, Darmstadt, Germany
	Funding: This work has been supported by the DFG through CRC 634 The Superconducting DArmstadt LINear Accelerator S‑DALINAC is a recirculating electron accelerator with a design energy of 130 MeV. It operates in cw-mode at a radio frequency of 3 GHz and provides either unpolarized or polarized electron beams. Before entering the main accelerator the electron beam passes both, a normal-conducting injector beamline for beam preparation and a superconducting 10 MeV injector beamline for preacceleration. The phase of the beam which is injected into the 40 MeV main accelerator is crucial for the efficiency of the acceleration process and the minimization of the energy spread. Due to thermal drifts of the normal-conducting injector cavities this injection phase varies by about 0.2 degree over a timescale of an hour. In order to compensate these drifts, a high level phase controller has been implemented. It adjusts the phase measured at an rf-monitor at the exit of the superconducting injector by changing the phase of a prebuncher in the normal-conducting injector beamline. We will present the used hardware, the control algorithm as well as measurements showing the phase stabilization achieved by this controller.
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MOPHA020	Automated Transverse Beam Emittance Measurement using a Slow Wire Scanner at the S-DALINAC	emittance, quadrupole, electron, EPICS	817
	P. Dijkstal, M. Arnold, C. Burandt, F. Hug, N. Pietralla TU Darmstadt, Darmstadt, Germany
	Funding: This work has been supported by the DFG through CRC 63 and by the EPS-AG through the EPS-AG student grant program. The superconducting linear accelerator S-DALINAC of the TU Darmstadt provides electron beams of up to 130 MeV in cw mode. It consists of a 10 MeV injector and a 40 MeV main linac, both equipped with elliptical cavities operating in liquid helium at 2 K at a frequency of 3 GHz. The final energy is reached by using up to two recirculation paths. In order to improve beam simulations, it is planned to monitor the transverse beam emittance at different locations along the beam line. A system of slow wire scanners in combination with quadrupole variation is foreseen to accomplish this task. For a first test a wire scanner was installed in the 250 keV section behind the thermionic electron gun of the S-DALINAC. A procedure to automatize measurements was developed and integrated in the EPICS-based control system. We will show the status of the work on the automatized control and the results of first emittance measurements. A report on the future plans will be given.
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MOPHA021	Bunch-by-Bunch Longitudinal RF Feedback for Beam Stabilization at FAIR	feedback, LLRF, cavity, synchrotron	820
	K. Groß, H. Klingbeil TEMF, TU Darmstadt, Darmstadt, Germany U. Hartel, H. Klingbeil, U. Laier, D.E.M. Lens, K.-P. Ningel, S. Schäfer, B. Zipfel GSI, Darmstadt, Germany
	Funding: Work supported by the German Federal Ministry of Education and Research (BMBF) under the project 05P12RDRBF. To damp undesired longitudinal oscillations of bunched beams, the main synchrotron SIS100 of FAIR (Facility for Antiproton and Ion Research) will be equipped with a bunch-by-bunch feedback system. This helps to stabilize the beam, to keep longitudinal emittance blow-up low and to minimize beam losses. The proposed LLRF (low level radio frequency) topology of the closed loop feedback system is described. In some aspects, it is similar to the beam phase control system* developed at GSI Helmholtzzentrum für Schwerionenforschung GmbH. The differences and challenges are pointed out, which are mainly the bunch-by-bunch signal processing followed by the generation of a correction voltage in dedicated feedback cavities. The adapted topology was verified at SIS18 during beam time in 2014 using LLRF prototype subsystems and the two existing ferrite-loaded acceleration cavities. The experimental setup to damp coherent longitudinal dipole oscillations is presented and evaluated with focus on the realized modifications, including ongoing and pending investigations. Finally, the current status of the longitudinal feedback system for FAIR is summarized. * Klingbeil et al., IEEE Trans. Nuc. Sci., Vol. 54, No. 6, 2007.
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MOPHA025	Control System for FRANZ Facility	ion, ion-source, proton, neutron	830
	S.M. Alzubaidi, O. Meusel, U. Ratzinger, C. Wagner IAP, Frankfurt am Main, Germany
	The Frankfurt Neutron Source at the Stern- Gerlach Zentrum (FRANZ) will use the reaction of 7Li(p, n)7Be to produce an intense neutron beam. The neutron energy will be between 10 and 500 keV depending on the primary proton beam, which is variable between 1.8 and 2.2 MeV. A volume type ion source will be used to deliver a 120 keV proton beam with currents up to 200 mA. Like any other facility, FRANZ will need a powerful and reliable control system that also allows monitoring the whole accelerator target areas and experiments. Also interlock and safety systems have to be included to protect personnel from radiation hazards associated with accelerator operations and accompanying experiments. The FRANZ control system is still under development. The ion source will be the first element to be controlled, and to gain experience. A test ion source will be used for testing and examining the performance of this control system. In this paper, the plasma properties, filament ageing and an internal control loop for stable beam production with respect to controlling issues will be discussed.
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MOPHA030	Commissioning of the Low-Noise MTCA.4-based Local Oscillator and Clock Generation Module	hardware, shielding, monitoring, distributed	847
	U. Mavrič, J. Branlard, M. Hoffmann, F. Ludwig, H. Schlarb DESY, Hamburg, Germany D.R. Makowski, A. Mielczarek, P. Perek TUL-DMCS, Łódź, Poland A. Rohlev Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	Funding: Helmholtz Validation Fund Project "MicroTCA.4 for Industry" Within the Helmholtz Validation Fund Project "MicroTCA.4 for Industry", DESY together with collaboration partners from industry and research developed a compact fully MicroTCA chassis-integrated local RF oscillator module. The local oscillator and clock generation module generates a low noise local oscillator out of the global reference that is distributed over the accelerator. The module includes a splitting section which provides 9 local oscillator signals which are distributed over the RF-Backplane to the rear-transition modules. Similarly, the clock signal is also generated out of a single reference input by means of low-noise dividers. The clock is then fan-out to 22 differential lines that are routed over the RF backplane to the rear-transition modules. The functional block is implemented such that it fits in the rear slots 15 and 14 of a standard MTCA.4 crate. In the paper the commissioning results measured on the L3 low-level RF stations of the European XFEL will be presented.
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MOPHA031	Implementation of a Diagnostic Pulse for Beam Optics Stability Measurements at FLASH	kicker, optics, diagnostics, betatron	850
	F. Mayet, R.W. Aßmann, S. Schreiber, M. Vogt DESY, Hamburg, Germany
	In order to monitor long-term stability of beam optics, simple and at the same time minimally invasive procedures are desirable. Using selectively kicked bunches, betatron phase advance, as well as potential growth of the betatron oscillation amplitude and the Twiss parameters alpha and beta can be extracted from BPM data. If done periodically, this data can be compiled into a long-term history that is accessible via the control system. This way it is possible to identify potential sources of beam optics errors. At FLASH the procedure could be implemented as a server/client tool. Since the whole procedure takes less than five seconds, operation is not disturbed significantly. In this work the possible implementation of the procedure is presented. It is also shown how the history data can be evaluated in order to infer possible beam optics error sources.
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MOPHA032	All-Optical Synchronization of Pulsed Laser Systems at FLASH and XFEL	laser, timing, LLRF, FEL	854
	J.M. Müller, M.K. Czwalinna, M. Felber, M. Schäfer, H. Schlarb, B. Schmidt, S. Schulz, C. Sydlo, F. Zummack DESY, Hamburg, Germany
	The all-optical laser synchronization at FLASH and XFEL provides femtosecond-stable timing of the FEL X-ray photon pulses and associated optical laser pulses (photo-injector laser, seed laser, pump-probe laser, etc.). Based on a two-color balanced optical cross-correlation scheme a high-precision measure of the laser pulse arrival time is delivered, which is used for diagnostic purposes as well as for the active stabilization of the laser systems. In this paper, we present the latest installations of our all-optical synchronization systems at FLASH and the recent developments for the upcoming European XFEL that will ensure a reliable femtosecond-stable timing of FEL and related pulsed laser systems.
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MOPHA044	Testing a Digital Beam Position Stabilization for the P2-experiment at MESA	experiment, FPGA, feedback, electron	888
	M. Dehn, K. Aulenbacher, J. Diefenbach, F. Fichtner, R. Herbertz, W. Klag IKP, Mainz, Germany
	Funding: Work supported by the German Federal Ministry of Education and Research (BMBF) and German Research Foundation (DFG) under the Collaborative Research Center 1044 and the Cluster of Excellence "PRISMA" The Mainz Energy recovering Superconducting Accelerator (MESA) will be built at the institute for nuclear physics at Mainz University. Besides the multi-turn energy recovery mode an external beam mode is foreseen to provide 155 MeV electrons of 85% polarization at 150 μA for parity violating experiments. To achieve the required stability of the main beam parameters a dedicated digital position stabilization is currently developed and tested at the Mainz Microtron (MAMI).
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MOPHA045	Developments and Performance of the LLRF System of the S-Band FERMI Linac	LLRF, klystron, cavity, feedback	891
	A. Fabris, F. Gelmetti, M. Milloch, M. Predonzani Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	The requirements on beam quality on the FERMI Free Electron Laser (FEL) linac impose challenging specifications on the stability of the RF fields that can only be met by using high reliable and high performance state of the art LLRF systems. The system installed in FERMI has met these requirements and is routinely operational for the machine on a 24/7 basis. The completion of the deployment of the LLRF units in 2015 increases the capabilities of the system, adding further measurement channels and monitoring, and allowing new functionalities. This paper provides an overview of the results achieved with the LLRF system of FERMI and an outlook of the further developments that are being implemented or planned.
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MOPHA046	!CHAOS Status and Evolution	framework, interface, distributed, database	894
	G. Mazzitelli, C. Bisegni, S. Caschera, G. Di Pirro, L.G. Foggetta, R. Gargana, E. Gioscio, D. Maselli, A. Michelotti, R. Orrù, S. Pioli, F. Spagnoli, A. Stecchi, M. Tota INFN/LNF, Frascati (Roma), Italy D.G.C. Di Giulio INFN-Roma II, Roma, Italy
	A synthesis of the “!CHAOS: a cloud of controls” project and its application to accelerators and large experiments will be presented. We will describe here how the !CHAOS project has evolved from a candidate for the SuperB accelerator control system to a facility for IT distributed infrastructures. !CHAOS is currently, not only suitable for accelerators and large High Energy Physics (HEP) experiments, but is also applicable to other contexts, such as social and industrial applications. Preliminary results achieved on an accelerator use case are discussed.
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MOPHA047	RF System Design for the TOP-IMPLART Accelerator	LLRF, proton, klystron, linac	897
	V. Surrenti, G. Bazzano, P. Nenzi, L. Picardi, C. Ronsivalle ENEA C.R. Frascati, Frascati (Roma), Italy F. Ambrosini Università di Roma "La Sapienza", SAPIENZA-DIET, Roma, Italy
	In the ENEA-Frascati research center a linear accelerator for proton therapy is under development in the framework of TOP-IMPLART Project carried out by ENEA in collaboration with ISS and IRE-IFO. The machine is based on a 7 MeV injector operating at a frequency of 425 MHz followed by a sequence of 2997.92 MHz accelerating modules. Five 10 MW klystrons will be used to power all high frequency structures up to a beam energy of 150 MeV. The maximum repetition frequency is 100 Hz and the pulse duration is 4 μs. The RF amplitude and phase stability requirements of the accelerating field are within ±2% and ±2 degrees respectively. For therapeutic use the beam energy will be varied between 85 and 150 MeV by switching off the last modules and varying the electric field amplitude in the last module switched on. Fast control of the RF power supplied to the individual structures allows an energy variation on a pulse by pulse basis; furthermore the system must be able to control the RF phase between accelerating structures. This work describes the RF power distribution scheme and the RF phase and amplitude monitoring system implemented into an embedded control system.
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MOPHA049	Evolution of Diagnostics and Services of the DAΦNE Beam Test Facility	vacuum, detector, linac, diagnostics	904
	L.G. Foggetta, B. Buonomo INFN/LNF, Frascati (Roma), Italy P. Valente INFN-Roma, Roma, Italy
	The DAΦNE Beam Test Facility (BTF) is operational in Frascati since 2003. In the last years the beam diagnostics tools have been completely renewed and the services for users have been largely improved. We describe here the new transverse beam diagnostics based on new GEM TPC detectors and Timepix/FitPix, the new BTF network layout, the renewed DAQ system including the BCM detectors, the data caching system based on MEMCached and the integration of the new sub-systems in the new data-logging. All other services, such as the environmental monitoring system, vacuum system, payload remote handling, and gas distribution have been also improved.
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MOPHA056	Status of LLRF Control System for SuperKEKB Commissioning	cavity, LLRF, beam-loading, klystron	924
	T. Kobayashi, K. Akai, K. Ebihara, A. Kabe, K. Nakanishi, M. Nishiwaki, J.-I. Odagiri KEK, Ibaraki, Japan H. Deguchi, K. Hayashi, T. Iwaki, M. Ryoshi Mitsubishi Electric TOKKI Systems, Amagasaki, Hyogo, Japan
	Beam commissioning of the SuperKEKB will be started in JFY2015. A new LLRF control system, which is an FPGA-based digital RF feedback control system on the MicroTCA platform, has been developed for high current beam operation of the SuperKEKB. The mass production and installation of the new systems has been completed as scheduled. The new LLRF control systems are applied to nine RF stations (klystron driving units) among existing thirty stations. As a new function, klystron phase lock loop was digitally implemented within the cavity FB control loop in the FPGA, and in the high power test it worked successfully to compensate for the klystron phase change. Beam loading was also simulated in the high power test by using an ARES cavity simulator, and then good performance in the cavity-voltage feedback control and the cavity tuning control was demonstrated to compensate the large beam loading for the SuperKEKB parameters. Fabrication of another new LLRF control system for damping ring which is required for low-emittance positron injection is scheduled in JFY2015.
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MOPHA059	Control System Upgrade for SuperKEKB Injector Linac	linac, operation, EPICS, Linux	930
	M. Satoh, K. Furukawa, K. Mikawa, F. Miyahara, Y. Seimiya, T. Suwada KEK, Ibaraki, Japan T. Kudou, S. Kusano Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan H.S. Saotome, M. Takagi Kanto Information Service (KIS), Accelerator Group, Ibaraki, Japan
	Toward SuperKEKB project, the electron/positron injector linac upgrade is ongoing at KEK in order to deliver the low emittance electron/positron beams with high bunched charge intensity and small emittance. A large number of accelerator components and control devices will be newly installed before the autumn of 2014. Finally, we are aiming at the simultaneous top-up operation for the four independent storage rings including two light sources. The high availability and reliability of control system is strongly required for the long-term stable beam operation under such complex operation schemes. In this presentation, we will describe the control system upgrade plan and status.
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MOPHA060	Feasibility Study on Measurement and Control of Relative Positioning for Nano-beam Collision	laser, alignment, acceleration, superconducting-magnet	933
	H. Matsunaga, H. Yoshioka Takenaka Corporation, Institute of Technology, Chiba, Japan M. Masuzawa, Y. Ohsawa, R. Sugahara, H. Yamaoka KEK, Ibaraki, Japan
	In the SuperKEKB and future International Linear Collider project, it is required to measure and control an offset of very small beams with a precision of several nanometers at the interaction point. This paper is a feasibility study on measuring and controlling nano-order relative position by using a laser interferometer and a piezoelectric stage. The first part shows that the precision of measurement position about a direction of laser radiation is less than or equal to 1 nanometer in frequency region less than 100Hz. The second part is discussed a measurement of relative displacement between two points which are 10 meter away on substructures located at the interaction point in the SuperKEKB. To compare with difference of accelerometers for reference, a relative displacement measurement with a precision of several nanometers by a laser interferometer became clear. The final part is discussed a relative positioning control by using a Piezo-Stage between two points on active vibration isolation tables. We achieved to control a relative displacement below 2 nanometers in frequency region less than 10Hz.
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MOPTY006	Study on the Injection Beam Commissioning Software for CSNS/RCS	injection, software, interface, linac	950
	M.Y. Huang, L. Huang, W.B. Liu, J. Qiu, S. Wang IHEP, Beijing, People's Republic of China
	Funding: Funding Agency: Work supported by National Natural Science Foundation of China (11205185, 11175020, 11175193 ) The China Spallation Neutron Source (CSNS) accelerator uses H⁻ stripping and phase space painting method of filling large ring acceptance with the linac beam of small emittance. The beam commissioning software system is the key part of CSNS accelerator. The injection beam commissioning software for CSNS contains three parts currently: painting curve control, injection beam control and injection orbit correction. The injection beam control contains two subsections: single bunch beam calculation and LRBT beam control at the foil. The injection orbit correction also contains two subsections: injection orbit correction by the calculation and injection trim power control.
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MOPTY012	Design and Test of Prototype of LLRF System for KIPT Neutron Source LINAC	LLRF, linac, EPICS, FPGA	959
	X.P. Ma, Y.L. Chi, R.L. Liu IHEP, Beijing, People's Republic of China S. Shu Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing, People's Republic of China
	A 100 MeV/100 kW electron LINAC is being constructed by IHEP, China for the NSC KIPT Neutron Source project in Ukraine. A LLRF system is required to produce the driver RF input of the klystron and maintain the accelerating phase and amplitude stability of the machine. The LLRF system consists of an RF reference distribution system, six identical control units, and the fast RF interlock module. The main part of control unit is the PXI-bus crate implemented with PXI9846 - 4 ADC digitizer board and ICS572 - high speed 2 ADC/2 DAC signal process board. An EPICS IOC based on WinDriver as the PCI device driver is developed and tested. Preliminary results show phase detect resolution of 0.03 degree (rms) of 2856 MHz signal has been achieved. *Mail Address: maxp@ihep.ac.cn
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MOPTY013	Control System for DC-SRF Photo-Injector at Peking University	laser, SRF, LLRF, cryomodule	962
	L.W. Feng, J.K. Hao, S. Huang, L. Lin, K.X. Liu, S.W. Quan, F. Wang, B.C. Zhang PKU, Beijing, People's Republic of China
	A control system has been designed and constructed to full-fill the operation requirement of the DC-SRF photo injector developed at Peking University. The system includes FPGA based low level radio frequency (LLRF) control system, PLC based machine protection system, VME based magnet power control, and PC based EPICS IOC. All these systems were integrated to support the stable operation of the DC-SRF photo injector and has shown their robustness. The LLRF system was optimized and tuned for 2K CW/Pulse operation and the stability of amplitude and phase achieves 0.1% and 0.1° respectively.
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MOPTY015	Beam Compression Dynamics and Associated Measurement Methods in Superconducting THz Source	simulation, space-charge, gun, electron	969
	Z. Zhou, Y.-C. Du, W.-H. Huang TUB, Beijing, People's Republic of China
	To ensure the quality of high brightness electron beams needed by the terahertz FEL facility at China academy of engineering physics(CAEP), which aims to obtain 100 to 300 terahertz light, a feed-back control system is required to monitor the amplitude and phase jittering by measuring beam arrival time as well as bunch length at the site of the beam position monitor(BPM). In this paper, we make an idealized model of injector section and deduce analytic expressions of bunch arrival time and bunch length. In consideration of the space charge effect on bunch lengthening, bunch arrival time and bunch length as a function of DC gun voltage, buncher field amplitude and buncher phase is carefully calibrated by means of particle in cell (PIC) simulation. With the time and space resolution of the BPM, the control accuracy of phase is estimated to be 0.01 degree, while the amplitude is 0.04%.
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MOPTY038	NSLS-II Digital RF Controller Logic and Applications	cavity, EPICS, FPGA, feedback	1010
	B. Holub, F. Gao, J.G. Kulpin, C. Marques, J. Oliva, J. Rose, N.A. Towne BNL, Upton, New York, USA
	The National Synchrotron Light Source II accelerator consists of the Storage Ring, the Booster Ring, and Linac along with their associated cavities. NSLS II is committed to the use of digital RF controllers for controlling these cavities. Given the number, types and variety of functions of these cavities, we sought to limit the logic development effort by reuse of parameterized code on one hardware platform. Currently we have fielded six controllers in the NSLS II system. There are two controllers each in both the Storage ring and Booster. The first controller in each is used to control the cavity field and the second controller used for diagnostics. In the Linac a controller is provided which modulates the eGUN grid to generate the bunches. Lastly, in the Master Oscillator Distribution System a controller is used to make phase corrections to the outgoing master oscillator clock signal to account for thermal phase drifts along the distribution path.
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MOPTY039	Compact Single Pass BPM	software, FPGA, instrumentation, pick-up	1013
	M. Žnidarčič, M. Cargnelutti, E. Janezic I-Tech, Solkan, Slovenia
	Monitoring and subsequent optimization of linacs and beam transfers requires specific instrumentation for beam position data acquisition and processing. Compact single pass BPM is the newly developed prototype intended for position and charge monitoring in classical single-multi bunch operation linacs and transfer lines. Flexibility of the instrument enables the installation on electron and proton single pass machines. The motivation, processing principles and first results are presented.
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MOPTY040	Hadron BPM for the FAIR Project	hadron, instrumentation, interface, diagnostics	1016
	M. Žnidarčič, E. Janezic, P. Leban I-Tech, Solkan, Slovenia K. Lang GSI, Darmstadt, Germany
	The accelerators of the Facility for Anti-proton and Ion Research are designed to deliver stable and rare isotope beams covering a huge range of intensities and beam energies. FAIR will employ heavy ion synchrotrons for highest intensities, anti-proton and rare isotope production stations, high resolution separators and several storage rings where beam cooling can be applied. Instrumentation Technologies will develop and deliver a beam diagnostic system for SIS100, HESR and CR rings. Furthermore the beam transfers will be equipped with the beam position diagnostics. The project is on schedule and the first instrument prototypes are already being under evaluation. This article discusses the new BPM electronics concept, the tests performed in the laboratory and the performance obtained.
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MOPTY043	Update on the Development of the New Electronic Instrumentation for the LIPAc/IFMIF Beam Position Monitors	timing, electronics, operation, EPICS	1025
	A. Guirao, D. Jiménez-Rey, L.M. Martinez Fresno, E. Molina Marinas, J. Mollá, I. Podadera, I. Rivera CIEMAT, Madrid, Spain
	Funding: This work has been funded by the Spanish Ministry of Economy and Competitiveness under the project FIS2013-40860-R and the Agreement as published in BOE, 16/01/2013, page 1988 Among all the LIPAc/IFMIF accelerator diagnostics instrumentation, the Beam Position Monitors (BPMs) are a cornerstone for its operation. An electronics system centered on self-calibration and extraction of beam phase information for Time Of Flight measurement is proposed for the twenty BPM stations distributed along the accelerator. The system under development is a fully digital instrumentation which incorporates automatic calibration of the monitors' signals and allows monitoring of both fundamental and second signal harmonics. The current state of the development and first experimental results of the system on the test bench will be presented.
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MOPTY046	Personnel Safety Systems for the European Spallation Source	radiation, PLC, target, neutron	1036
	S.L. Birch, A. Nordt, D. Paulic ESS, Lund, Sweden
	Providing and assuring safe conditions for personnel is a key parameter required to operate the European Spallation Source (ESS). The ESS will be responsible for developing all of the facility personnel safety related systems. All of these systems will be developed by the Integrated Control Systems Division (ICS) and all will be designed, manufactured, commissioned and operated in accordance with the IEC61508 standard, with regard to functional safety for Electrical/Electronic and Programmable Electronic (E/E/PE) safety related systems. This paper describes the ESS Personnel safety system’s scope, strategy, initial design requirements, and methodology but also provides an update of the system design progress so far.
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MOPTY048	Machine Protection Strategy for the ESS	operation, neutron, proton, target	1042
	A. Nordt, T. Friedrich, T. Korhonen ESS, Lund, Sweden C. Hilbes ZHAW, Winterthur, Switzerland
	The ESS proton beam power of 125MW per pulse (5MW average) will be unprecedented and its uncontrolled release could lead to serious damage of equipment within a few microseconds only. To optimize the operational efficiency of the ESS facility allowing for very high beam availability with high reliability towards the end-users, accidents should be avoided and interruptions of beam operation have to be rare and limited to a short time. Finding the right balance between efficient protection of equipment from damage and high beam availability is the key idea on which the ESS Machine Protection Strategy is being based on. Implementing and realizing the measures needed to provide the correct level of machine protection in case of a complex facility like the ESS, requires a systematic approach, which will be discussed in this paper. A method of how to derive machine protection relevant requirements and how to assure completeness of these will be outlined as well.
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MOPTY060	Pulse Compressor Phase and Amplitude Modulation Based on Iterative Learning Control	klystron, operation, linac, experiment	1076
	A. Řežaeizadeh, R. Kalt, T. Schilcher PSI, Villigen PSI, Switzerland R. Smith Automatic Control Laboratory, ETH Zurich, Zurich, Switzerland
	This paper presents an alternative way to produce flat-topped RF pulses at the pulse compressor output. Flat-topped RF pulses are suitable for multi-bunch operation where it is often required that beams experience the same accelerating gradient. Moreover, the energy gain, in this case, is less sensitive to timing jitters. The proposed approach is based on Iterative Learning Control technique, which iteratively updates the input waveforms, in order to generate the desired output waveforms.
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MOPTY061	Beam-Based Power Distribution Over Multiple Klystrons in a Linear Accelerator	klystron, high-voltage, linac, LLRF	1079
	A. Řežaeizadeh, R. Kalt, T. Schilcher PSI, Villigen PSI, Switzerland R. Smith Automatic Control Laboratory, ETH Zurich, Zurich, Switzerland
	A linear accelerator including several klystron driver RF stations can be viewed as a single virtual RF station with a certain accelerating RF voltage (in amplitude and phase). This paper develops an optimization scheme that, for a specified beam energy gain, determines the klystrons output powers and the modulators high voltages optimally. The algorithm employs the klystron nonlinear static characteristics curves to calculate the input RF amplitude of the drive chain. A. Řežaeizadeh, et al, Model-based klystron linearization in the SwissFEL test facility, 36th International Free Electron Laser Conference, Basel, Switzerland
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MOPTY062	The Energy Saving Processes for Utility System in TPS	experiment, operation, photon, factory	1082
	C.S. Chen, W.S. Chan, J.-C. Chang, Y.C. Chang, Y.-C. Chung, C.W. Hsu, C.Y. Liu, Z.-D. Tsai NSRRC, Hsinchu, Taiwan
	There are more and more non-linear electronic equipments such as inverters using in facility nowadays. These non-linear electronic equipments let us achieve energy saving, but induce other electrical pollution to the whole power grid in contrast. Among these electrical pollutions, electric harmonic is the most common and harmful to power facility. Therefore, how to monitor the electrical noises from these non-linear equipments becomes an important issue. In this article, a set of power quality monitoring system based on FPGA (Field-Programmable Gate Arrays) modules and PAC (Programmable Automatic Controller) has been built because of their programmability and fast processing speed. By using this monitoring system, any abnormality in power system and its spectrum will be recorded thoroughly. On the other hand, the maintainer could follow the trace of noise and then propose a suitable solution to eliminate the electrical interference too.
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MOPTY063	The Flexible Customized Supervisor and Control System for Utility in TPS	network, operation, monitoring, vacuum	1085
	C.S. Chen, W.S. Chan, J.-C. Chang, Y.C. Chang, Y.-C. Chung, C.W. Hsu, C.Y. Liu, Z.-D. Tsai NSRRC, Hsinchu, Taiwan
	In order to maintain and operate a synchrotron radiation light source well requires quite a few efforts. All parts of the big machine, including vacuum system, all kinds of magnets, RF facility, cryogenic equipments, radiation security, optic devices and utility equipment must cooperate in harmony to provide high quality light. Any one of the above system contains lots of analog or digital signal transmission, not to mention the vast range of utility. Numbers of programmable automation controllers (PACs) are applied in utility system in TPS to ensure the utility operates normally. In addition to the high reliability and distribution, the flexible programmability of PAC is the most critical feature in this project. A well-designed program, Archive Viewer, provides a platform for showing these big data from all distributed systems. The architecture of the server system for utility is described in this paper as well.
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MOPTY064	Compensation Strategies for Ramping Waveform of TPS Booster Synchrotron Main Power Supplies	power-supply, dipole, booster, quadrupole	1088
	P.C. Chiu, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, K.-B. Liu, B.S. Wang, C.Y. Wu NSRRC, Hsinchu, Taiwan
	Booster synchrotron for the Taiwan photon source project which is a 3 GeV synchrotron light source constructed at NSRRC is in commissioning. The booster is designed to ramp electron beams from 150 MeV to 3 GeV in 3 Hz therefore the large main power supplies have features of waveform play with trigger functionalities to enable electron beams ramp from 150 MeV to 3 GeV in 3 Hz. However, due to limited bandwidth of power supplies, different magnet loading will result in quite different phase lag for dipoles and four quadrupoles families. To improve tracking error between quadrupole to dipole readings, several strategies are developed and will be summarized in this report.
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MOPTY069	Control Interface and Functionality of TPS Booster Power Supply	power-supply, booster, dipole, quadrupole	1094
	C.Y. Wu, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Huang, D. Lee, C.Y. Liao NSRRC, Hsinchu, Taiwan
	The TPS booster is a synchrotron with injection energy at 150 MeV and extraction energy at 3 GeV in 3 Hz. Booster main power supplies consist of one dipole power supply with maximum current 1200 Ampere and four quadrupole family power supplies with maximum current of 120/150 Ampere. The small power supply for booster corrector and sextupole is a low noise switching power supply with ± 10 Ampere current range. The TPS booster control environment is based on EPICS framework to support rich functionalities including power supply control, waveform management, operation supports, and so on. All power supplies support DC mode and 3 Hz ramping mode operation for TPS booster commissioning and operation. Efforts on control interface and functionality for TPS booster power supply will be summarizes.
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MOPTY070	Online RadFET Reader for Beam Loss Monitoring System	EPICS, network, interface, radiation	1097
	C.H. Huang, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, D. Lee, C.Y. Wu NSRRC, Hsinchu, Taiwan
	To investigate the beam loss and its distribution during operation of synchrotron light sources at NSSRC, a sixteen-channel readout box is designed and implemented to read the threshold voltage of the RadFETs installed at accelerator tunnel. To simplify the design, the reader plays a role of remote I/O for EPICS IOC. The IOC collects voltage from readers distributed in the accelerator to deduce the integrated dose and dose rate. User interface is shown in the control console for real-time display and the archived data are processed off-line.
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MOPTY071	FPGA Based Global Orbit Feedback in the Taiwan Light Source	feedback, FPGA, interface, brilliance	1100
	C.H. Kuo, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, D. Lee NSRRC, Hsinchu, Taiwan
	The global orbit feedback for the 1.5 GeV electron storage ring of TLS has been operated more than ten years. This system uses general processors to control feedback loop with 1 kHz rate. It is very important for various operation of storage ring now, but some hardware components could have been out of stock in the future. As a prototype, a FPGA based fast global orbit feedback at a 10 kHz data acquisition rate has been developed. A micro-TCA liked platform with FPGA board is used to implement control algorithm and acquire BPM data from Libera Brillance. The correction algorithm is written in VHDL and connected to power supply with AURORA digital links. The system architecture will be discussed in this report.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPTY071
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MOPTY072	Beam Loss Study of TLS Using RadFETs	injection, radiation, storage-ring, booster	1103
	C.H. Huang, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, D. Lee, C.Y. Wu NSRRC, Hsinchu, Taiwan
	To realize the beam loss during the operation of Taiwan light source, P-type radiation-sensing field-effect transistors are setup around the storage ring. A sixteen-channel readout box is used to read the threshold voltage of the radiation-sensing field-effect transistors during irradiation. The beam loss distribution and mechanism at the injection period, decay mode and top up injection for routing operation will be studied in this report.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPTY072
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MOPTY076	Development of EPICS Applications for the Taiwan Light Source	EPICS, interface, GUI, framework	1116
	Y.-S. Cheng, J. Chen, P.C. Chiu, K.T. Hsu, C.H. Huang, C.Y. Liao NSRRC, Hsinchu, Taiwan
	The TLS (Taiwan Light Source) is a third generation of synchrotron light source, and it has been operated since 1993. The TLS control system is a proprietary design. It was performed minor upgrade several times to avoid obsolete of some system components and keep up-to-date during last two decades. The control system of the TPS project (Taiwan Photon Source) is based upon the EPICS framework. To save resources for TLS control system maintenance, adopt EPICS for newly developed and rejuvenated subsystems for some of the TLS control interfaces includes BPM system, insertion devices, bunch-by-bunch feedbacks, electronics instruments interface and so on. Some EPICS related applications have been developed, and EPICS graphical user interface is also operated at the TLS control consoles environment normally. Current system allowed two kinds of control environments working together. The efforts will be described at this report.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPTY076
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MOPTY077	Control Interface of Pulse Magnet Power Supply for TPS Project	EPICS, kicker, power-supply, injection	1120
	C.Y. Wu, J. Chen, Y.-S. Cheng, C.-S. Fann, K.T. Hsu, S.Y. Hsu, K.H. Hu, C.H. Huang, D. Lee, C.Y. Liao, K.-K. Lin NSRRC, Hsinchu, Taiwan
	The TPS (Taiwan Photon Source) is low emittance 3 GeV synchrotron light source. The design and implementation of a pulse magnet power supply control system for beam injection and extraction were done. The EPICS embedded programmable logic controller (PLC) was applied to control pulse magnet power supply. The system comprises various input/output modules and a CPU module with built-in Ethernet interface. The control information (status of the power supply, ON, OFF, warn up, reset, reading/setting voltage, etc.) can be accessed remotely using EPICS client tools. The TPS timing system provide trigger signals for pulse magnet power supplies. The Ethernet-based oscilloscope is employed to observe current waveform of pulse magnet power supply with EPICS support. This paper describes control interface and operation GUI for the TPS pulse magnet power supply.
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MOPWI011	Beam Stability R&D for the APS MBA Upgrade	feedback, diagnostics, insertion, insertion-device	1167
	N. Sereno, N.D. Arnold, H. Bui, J. Carwardine, G. Decker, L. Emery, R.I. Farnsworth, R.T. Keane, F. Lenkszus, R.M. Lill, R. Lipa, S. Veseli, S. Xu, B.X. Yang ANL, Argonne, Ilinois, USA
	Funding: Results shown in this report result from work performed at Argonne National Laboratory operated by UChicago Argonne, LLC, for the U.S. Department of Energy under contract DE-AC02-06CH11357. Beam diagnostics required for the APS MBA are driven by ambitious beam stability requirements. The major AC stability challenge is to correct rms beam motion to 10% the rms beam size at the insertion device source points from 0.01 to 1000 Hz. The vertical plane represents the biggest challenge for AC stability which is required to be 400 nm rms for a 4 micron vertical beam size. Long term drift over a period of 7 days is required to be 1 micron or less. Major diagnostics R&D components are improved rf beam position processing using commercially available fpga based bpm processors, new XRay beam position monitors sensitive only to hard X-rays, mechanical motion sensing and remediation to detect and correct long term drift and a new feedback system featuring a tenfold increase in sampling rate and a several-fold increase in the number of fast correctors and bpms. Feedback system development represents a major effort and we are pursuing development of a novel algorithm that integrates orbit correction for both slow and fast correctors down to DC simultaneously. Finally a new data acquisition system (DAQ) is being developed to acquire streaming data from all diagnostics.
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MOPWI013	Control System for the LCLS-II Undulator Prototype	undulator, interface, FPGA, monitoring	1173
	J.Z. Xu, R.I. Farnsworth, N.O. Strelnikov, I. Vasserman ANL, Argonne, Ilinois, USA
	Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357 The Linac Coherent Light Source (LCLS) has been successfully operated for more than 6 years. In order to expand the capability and capacity of the LCLS, LCLS-II has been planned and funded by the Department of Energy. The Advanced Photon Source (APS) at Argonne National Laboratory is tasked with building the prototype of the LCLS-II undulator based on the concept of magnetic force dynamic compensation. The control system for the prototype is responsible for four motion and feedback channels with sub-micron-level accuracy, eight load cells that monitor the forces that act on the system in real time, and multiple temperature sensors. A detailed description of the control system and its operation is reported.
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MOPWI021	The LCLS-II LLRF System	cavity, LLRF, cryomodule, linac	1195
	C. Hovater, R. Bachimanchi JLab, Newport News, Virginia, USA S. Babel, B. Hong, D. Van Winkle SLAC, Menlo Park, California, USA B.E. Chase, E. Cullerton, P. Varghese Fermilab, Batavia, Illinois, USA L.R. Doolittle, G. Huang, A. Ratti, C. Serrano LBNL, Berkeley, California, USA
	Funding: This work was supported by the LCLS-II Project and the U.S. Department of Energy, Contract DE-AC02-76SF00515. The SLAC National Accelerator Laboratory is planning an upgrade (LCLS-II) to the Linear Coherent Light Source with a 4 GeV CW superconducting (SCRF) linac. The SCRF linac consists of 35 ILC style cryomodules (eight cavities each) for a total of 280 cavities. Expected cavity gradients are 16 MV/m with a loaded QL of ~ 4x10⁷. The RF system will have 3.8 kW solid state amplifiers driving single cavities. To ensure optimum field stability a single source single cavity control system has been chosen. It consists of a precision four channel cavity receiver and RF stations (Forward, Reflected and Drive signals). In order to regulate the resonant frequency variations of the cavities due to He pressure, the tuning of each cavity is controlled by a Piezo actuator and a slow stepper motor. In addition the system (LLRF-amplifier-cavity) is being modeled and cavity microphonic testing has started. This paper describes the LLRF system under consideration, including recent modeling and cavity tests.
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MOPWI027	Open XAL Control Room Experience	software, optics, operation, Windows	1214
	C.P. Chu, D.G. Maxwell, Y. Zhang FRIB, East Lansing, Michigan, USA C.K. Allen, T.A. Pelaia II, A.P. Shishlo ORNL, Oak Ridge, Tennessee, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy under Cooperative Agreement DE-SC0000661 and DE-AC05-00OR22725, the State of Michigan and Michigan State University. This paper reports the control room experience, lessons learned, and quick deployment approach for the Open XAL application environment. Open XAL is a java-based framework for building high-level accelerator applications, it is a major revision of the XAL framework which was developed at the Spallation Neutron Source (SNS). Open XAL is site neutral and may be deployed at multiple accelerator facilities. Currently, Open XAL is installed at SNS and at the Re-Accelerator facility of Michigan State University. At SNS we are in the final process of replacing the old XAL environment with Open XAL; we describe the upgrade process and our accelerator operations experience using Open XAL. At Michigan State, Open XAL has been tested during a cryomodule commissioning and result will be shown.
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MOPWI028	Initial Experimental Results of a Machine Learning-Based Temperature Control System for an RF Gun	gun, cavity, monitoring, network	1217
	A.L. Edelen, S. Biedron, S.V. Milton CSU, Fort Collins, Colorado, USA B.E. Chase, D.J. Crawford, N. Eddy, D.R. Edstrom, E.R. Harms, J. Ruan, J.K. Santucci, P. Stabile Fermilab, Batavia, Illinois, USA
	Colorado State University (CSU) and Fermi National Accelerator Laboratory (Fermilab) have been developing a control system to regulate the resonant frequency of an RF electron gun. As part of this effort, we present experimental results for a benchmark temperature controller that combines a machine learning-based model and a predictive control algorithm for improved settling time, overshoot, and disturbance rejection relative to conventional techniques. Such improvements have implications for machine up-time and management of reflected power. This work is part of an on-going effort to develop adaptive, machine learning-based tools specifically to address control challenges found in particle accelerator systems.
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MOPWI034	Adaptive Accelerator Tuning	DTL, feedback, hardware, simulation	1237
	A. Scheinker LANL, Los Alamos, New Mexico, USA
	We start with an overview of advanced adaptive control schemes in use throughout the accelerator community. We then present a recently developed, novel, model-independent feedback controller, which is robust to measurement noise, and able to tune an arbitrary number of coupled parameters simultaneously based only on a user-defined cost function. We discuss the possibility of combining virtual beam measurements from simulations with actual diagnostic signals from the accelerator into a single cost function, which takes into account both unknown machine variations and estimates of physically inaccessible beam characteristics. We present recent in-hardware experimental results obtained at the Los Alamos Neutron Science Center* and at the Facility for Advanced Accelerator Tests (FACET)**, demonstrating the scheme’s ability to simultaneously tune many parameters and its robustness to noise and system time-variation. A. Scheinker et al., PRSTAB, 16, 102803, 2013. A. Scheinker et al., NIMA, 756, pp. 30-38, 2014. * A. Scheinker and S. Gessner, Conference on Decision and Control, 2014.
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MOPWI037	Upgrade and Operation of the Demonstration 4 GS/Sec. Intra-Bunch Instability Control System for the SPS	feedback, kicker, pick-up, FPGA	1246
	J.E. Dusatko, J.D. Fox, C.H. Rivetta, O. Turgut SLAC, Menlo Park, California, USA W. Höfle CERN, Geneva, Switzerland
	Funding: Work supported by the U.S. Department of Energy under contract # DE-AC02-76SF00515 and the US LHC Accelerator Research Program (LARP). We present the expanded system implementation and operational experience details for the “Demo” technology platform commissioned at the SPS in January 2015. The system has been expanded during the LS1 shutdown with added features. The upgraded system has enhanced performance and more robust synchronization to the beam and accelerator timing system. Central to the new features are 1 GHz bandwidth kickers and RF amplifiers (including associated equalizers) which allow excitation and control of higher modes within the 2 ns bunch. We highlight the expanded features, and present their details.
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MOPWI041	Identification of Intra-Bunch Transverse Dynamics for Model Based Wideband Feedback Control at CERN Super Proton Synchrotron	feedback, simulation, proton, synchrotron	1249
	O. Turgut, J.E. Dusatko, J.D. Fox, C.H. Rivetta SLAC, Menlo Park, California, USA W. Höfle CERN, Geneva, Switzerland
	Funding: Work supported by the U.S. Department of Energy under contract DE-AC02-76SF00515 and the US LHC Accelerator Research program (LARP). Multi-input multi-output (MIMO) feedback design techniques can be helpful to stabilize intra-bunch transverse instabilities induced by electron-clouds or transverse mode couplings at the CERN Super Proton Synchrotron (SPS). These MIMO techniques require a reduced order model of intra-bunch dynamics. We estimate a linear reduced order MIMO models for transverse intra-bunch dynamics and use these models to design model based MIMO feedback controllers. The effort is motivated by the plans to increase currents in the SPS as part of the HL-LHC upgrade. Parameters of the reduced order models are estimated based on driven beam SPS measurements. We study different types of controllers. We test the model based designs using macro particle simulation codes (CMAD and HEADTAIL) and compare its performance with FIR filters tested during beam measurements of the feedback system in SPS machine development (MD) studies.
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MOPWI044	Beamline Insertions Manager at Jefferson Lab	software, hardware, EPICS, operation	1253
	M.C. Johnson JLab, Newport News, Virginia, USA
	Funding: This manuscript has been authored by Jefferson Science Associates, LLC under Contract No. DE-AC05-06OR23177 with the U.S. Department of Energy. The beam viewer system at Jefferson Lab provides operators and beam physicists with qualitative and quantitative information on the transverse electron beam properties. There are over 140 beam viewers installed on the 12 GeV CEBAF accelerator. This paper describes an upgrade consisting of replacing the EPICS based system tasked with managing all viewers with a mixed system utilizing EPICS and high level software. Most devices, particularly the beam viewers, cannot be safely inserted into the beam line during high-current beam operations. Software is partly responsible for protecting the machine from untimely insertions. The multiplicity of beam-blocking and beam-vulnerable devices motivate us to try a data-driven approach. The beamline insertions application components are centrally managed and configured through an object-oriented software framework created for this purpose. A rules-based engine tracks the configuration and status of every device, along with the beam status of the machine segment containing the device. The application uses this information to decide on which device actions are allowed at any given time.
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MOPWI045	The CEBAF Element Database and Related Operational Software	database, hardware, software, cavity	1256
	T. L. Larrieu, M.E. Joyce, M. Keesee, C.J. Slominski, R.J. Slominski, D.L. Turner JLab, Newport News, Virginia, USA
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. The newly commissioned 12 GeV CEBAF accelerator relies on a flexible, scalable and comprehensive database to define the accelerator. This database delivers the configuration for CEBAF operational tools, including hardware checkout, the downloadable optics model, control screens, and much more. The presentation will describe the flexible design of the CEBAF Element Database (CED), its features and assorted use case examples.
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MOPWI046	eDT and Model-based Configuration of 12 GeV CEBAF	operation, radiation, linac, synchrotron	1259
	D.L. Turner JLab, Newport News, Virginia, USA
	Funding: Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. This poster will discuss model-driven setup of CEBAF for the 12GeV era, focusing on the elegant Download Tool (eDT). eDT is a new operator tool that generates magnet design setpoints for various machine energies and pass configurations. eDT was developed in the effort towards a process for reducing machine configuration time and reproducibility by way of an accurate accelerator model.
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MOPWI048	Open XAL Build System	site, database, interface, software	1265
	T.A. Pelaia II ORNL, Oak Ridge, Tennessee, USA
	Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725 Open XAL is an accelerator physics software platform developed in collaboration among several facilities around the world. The build system is implemented through Apache Ant build files and features zero configuration simplicity based on directory patterns. These directory patterns allow for correctly building the Open XAL environment including the core and site specific applications, services, extensions, plugins and resources. Options are available for deployment and custom application packaging. This paper describes the Open XAL build rules, options and workflows.
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TUAC2	Wideband Vertical Intra-Bunch Feedback At The SPS - 2015 Results And Path Forward	feedback, kicker, simulation, optics	1353
	C.H. Rivetta, J.E. Dusatko, J.D. Fox, O. Turgut SLAC, Menlo Park, California, USA S. De Santis LBNL, Berkeley, California, USA W. Höfle CERN, Geneva, Switzerland
	Funding: Work supported by the U.S. Department of Energy under contract # DE-AC02-76SF00515 and the US LHC Accelerator Research Program (LARP) We present experimental measurements taken from CERN SPS machine development studies with a wideband intra-bunch feedback channel prototype. The demonstration system is a digital processing system with recently installed wideband kicker and amplifier components. This new hardware extends the bandwidth up to 1GHz and allows driving and controlling multiple vertical transverse modes in the bunch. The studies are focused on both driving the bunch with spectrally controlled signals to identify a reduced model of the bunch dynamics and testing model-based feedback controllers to stabilize the bunch dynamics. The measurements are structured to validate reduced MIMO models and macro-particle simulation codes, including the dynamics and limits of the feedback channel. Noise effects and uncertainties in the model are evaluated via SPS measurements to quantify the limits of control techniques applied to stabilize the intrabunch dynamics. The design of controllers for Q26 and Q20 optics are illustrated and future control developments are described.
	Slides TUAC2 [30.936 MB]
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TUPWA004	Operator Roles at the Australian Synchrotron	operation, synchrotron, database, storage-ring	1397
	D.C. McGilvery ASCo, Clayton, Victoria, Australia G. LeBlanc SLSA, Clayton, Australia
	The Accelerator Operators at the Australian Synchrotron undertake a wide variety of critical functions as part of their regular duties. In addition to normal Control Room duties, they play a major Role in Machine Physics, provide after hours support for Users on Beamlines and contribute extensively to the Controls and Database Development across the facility.
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TUPWA037	Statistical Optimization of FEL Performance	quadrupole, FEL, simulation, alignment	1496
	I.V. Agapov, G. Geloni XFEL. EU, Hamburg, Germany I. Zagorodnov DESY, Hamburg, Germany
	Modern FEL facilities such as the European XFEL will serve large number of users, thus understanding and optimizing their performance parameters such as the output power is important. In this work we describe the statistical approach to such optimization under assumption that the possibility of modelling is limited by uncertainties. We present results of such statistical optimization of SASE radiation power for FLASH and discuss how the results of such empirical tuning can be fed back into the model used in simulations
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TUPJE032	Updates of the PAL-XFEL Undulator Program	undulator, background, FEL, electron	1675
	D.E. Kim, M.-H. Cho, Y.-G. Jung, H.-S. Kang, I.S. Ko, H.-G. Lee, S.B. Lee, W.W. Lee, B.G. Oh, K.-H. Park, H.S. Suh PAL, Pohang, Kyungbuk, Republic of Korea S. Karabekyan, J. Pflüger XFEL. EU, Hamburg, Germany
	Pohang Accelerator Laboratory (PAL) is developing a 0.1 nm SASE based FEL based on 10 GeV S-band linear accelerator named PAL-XFEL. At the first stage, PAL-XFEL needs two undulator lines for photon source. The hard X-ray undulator line requires 18 units of 5 m long hybrid-type conventional planar undulator and soft X-ray line requires 6 units of 5 m long hybrid type planar undulator with additional few EPUs for final polarization control. PAL is developing undulator magnetic structure based on EU-XFEL concepts. The key parameters are min pole gap of 8.3 mm, with period length 26 mm (HXU), 35 mm (SXU), and 5.0 m magnetic length. . In this report, the prototyping, and the development of pole tuning procedure, the impact of the background field error, and the effects of the girder bending on the optical phase error will be presented.
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TUPJE036	A New Bench Concept for Measuring Magnetic Fields of Big Closed Structures	operation, vacuum, synchrotron, alignment	1690
	J. Campmany, F. Becheri, C. Colldelram, J. Marcos, V. Massana, J. Nicolás, L. Ribó ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	The measurement of big closed magnetic structures is becoming a challenge of great interest. The main reason is the tendency towards building accelerators with high magnetic fields produced by small gap magnets, as well as the development of cryogenic or superconducting narrow-gap insertion devices. Usual approach, based on side-measurements made with a Hall probe mounted on the tip of a motorized arm based on a long granite bench is no more applicable to such closed structures. So, new concepts and approaches have been developed, mainly based on complex devices that insert a Hall probe inside the magnetic structure maintaining the desired position by close-loop controls. The main problem of these devices is that they are not general-purpose oriented: they need a special vacuum chamber, require a specific geometry of the magnetic structure, or does not provide 3D field-map measurements. We present in this paper a new bench that has been built at ALBA synchrotron that is simple, multi-purpose and can be a general solution for measuring big closed structures.
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TUPJE062	First Transparent Realignment Tests at the Diamond Storage Ring	alignment, survey, storage-ring, emittance	1772
	M. Apollonio, R. Bartolini, P. Dudin, M. Hoesch, W.J. Hoffman, E.C. Longhi, A.J. Rose, A. Thomson DLS, Oxfordshire, United Kingdom R. Bartolini JAI, Oxford, United Kingdom
	The Transparent Realignment of the Diamond Storage Ring is a program of work to improve the mechanical alignment of the machine by carefully moving the magnet girders with a virtually zero impact on the associated beamlines. The girders can be moved by means of a 5-axis motion system under remote control via the EPICS toolkit from the Diamond Control Room. Currently three cells (three girders in each) have been equipped with a permanent protection system to prevent excessive deflection across each of the inter-girder vacuum bellows. The protection and motion systems are installed in the associated Control and Instrumentation Area (CIA). Full commissioning of the motion and protection systems have been completed. Results from the alignment test sessions are hereby reported.
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TUPMA014	Extending OK5 Wiggler Operational Limit at Duke FEL/HIGS Facility	wiggler, FEL, operation, electron	1863
	P.W. Wallace, M. Emamian, H. Hao, J.Y. Li, S.F. Mikhailov, V. Popov, Y.K. Wu FEL/Duke University, Durham, North Carolina, USA J.Y. Li USTC/NSRL, Hefei, Anhui, People's Republic of China
	Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033 Since 2007 the HIGS facility has been operated to produce both linearly and circularly polarized gamma-ray beams using two FELs, the planar OK-4 FEL and helical OK-5 FEL. Presently, with the OK-5 FEL operating at 192 nm, we can produce circularly-polarized gamma-ray beams between 1 and 100 MeV for user applications. Gamma-ray production between 80 and 100 MeV required an extension of the OK-5 wiggler operation beyond the designed current limit of 3.0 kA. In 2009, we upgraded cooling and machine protection systems to successfully extend OK-5 operation to 3.5 kA. To realize HIGS gamma-ray operation beyond 100 MeV and ultimately toward 150 MeV (the pion-threshold energy), with various limitations of the VUV mirror technology, the OK-5 wigglers will need to be operated at an even higher current, between 3.6 and 4.0 kA. In this paper we present our technical solution to further extend the operation range of the OK-5 wigglers, and report our preliminary results with high-current wiggler operation.
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TUPMA034	Control of Synchrotron Radiation Effects During Recirculation with Bunch Compression	emittance, recirculation, lattice, simulation	1910
	D. Douglas, S.V. Benson, R. Li, C. Tennant JLab, Newport News, Virginia, USA G.A. Krafft, B. Terzić ODU, Norfolk, Virginia, USA C.-Y. Tsai Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177. Studies of beam quality preservation during recirculation * have been extended to generate a design of a compact arc providing bunch compression with positive momentum compaction and control of both incoherent and coherent synchrotron radiation (ISR and CSR) effects using the optics balance methods of diMitri et al.. In addition, the arc/compressor generates very little micro-bunching gain. We detail the beam dynamical basis for the design, discuss the design process, give an example solution, and provide simulations of ISR and CSR effects. Reference will be made to a complete analysis of micro-bunching effects **. D. Douglas et al., these proceedings S. Benson et al., these proceedings * S. diMitri et al., Phys. Rev. Lett. 110, 014801, 2 January 2013 **** C.Y. Tsai et al., these proceedings
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TUPMA035	Control of Synchrotron Radiation Effects during Recirculation	emittance, recirculation, lattice, synchrotron	1913
	D. Douglas, S.V. Benson, A.S. Hofler, R. Kazimi, R. Li, Y. Roblin, C. Tennant JLab, Newport News, Virginia, USA G.A. Krafft, B. Terzić ODU, Norfolk, Virginia, USA C.-Y. Tsai Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177. Numerous proposals invoke recirculation and/or energy recovery for cost-performance optimization. These often encounter challenges with the beam-quality-degrading effects of incoherent and coherent synchrotron radiation (ISR and CSR). We describe a means of controlling of this degradation. The approach utilizes results by diMitri et al. , and invokes behavior observed during simulations of the recirculation process. The method is based on the use of periodically isochronous 2nd-order achromats; this not only insures that the conditions for the suppression of CSR-driven emittance growth are met, it also suppresses micro-bunching gain over a broad range of parameter space . Details of specific designs will be presented, and a reference to an analysis of micro-bunching effects provided. A planned test of the CSR suppression mechanism in CEBAF will be described. S. diMitri et al., Phys. Rev. Lett. 110, 014801, 2 January 2013. *C.Y. Tsai et al., these proceedings.
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TUPMA054	High Level Application for First Turns Commissioning in NSLS-II Storage Ring	software, storage-ring, GUI, lattice	1953
	S. Seletskiy, A. Blednykh, J. Choi, Y. Hidaka, B. Podobedov, G. Shen, L. Yang BNL, Upton, Long Island, New York, USA
	The typical problems occurring during commissioning of the first turns in the storage rings include shorted coils or reversed polarity of the magnets, cross-cabling of magnets power supplies and reversed polarity of BPMs. In this paper we describe a dedicated high level control application, which was created and utilized for commissioning of the first turns in NSLS-II storage ring.
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TUPHA005	Tools for NSLS II Commissioning	operation, status, interface, injection	1971
	G.M. Wang, G. Bassi, A. Blednykh, W.X. Cheng, J. Choi, L.R. Dalesio, M.A. Davidsaver, J.H. De Long, K. Ha, Y. Hidaka, Y. Hu, Y. Li, D. Padrazo, S. Seletskiy, T.V. Shaftan, G. Shen, K. Shroff, O. Singh, T. Summers, Y. Tian, F.J. Willeke, H. Xu, L. Yang, X. Yang BNL, Upton, Long Island, New York, USA
	The National Synchrotron Light Source II (NSLS-II) is a state of the art 3 GeV third generation light source at Brookhaven National Laboratory. As many facilities worldwide, NSLS II uses the EPICS control system to monitor and control all accelerator hardware. Control system studio (CSS) is used for simple tasks such as monitoring, display, setting of PVs. browsing the historical data, et. al. For more complex accelerator physics applications, a collection of scripts are mainly written in Python and part from Matlab during commissioning. With the close collaboration and fully support from control group, more and more CSS features were developed for operation convenience and several high level applications are interfaced with users in CSS panels for daily use based on softiocs. This paper will present the tools that we have been using for commissioning.
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TUPHA007	NSLS II Booster Extended Integration Test	booster, operation, hardware, diagnostics	1977
	G.M. Wang, B. Bacha, A. Blednykh, E.B. Blum, W.X. Cheng, J. Choi, L.R. Dalesio, M.A. Davidsaver, J.H. De Long, R.P. Fliller, G. Ganetis, W. Guo, K. Ha, Y. Hu, W. Louie, T.V. Shaftan, G. Shen, O. Singh, Y. Tian, F.J. Willeke, L. Yang, X. Yang BNL, Upton, Long Island, New York, USA P.B. Cheblakov, A.A. Derbenev, A.I. Erokhin, S.E. Karnaev, S.V. Sinyatkin BINP SB RAS, Novosibirsk, Russia V.V. Smaluk DLS, Oxfordshire, United Kingdom
	The National Synchrotron Light Source II (NSLS-II) is a state of the art 3 GeV third generation light source at Brookhaven National Laboratory. While the installation activities in the booster-synchrotron are nearly completed and waiting for the authorization to start the booster commissioning, the injector and accelerator physics group have engaged into the Integrated Testing phase. We did the booster commissioning with simulated beam signals, called extended integrated testing (EIT) to prepare for the booster ring commissioning. It is to make sure the device function along with utilities, timing system and control system, to calibrate diagnostics system, debug High Level Applications, test and optimize all the operation screens to reduce the potential problems during booster commissioning with beam.
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TUPHA008	NSLS-II Injector High Level Application Tools	operation, booster, linac, emittance	1980
	G.M. Wang, E.B. Blum, R.P. Fliller, Y. Hu, T.V. Shaftan, X. Yang BNL, Upton, Long Island, New York, USA
	The National Synchrotron Light Source II (NSLS-II) is a state of the art 3 GeV third generation light source at Brookhaven National Laboratory. The injection system consists of a 200 MeV linac, a 3 GeV booster synchrotron and transfer lines in connection of linac, booster and storage ring. The transfer lines, designed and built from BNL, are equipped with sufficient diagnostics to commission to characterize the beam parameters from linac and booster. In the paper, we summarized the high level applications tools, beam emittance, energy and energy spread measurement, developed during the injector commissioning.
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TUPTY035	Beam Dynamics Requirements for the Powering Scheme of the HL-LHC Triplet	quadrupole, simulation, optics, dynamic-aperture	2082
	M. Fitterer, R. De Maria, S.D. Fartoukh, M. Giovannozzi CERN, Geneva, Switzerland
	Funding: The HiLumi LHC Design Study is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404. For the HL-LHC, β^* values as small as 15 cm are envisaged as baseline scenario for the high luminosity insertions IR1 and IR5, thus leading to an increase of the maximum beta-functions in the inner triplet (IT). The larger beta-functions in the IT result in a higher sensitivity of the beam to any linear or non-linear, static or dynamic, field imperfections in the IT region. In this paper, we summarize accordingly the tolerances of the triplet power supplies in terms of current ripple, stability and reproducibility. Both the baseline IT powering scheme and other alternative schemes will be presented, the later reducing the tune shift caused by a current modulation and thus weakening its possible impact on the long term stability.
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TUPTY082	Scanning Synchronization of Colliding Bunches for MEIC Project	cavity, ion, electron, collider	2229
	Y.S. Derbenev, V.P. Popov JLab, Newport News, Virginia, USA Y.D. Chernousov ICKC, Novosibirsk, Russia G.M. Kazakevich Euclid TechLabs, LLC, Solon, Ohio, USA
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contracts No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Synchronization of colliding beams is one of the major issues of an electron-ion collider (EIC) design because of sensitivity of ion revolution frequency to beam energy. A conventional solution for this trouble is insertion of bent chicanes in the arcs space. In our report we consider a method to provide space coincidence of encountering bunches in the crab-crossing orbits Interaction Region (IR) while repetition rates of two beams do not coincide. The method utilizes pair of fast kickers realizing a bypass for the electron bunches as the way to equalize positions of the colliding bunches at the Interaction Point (IP). A dipole-mode warm or SRF cavities fed by the magnetron transmitters are used as fast kickers, allowing a broad-band phase and amplitude control. The proposed scanning synchronization method implies stabilization of luminosity at a maximum via a feedback loop. This synchronization method is evaluated as perspective for the Medium Energy Electron-Ion collider (MEIC) project of JLab with its very high bunch repetition rate.
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TUPWI004	Status of the TOP-IMPLART Proton LINAC	proton, linac, operation, klystron	2245
	P. Nenzi, A. Ampollini, G. Bazzano, F. Marracino, L. Picardi, C. Ronsivalle, V. Surrenti, M. Vadrucci ENEA C.R. Frascati, Frascati (Roma), Italy F. Ambrosini University of Rome La Sapienza, Rome, Italy F. Ambrosini Università di Roma "La Sapienza", SAPIENZA-DIET, Roma, Italy C. Snels ENEA Casaccia, Roma, Italy
	In this work we present the latest update on the TOP-IMPLART LINAC. It is a 150 MeV proton linear accelerator for protontherapy application under realization at ENEA-Frascati in the framework of a project developed by ENEA, the Italian National Institute of Health (ISS) and Regina Elena National Cancer Institute-IFO-Rome. The accelerator consists of a 7 MeV injector operating at 425 MHz followed by a LINAC booster working at 2997.92 MHz at a maximum repetition frequency of 100 Hz. The medium energy section up to 35 MeV is a sequence of four SCDTL modules (Side Coupled Drift Tube LINAC) powered by a single 10 MW klystron: the first module bringing beam energy from 7MeV to 11.6MeV with an input power of 1.3 MW in a 4usec pulse has been successfully commissioned with a 10 uA per pulse beam accelerated at the design energy demonstrating the functionality of low energy proton acceleration at high RF frequency. The effects on beam dynamics, caused by the absence of any harmonic relation between the two operating frequencies of the LINAC has been simulated and experimentally verified during the commissioning activity. The second and third module installation and testing is undergoing.
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TUPWI005	Proton Irradiations of Micro-TOM Red Hairy Roots to Mimic Space Conditions	proton, experiment, radiation, framework	2249
	M. Vadrucci, A. Ampollini, G. Bazzano, P. Nenzi, L. Picardi, C. Ronsivalle, V. Surrenti ENEA C.R. Frascati, Frascati (Roma), Italy F. Ambrosini Università di Roma "La Sapienza", SAPIENZA-DIET, Roma, Italy E. Benvenuto, A. Desiderio, S. Massa, C. Snels, M.E. Villani ENEA Casaccia, Roma, Italy
	Funding: Radiation Sources Laboratory UTAPRAD Department ENEA C.R. Frascati Via E. Fermi, 45 00044 Frascati (RM), Italy ENEA The purpose of the BIOxTREME project, launched by ENEA and funded by ASI (Italian Space Agency), is to formulate new biological drugs having a stimulant activity on the immune system finalizing the production for a ready to use resource in Bioregenerative Life Support Systems (BLSSs) for space missions with extended durations, in deep space, and with multiple crews. One of the project tasks is to study the effects of physical insults on plants, simulating cosmic environment on production platforms by static magnetic fields, microgravity and ionizing radiation. In order to examine the biological effects, to test plant radio-resistance and to build dose-response curves we carried out proton irradiations of a tomato cultivar Micro-Tom red hairy roots with the TOP-IMPLART accelerator at the ENEA Frascati Research center. The biological samples were placed in a holder specially made in a movable real-time monitoring chamber calibrated in dose. The fluence-homogeneity measurements over the sample and the calibration of the monitoring system were performed using GafChromic EBT3 films. The paper describes the experimental set-up and reports the preliminary results.
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TUPWI006	How Knowledge and Technological Transfer can Develop into an Industrial Reality: Kyma Srl case history	insertion, insertion-device, undulator, operation	2253
	R. Geometrante, M. Zambelli KYMA, Trieste, Italy M. Zambelli Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	Kyma was established in 2007 as a spin-off company of Elettra-Sincrotrone Trieste, to design, realize and install all the 18 undulators of FERMI, the seeded FEL, at the time being built at the Elettra lab in Trieste, Italy. For Kyma establishment, Elettra-SincrotroneTrieste formally transferred to the new company know-how and references relevant to Insertion Devices and, by a Knowledge Transfer monetarily evaluated, could participate to Kyma capital owning the 51% of the shares. In few years, Kyma became a well-known organization in the light source community. After more than forty Insertion Devices and sixty phase shifters designed and manufactured, Kyma is now recognized as a qualified partner for design and development of this kind of equipment. Some examples of Kyma industrial achievements in developing skills, knowledge, technologies methods of manufacturing transferred by Universities and Institution, will be presented. An example out of many: the joint effort between Kyma and Cornell University right now leading to the development of a new perspective into the ID world, i.e. the CHESS Compact Undulators (CCU).
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TUPWI015	Experience on Serial Production of the Quadrupole Movers with Submicrometric Repeatability for the European XFEL*	quadrupole, hardware, dumping, operation	2271
	J. Munilla, J. Calero, L. García-Tabarés, A. Guirao, J.L. Gutiérrez, T. Martínez, E. Molina Marinas, F. Toral, C. Vázquez CIEMAT, Madrid, Spain J.A. Gorrotxategi, M. Tarragual ZEHATZ, Mendaro, Spain B. Junkera, A. Urzainki DMP, Mendaro, Spain C. Martins, E. Ramiro, F. Ramiro RAMEM, Madrid, Spain
	Funding: This work is partially supported by the Spanish Ministry of Science and Innovation under SEI Resolution on 17-September-2009 and Project ref. AIC10-A-000524 CIEMAT is in charge of the design and manufacturing of the quadrupole movers with submicrometric repeatability for the XFEL. EU intersections. Prototyping of these precision devices was successful but manufacturing them in a serial production scheme (101 units) implies some changes at design, fabrication procedures and quality controls. This paper will present some of the main problems and solutions adopted to transform a prototype made at a research facility into a serial production at a conventional industrial company. Also, it describes the inspection and tests, the quality controls and reporting procedures. All the devices have been validated and recepted. This paper describes the adopted procedure and the performance of the serial units.
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TUPWI016	Gantry 3: Further Development of the PSI PROSCAN Proton Therapy Facility	proton, cyclotron, coupling, dipole	2275
	A. Koschik PSI, Villigen, Villigen, Switzerland C. Bula, J.P. Duppich, A. Gerbershagen, M. Grossmann, J.M. Schippers, J. Welte PSI, Villigen, Switzerland
	PSI and its Center for Proton Therapy (CPT) is extending its research capabilities in the field of proton therapy and pencil beam scanning technology. Gantry 3 will be an additional treatment room at the PROSCAN facility at PSI, Villigen, Switzerland. It will feature a 360 degree scanning Gantry delivered by Varian Medical Systems. The Gantry design is based on Varian technology, which will be combined with advanced PSI active scanning technology. The further development of fast energy switching as well as precise spot and continuous line scanning irradiation modes are main research topics at the PROSCAN facility. A major challenge with Gantry 3 is the link of the existing PSI PROSCAN system with the Varian PROBEAM system, while retaining the system integrity and high performance level. Additionally, Gantry 3 will be installed and commissioned while keeping the other treatment rooms (Gantry 1, Gantry 2, Optis 2) in full operation. The current development and project status is presented.
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Paper

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MOAB3

Commissioning Results of the New BPM Electronics of the ESRF Booster Synchrotron

booster, electronics, extraction, injection

24

M. Cargnelutti
I-Tech, Solkan, Slovenia
K.B. Scheidt
ESRF, Grenoble, France

The 75 BPM stations of the Booster Synchrotron of the ESRF have been equiped with new RF electronics from December 2014. This new BPM system is based on the commercial Libera-Spark system and now provides beam position data at various output rates, and with a possible time resolution even below that of the orbit-turn time (1 us). All modules are situated inside the Booster tunnel and powered by an Ethernet cable. This implies that the RF cables from the BPM blocks are less then 3 m and only a single trigger signal in daisy chain is sufficient to keep the 75 stations in turn-by-turn phase over the full energy ramping (200 MeV to 6 GeV) time of typically 50 ms. The high sensitivity of the system yields excellent performance at very low beam currents down to 1 0uA. Full results of the system, including the application as a high quality betatron tune monitor, will be presented.

Slides MOAB3 [5.781 MB]

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MOBB2

Fabrication of TESLA-shape 9-cell Cavities at KEK for Studies on Mass-Production in Collaboration with Industries

cavity, SRF, cryomodule, status

31

T. Saeki, H. Hayano
KEK, Ibaraki, Japan

The construction of the new Center-of-Innovation (COI) buiding started at KEK from 2014 for the studies of mass-production of Superconducting-RF accelerators in collaboration with industries. The COI buiding is sitting next to the existing KEK-STF building and will include various Superconducting-RF facilities like clean-room for cavity-string assembly, cryomodule-assembly facility, cryogenic system, vertical-test facility, cryomodule-test facility, input-coupler processing facility, cavity Electro-Polishing (EP) facility, and control-room/office-rooms in the dimension of 80 m x 30 m. The purpose of this new SRF facilities is to establish a close collaboration between SRF researchers and industries in order to prepare for the upcoming large-scale future SRF project, like ILC. This article reports the fabricaion of four TESLA-shape 9-cell cavities for the commisioning of these new facilities. Details of the fabrication of these four cavities will be presented.

Slides MOBB2 [3.983 MB]

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MOAD2

RF Breakdown of 805 MHz Cavities in Strong Magnetic Fields

cavity, Windows, operation, klystron

53

D.L. Bowring, A.V. Kochemirovskiy, M.A. Leonova, A. Moretti, M.A. Palmer, D.W. Peterson, K. Yonehara
Fermilab, Batavia, Illinois, USA
B.T. Freemire
IIT, Chicago, Illinois, USA
A.A. Haase
SLAC, Menlo Park, California, USA
P.G. Lane, Y. Torun
Illinois Institute of Technology, Chicago, Illinois, USA
D. Stratakis
BNL, Upton, Long Island, New York, USA

Ionization cooling of intense muon beams requires the operation of high-gradient, normal-conducting RF structures in the presence of strong magnetic fields. We have measured the breakdown rate in several RF cavities operating at several frequencies. Cavities operating within solenoidal magnetic fields B > 0.25 T show an increased RF breakdown rate at lower gradients compared with similar operation when B = 0 T. Ultimately, this breakdown behavior limits the maximum safe operating gradient of the cavity. Beyond ionization cooling, this issue affects the design of photoinjectors and klystrons, among other applications. We have built an 805 MHz pillbox-type RF cavity to serve as an experimental testbed for this phenomenon. This cavity is designed to study the problem of RF breakdown in strong magnetic fields using various cavity materials and surface treatments, and with precise control over sources of systematic error. We present results from tests in which the cavity was run with all copper surfaces in a variety of magnetic fields.

Slides MOAD2 [10.792 MB]

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MOPWA027

Generic Settings Generation for FAIR: First Experience at SIS18

resonance, framework, operation, cavity

156

D. Ondreka, J. Fitzek, H. Liebermann, R. Müller
GSI, Darmstadt, Germany

The accelerators of the FAIR facility will be operated using a new control system presently under design at GSI. One of its major components, the module for settings generation and management, is based on the framework LSA developed at CERN. Its task is the provision and administration of set values for all devices in the FAIR facility. The set values for any accelerator are derived from a machine model, implemented by accelerator physicists using the features of the LSA framework. In view of the large number of accelerators in the FAIR facility, the aim is to develop a generic model, applicable to any of those machines. This requires the introduction of an additional logical layer on top of the LSA framework, ensuring the coherence of the modeling strategy across all accelerators. Following this design concept, a prototype of the FAIR settings management system has been realized at GSI, providing support for a large number of operation modes relevant for the later operation of FAIR. The prototype has been used extensively during recent machine experiments with the synchrotron SIS18, performed both to benchmark the machine model and to support further machine developments for FAIR.

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MOPWA028

Resonance Compensation for High Intensity Bunched Beams

resonance, space-charge, sextupole, ion

159

G. Franchetti, S. Aumon, F. Kesting, H. Liebermann, C. Omet, D. Ondreka, R. Singh
GSI, Darmstadt, Germany

Mitigation of periodic resonance crossing induced by space charge is foreseen via classic resonance compensation. The effect of the space charge is, however, not obvious on the effectiveness on the compensation scheme. In this proceeding we report on an experimental campaign performed at SIS18 in an attempt to investigate experimentally the effect of space charge on the resonance compensation. The experimental results and their consequences are discussed through numerical simulations.

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MOPWA031

A New Approach for Resistive Wakefield Calculations in Time Domain

wakefield, impedance, simulation, cavity

168

A.V. Tsakanian, H. De Gersem, E. Gjonaj, T. Weiland
TEMF, TU Darmstadt, Darmstadt, Germany
M. Dohlus, I. Zagorodnov
DESY, Hamburg, Germany

We report on a new numerical technique for the computation of the wakefields excited by ultra-short bunches in the structures with walls of finite conductivity. The developed 3D numerical method is fully time domain. It is based on special Staggered Finite Volume Time Domain (SFVTD) method and has no numerical dispersion in all three axial directions simultaneously. This results in large saving in computational time as well as improved accuracy. The resistive boundary model applies Surface Impedance Boundary Condition (SIBC) evaluation in time domain and covers boundary effects like frequency dependent conductivity, surface roughness and metal oxidation. A good agreement between numerical simulation and perturbation theory is obtained. In addition the new method allows implementation of moving mesh approach that considerably reduces requirements on computational resources. The developed method is especially effective for short range resistive wakefield calculations excited by ultra-short bunches used in FEL based LINACs.

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MOPWA040

Virtual Cavity Probe Generation using Calibrated Forward and Reflected Signals

cavity, coupling, flattop, laser

200

S. Pfeiffer, V. Ayvazyan, J. Branlard, L. Butkowski, H. Schlarb, Ch. Schmidt
DESY, Hamburg, Germany
R. Rybaniec
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland

The European X-ray free electron laser requires a high-precision control of accelerating fields to ensure a stable photon generation. Its low level radio frequency system, based on the MicroTCA.4 standard, detects the probe, forward and reflected signals for each cavity. While the probe signal is used to control the accelerating fields, a combination of the forward and reflected signals can be used to compute a virtual probe, whose accuracy is comparable to the directly sampled probe. This requires the removal of cross-coupling effects between the forward and reflected signals. This paper presents the precise generation of a virtual probe using an extended method of least squares. The virtual probe can then be used for precise field control in case the probe signal is missing or corrupted. It can also be used to detect any deviation from the nominal probe profile.

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MOPJE028

Detailed Characterization of ALBA Quadrupoles for Beta Function Determination

quadrupole, storage-ring, synchrotron, optics

338

Z. Martí, J. Campmany, J. Marcos, V. Massana
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
X.N. Gavaldà
SOLEIL, Gif-sur-Yvette, France

Beta function value at quadrupoles for a circular accelerator can be determined using the relationship between the machine tune and the quadrupole strength. ALBA Storage Ring quadrupoles were measured during manufacturing, to be sure that their performance fitted the specifications. However, measurements were done at a number of currents that are not enough for an accurate determination of the beta function value. In fact, at least 1% error in the calibration of the hysteresis curve slope of the quadrupole is required, and therefore new detailed measurements of the hysteresis cycle are needed. In order to make these measurements, spare quadrupoles existing at ALBA have been used. In this paper we present the results of beta function values determination using this method for ALBA storage ring.

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MOPJE047

Chromaticity Dependence of the Transverse Effective Impedance in the CERN Proton Synchrotron

impedance, proton, synchrotron, space-charge

395

S. Persichelli, N. Biancacci, S.S. Gilardoni, A. Huschauer, E. Métral, B. Salvant, R. Wasef
CERN, Geneva, Switzerland
M. Migliorati
University of Rome La Sapienza, Rome, Italy

The current knowledge of the transverse impedance of the Proton Synchrotron (PS) has been established with beam-based measurements at different energies. The transverse coherent tune shift as a function of the beam intensity has been measured in order to evaluate the total effective imaginary part of the transverse impedance and its localization in the accelerator at the energies of 2, 7, 13 and 25 GeV. Measurements have been performed changing the chromaticity for every tune shift scan with intensity. The data analysis revealed an increase of impedance with chromaticity for all the energies considered. That transverse impedance can be compared with the previously evaluated theoretical impedance budget taking into account the individual contribution of several machine devices. The missing impedance is finally highlighted.

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MOPJE081

Longitudinal Stability in Multi-Harmonic Accelerating Cavities

cavity, acceleration, accelerating-gradient, cathode

506

R.M. Jones, L.R. Carver
UMAN, Manchester, United Kingdom
J.L. Hirshfield
Yale University, Physics Department, New Haven, CT, USA
Y. Jiang
Yale University, Beam Physics Laboratory, New Haven, Connecticut, USA

Accelerating cavities that excite multiple modes at integer harmonics of the fundamental frequency can potentially be used to limit the effects of rf breakdown and pulsed surface heating at high accelerating gradients. Understanding the longitudinal stability and the acceptance of such a cavity is important to their development and use. The general Hamiltonian for longitudinal stability in multi harmonic cavities is derived and the particle dynamics are explored.

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MOPMA004

Numerical Optimization of Accelerators within oPAC

network, simulation, lattice, quadrupole

533

C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom

Funding: This project has received funding from the European Union’s Seventh Framework Programme for research, technological development and demonstration under grant agreement no 289485.
Powerful simulation tools are required for every accelerator and light source to study the motion of charged particles through electromagnetic fields during the accelerator design process, to optimize the performance of machine diagnostics and to assess beam stability and non-linear effects. The Optimization of Particle Accelerators (oPAC) Project is funded by the EU within the 7th Framework Programme and currently supports 23 Fellows that are based at institutions across Europe. This large network carries out R&D that closely links beam physics studies with the development of diagnostics and beyond state-of-the-art simulation tools. This contribution presents selected research outcomes from oPAC, including the numerical optimization of beam loss monitor locations along the European Spallation Source’s 5 MW proton linac, results from tracking studies for the LHeC lattice that allow beam stability to be assessed, and multi-objective optimization of the linear and non-linear beam dynamics of the synchrotron SOLEIL. In addition, an overview of recent and future oPAC events is also given.

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MOPMA052

Implementation of Quadrupole-scan Emittance Measurement at Fermilab's Advanced Superconducting Test Accelerator (ASTA)

emittance, quadrupole, monitoring, simulation

669

A.T. Green
Northern Illinois Univerity, Dekalb, Illinois, USA
Y.-M. Shin
Fermilab, Batavia, Illinois, USA
Y.-M. Shin
Northern Illinois University, DeKalb, Illinois, USA

Funding: This work was supported by the DOE contract No. DEAC02-07CH11359 to the Fermi Research Alliance LLC.
Transverse-emittance measurements based on the quadrupole-scan technique * ** ***, have been widely used to characterize the beam phase-space parameters in linear accelerators. This paper discusses the implementation of the technique at the Advanced Superconducting Test Accelerator (ASTA) at Fermilab. We plan on deploying a flexible implementation that permits an operator to select the quadrupole associated analysing screen to measure the beam emittance. Our implementation utilizes Python scripts combined with Fermilab’s control system ACNet and ELEGANT quadrupole-scan method at 50 MeV given the range of operating charge (20 pC to 3.2 nC) available at ASTA. Some preliminary measurements will also be presented.
* B.E. Carlsten, et al, Nucl. Instrum. Methods Phys. Res. Sect. A 331, 791 (1993)
** C. Eckman et al, IPAC 2012
*** K. Poorrezaei, et al, Phys. Rev. ST-AB 16, 082801 (2013)

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MOPHA002

Operational Applications - a Software Framework Used for the Commissioning of the MedAustron Accelerator

framework, injection, software, operation

773

A. Wastl, M. Hager, M. Regodic
EBG MedAustron, Wr. Neustadt, Austria

MedAustron is a synchrotron-based cancer therapy and non-clinical research center located in Austria. Its accelerator is currently being commissioned prior to first medical treatment. During the tuning of the machine, many iterations of measurements involving several parameter changes are performed in order to optimize the accelerator’s performance. An operation and measurement software framework called 'Operational Application Framework' (OpApp) has been developed for this purpose. It follows a modular approach and provides basic methods like ‘write to file’ or ‘measure beam position monitor‘. By appropriately combining modules, OpApps performing automatized measurements and complex procedures can be created. A detailed description of the setup as well as examples of use are provided here.

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MOPHA006

A Slow RF-Laser Feedback for PHIL Photoinjector

laser, feedback, gun, electron

784

N. ElKamchi, V. Chaumat, V. Soskov
LAL, Orsay, France

PHIL is an electron beam accelerator at LAL. It produces low energy (E<5 MeV) and high current (1 nC/bunch) electrons bunch at a repetition frequency of 5Hz. The stability of the beam charge at PHIL is a key issue for the succeful operation of the physic experiences that use the machine. At PHIL, the beam charge is quite stable, but we often note a slow charge drift on long duration experiences. Two ICTs, and a back-end electronics are used to monitor the stability of the beam charge, with an accuracy of about 1pC. Several types of jitter can impact the stability of the beam charge. The fluctuations of the RF power or the RF-laser relative phase drift could have significant influence, due to temperature variations that produce cables dilataion, and electronic components overheating. To correct the phase drift, we describe a method based on a slow analog-digital feedback loop between the RF wave in the gun (3 GHz) and the synchronisation signal of the laser (75MHz). It allows to maintain the jitter between the laser pulse and the RF wave stable at a very low value. As a result, the electron beam charge is maintained at a stable level, to meet the requirements of the users.

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MOPHA008

Investigation of Beam Halo Using In Vacuum Diamond Sensor at ATF2

electron, pick-up, vacuum, laser

791

S. Liu, P. Bambade, F. Bogard, P. Cornebise, V. Kubytskyi, C. Sylvia
LAL, Orsay, France
A. Faus-Golfe, N. Fuster-Martínez
IFIC, Valencia, Spain
T. Tauchi, N. Terunuma
KEK, Ibaraki, Japan
T. Tauchi, N. Terunuma
Sokendai, Ibaraki, Japan

Funding: Chinese Scholarship Council, CNRS and P2IO LABEX
Beam halo transverse distribution measurements are of great importance for the understanding of background sources of the nano-meter beam size monitor at the interaction point (IPBSM) of ATF2. One of the most critical issues for the beam halo measurement is to reach high dynamic range. Two in vacuum diamond sensor beam halo scanners (DSv) with four strips each have been developed for the investigation of beam halo transverse distributions at ATF2. The first DSv was installed for horizontal beam halo scanning after the interaction point (IP) of ATF2, in Nov. 2014. It aims to measure the beam halo distribution with large dynamic range (~10⁶), and investigate the possibility of probing the Compton recoil electrons produced in the interaction with the IPBSM laser beams. Studies to characterize the DS performance and measurements of horizontal beam halo performed in Nov.-Dec. 2014 are presented.

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MOPHA019

Implementation of a High Level Phase Controller for the Superconducting Injector of the S-DALINAC

electron, cavity, EPICS, injection

814

T. Bahlo, C. Burandt, F. Hug, N. Pietralla
TU Darmstadt, Darmstadt, Germany

Funding: This work has been supported by the DFG through CRC 634
The Superconducting DArmstadt LINear Accelerator S‑DALINAC is a recirculating electron accelerator with a design energy of 130 MeV. It operates in cw-mode at a radio frequency of 3 GHz and provides either unpolarized or polarized electron beams. Before entering the main accelerator the electron beam passes both, a normal-conducting injector beamline for beam preparation and a superconducting 10 MeV injector beamline for preacceleration. The phase of the beam which is injected into the 40 MeV main accelerator is crucial for the efficiency of the acceleration process and the minimization of the energy spread. Due to thermal drifts of the normal-conducting injector cavities this injection phase varies by about 0.2 degree over a timescale of an hour. In order to compensate these drifts, a high level phase controller has been implemented. It adjusts the phase measured at an rf-monitor at the exit of the superconducting injector by changing the phase of a prebuncher in the normal-conducting injector beamline. We will present the used hardware, the control algorithm as well as measurements showing the phase stabilization achieved by this controller.

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MOPHA020

Automated Transverse Beam Emittance Measurement using a Slow Wire Scanner at the S-DALINAC

emittance, quadrupole, electron, EPICS

817

P. Dijkstal, M. Arnold, C. Burandt, F. Hug, N. Pietralla
TU Darmstadt, Darmstadt, Germany

Funding: This work has been supported by the DFG through CRC 63 and by the EPS-AG through the EPS-AG student grant program.
The superconducting linear accelerator S-DALINAC of the TU Darmstadt provides electron beams of up to 130 MeV in cw mode. It consists of a 10 MeV injector and a 40 MeV main linac, both equipped with elliptical cavities operating in liquid helium at 2 K at a frequency of 3 GHz. The final energy is reached by using up to two recirculation paths. In order to improve beam simulations, it is planned to monitor the transverse beam emittance at different locations along the beam line. A system of slow wire scanners in combination with quadrupole variation is foreseen to accomplish this task. For a first test a wire scanner was installed in the 250 keV section behind the thermionic electron gun of the S-DALINAC. A procedure to automatize measurements was developed and integrated in the EPICS-based control system. We will show the status of the work on the automatized control and the results of first emittance measurements. A report on the future plans will be given.

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MOPHA021

Bunch-by-Bunch Longitudinal RF Feedback for Beam Stabilization at FAIR

feedback, LLRF, cavity, synchrotron

820

K. Groß, H. Klingbeil
TEMF, TU Darmstadt, Darmstadt, Germany
U. Hartel, H. Klingbeil, U. Laier, D.E.M. Lens, K.-P. Ningel, S. Schäfer, B. Zipfel
GSI, Darmstadt, Germany

Funding: Work supported by the German Federal Ministry of Education and Research (BMBF) under the project 05P12RDRBF.
To damp undesired longitudinal oscillations of bunched beams, the main synchrotron SIS100 of FAIR (Facility for Antiproton and Ion Research) will be equipped with a bunch-by-bunch feedback system. This helps to stabilize the beam, to keep longitudinal emittance blow-up low and to minimize beam losses. The proposed LLRF (low level radio frequency) topology of the closed loop feedback system is described. In some aspects, it is similar to the beam phase control system* developed at GSI Helmholtzzentrum für Schwerionenforschung GmbH. The differences and challenges are pointed out, which are mainly the bunch-by-bunch signal processing followed by the generation of a correction voltage in dedicated feedback cavities. The adapted topology was verified at SIS18 during beam time in 2014 using LLRF prototype subsystems and the two existing ferrite-loaded acceleration cavities. The experimental setup to damp coherent longitudinal dipole oscillations is presented and evaluated with focus on the realized modifications, including ongoing and pending investigations. Finally, the current status of the longitudinal feedback system for FAIR is summarized.
* Klingbeil et al., IEEE Trans. Nuc. Sci., Vol. 54, No. 6, 2007.

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MOPHA025

Control System for FRANZ Facility

ion, ion-source, proton, neutron

830

S.M. Alzubaidi, O. Meusel, U. Ratzinger, C. Wagner
IAP, Frankfurt am Main, Germany

The Frankfurt Neutron Source at the Stern- Gerlach Zentrum (FRANZ) will use the reaction of 7Li(p, n)7Be to produce an intense neutron beam. The neutron energy will be between 10 and 500 keV depending on the primary proton beam, which is variable between 1.8 and 2.2 MeV. A volume type ion source will be used to deliver a 120 keV proton beam with currents up to 200 mA. Like any other facility, FRANZ will need a powerful and reliable control system that also allows monitoring the whole accelerator target areas and experiments. Also interlock and safety systems have to be included to protect personnel from radiation hazards associated with accelerator operations and accompanying experiments. The FRANZ control system is still under development. The ion source will be the first element to be controlled, and to gain experience. A test ion source will be used for testing and examining the performance of this control system. In this paper, the plasma properties, filament ageing and an internal control loop for stable beam production with respect to controlling issues will be discussed.

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MOPHA030

Commissioning of the Low-Noise MTCA.4-based Local Oscillator and Clock Generation Module

hardware, shielding, monitoring, distributed

847

U. Mavrič, J. Branlard, M. Hoffmann, F. Ludwig, H. Schlarb
DESY, Hamburg, Germany
D.R. Makowski, A. Mielczarek, P. Perek
TUL-DMCS, Łódź, Poland
A. Rohlev
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

Funding: Helmholtz Validation Fund Project "MicroTCA.4 for Industry"
Within the Helmholtz Validation Fund Project "MicroTCA.4 for Industry", DESY together with collaboration partners from industry and research developed a compact fully MicroTCA chassis-integrated local RF oscillator module. The local oscillator and clock generation module generates a low noise local oscillator out of the global reference that is distributed over the accelerator. The module includes a splitting section which provides 9 local oscillator signals which are distributed over the RF-Backplane to the rear-transition modules. Similarly, the clock signal is also generated out of a single reference input by means of low-noise dividers. The clock is then fan-out to 22 differential lines that are routed over the RF backplane to the rear-transition modules. The functional block is implemented such that it fits in the rear slots 15 and 14 of a standard MTCA.4 crate. In the paper the commissioning results measured on the L3 low-level RF stations of the European XFEL will be presented.

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MOPHA031

Implementation of a Diagnostic Pulse for Beam Optics Stability Measurements at FLASH

kicker, optics, diagnostics, betatron

850

F. Mayet, R.W. Aßmann, S. Schreiber, M. Vogt
DESY, Hamburg, Germany

In order to monitor long-term stability of beam optics, simple and at the same time minimally invasive procedures are desirable. Using selectively kicked bunches, betatron phase advance, as well as potential growth of the betatron oscillation amplitude and the Twiss parameters alpha and beta can be extracted from BPM data. If done periodically, this data can be compiled into a long-term history that is accessible via the control system. This way it is possible to identify potential sources of beam optics errors. At FLASH the procedure could be implemented as a server/client tool. Since the whole procedure takes less than five seconds, operation is not disturbed significantly. In this work the possible implementation of the procedure is presented. It is also shown how the history data can be evaluated in order to infer possible beam optics error sources.

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MOPHA032

All-Optical Synchronization of Pulsed Laser Systems at FLASH and XFEL

laser, timing, LLRF, FEL

854

J.M. Müller, M.K. Czwalinna, M. Felber, M. Schäfer, H. Schlarb, B. Schmidt, S. Schulz, C. Sydlo, F. Zummack
DESY, Hamburg, Germany

The all-optical laser synchronization at FLASH and XFEL provides femtosecond-stable timing of the FEL X-ray photon pulses and associated optical laser pulses (photo-injector laser, seed laser, pump-probe laser, etc.). Based on a two-color balanced optical cross-correlation scheme a high-precision measure of the laser pulse arrival time is delivered, which is used for diagnostic purposes as well as for the active stabilization of the laser systems. In this paper, we present the latest installations of our all-optical synchronization systems at FLASH and the recent developments for the upcoming European XFEL that will ensure a reliable femtosecond-stable timing of FEL and related pulsed laser systems.

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MOPHA044

Testing a Digital Beam Position Stabilization for the P2-experiment at MESA

experiment, FPGA, feedback, electron

888

M. Dehn, K. Aulenbacher, J. Diefenbach, F. Fichtner, R. Herbertz, W. Klag
IKP, Mainz, Germany

Funding: Work supported by the German Federal Ministry of Education and Research (BMBF) and German Research Foundation (DFG) under the Collaborative Research Center 1044 and the Cluster of Excellence "PRISMA"
The Mainz Energy recovering Superconducting Accelerator (MESA) will be built at the institute for nuclear physics at Mainz University. Besides the multi-turn energy recovery mode an external beam mode is foreseen to provide 155 MeV electrons of 85% polarization at 150 μA for parity violating experiments. To achieve the required stability of the main beam parameters a dedicated digital position stabilization is currently developed and tested at the Mainz Microtron (MAMI).

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MOPHA045

Developments and Performance of the LLRF System of the S-Band FERMI Linac

LLRF, klystron, cavity, feedback

891

A. Fabris, F. Gelmetti, M. Milloch, M. Predonzani
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

The requirements on beam quality on the FERMI Free Electron Laser (FEL) linac impose challenging specifications on the stability of the RF fields that can only be met by using high reliable and high performance state of the art LLRF systems. The system installed in FERMI has met these requirements and is routinely operational for the machine on a 24/7 basis. The completion of the deployment of the LLRF units in 2015 increases the capabilities of the system, adding further measurement channels and monitoring, and allowing new functionalities. This paper provides an overview of the results achieved with the LLRF system of FERMI and an outlook of the further developments that are being implemented or planned.

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MOPHA046

!CHAOS Status and Evolution

framework, interface, distributed, database

894

G. Mazzitelli, C. Bisegni, S. Caschera, G. Di Pirro, L.G. Foggetta, R. Gargana, E. Gioscio, D. Maselli, A. Michelotti, R. Orrù, S. Pioli, F. Spagnoli, A. Stecchi, M. Tota
INFN/LNF, Frascati (Roma), Italy
D.G.C. Di Giulio
INFN-Roma II, Roma, Italy

A synthesis of the “!CHAOS: a cloud of controls” project and its application to accelerators and large experiments will be presented. We will describe here how the !CHAOS project has evolved from a candidate for the SuperB accelerator control system to a facility for IT distributed infrastructures. !CHAOS is currently, not only suitable for accelerators and large High Energy Physics (HEP) experiments, but is also applicable to other contexts, such as social and industrial applications. Preliminary results achieved on an accelerator use case are discussed.

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MOPHA047

RF System Design for the TOP-IMPLART Accelerator

LLRF, proton, klystron, linac

897

V. Surrenti, G. Bazzano, P. Nenzi, L. Picardi, C. Ronsivalle
ENEA C.R. Frascati, Frascati (Roma), Italy
F. Ambrosini
Università di Roma "La Sapienza", SAPIENZA-DIET, Roma, Italy

In the ENEA-Frascati research center a linear accelerator for proton therapy is under development in the framework of TOP-IMPLART Project carried out by ENEA in collaboration with ISS and IRE-IFO. The machine is based on a 7 MeV injector operating at a frequency of 425 MHz followed by a sequence of 2997.92 MHz accelerating modules. Five 10 MW klystrons will be used to power all high frequency structures up to a beam energy of 150 MeV. The maximum repetition frequency is 100 Hz and the pulse duration is 4 μs. The RF amplitude and phase stability requirements of the accelerating field are within ±2% and ±2 degrees respectively. For therapeutic use the beam energy will be varied between 85 and 150 MeV by switching off the last modules and varying the electric field amplitude in the last module switched on. Fast control of the RF power supplied to the individual structures allows an energy variation on a pulse by pulse basis; furthermore the system must be able to control the RF phase between accelerating structures. This work describes the RF power distribution scheme and the RF phase and amplitude monitoring system implemented into an embedded control system.

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MOPHA049

Evolution of Diagnostics and Services of the DAΦNE Beam Test Facility

vacuum, detector, linac, diagnostics

904

L.G. Foggetta, B. Buonomo
INFN/LNF, Frascati (Roma), Italy
P. Valente
INFN-Roma, Roma, Italy

The DAΦNE Beam Test Facility (BTF) is operational in Frascati since 2003. In the last years the beam diagnostics tools have been completely renewed and the services for users have been largely improved. We describe here the new transverse beam diagnostics based on new GEM TPC detectors and Timepix/FitPix, the new BTF network layout, the renewed DAQ system including the BCM detectors, the data caching system based on MEMCached and the integration of the new sub-systems in the new data-logging. All other services, such as the environmental monitoring system, vacuum system, payload remote handling, and gas distribution have been also improved.

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MOPHA056

Status of LLRF Control System for SuperKEKB Commissioning

cavity, LLRF, beam-loading, klystron

924

T. Kobayashi, K. Akai, K. Ebihara, A. Kabe, K. Nakanishi, M. Nishiwaki, J.-I. Odagiri
KEK, Ibaraki, Japan
H. Deguchi, K. Hayashi, T. Iwaki, M. Ryoshi
Mitsubishi Electric TOKKI Systems, Amagasaki, Hyogo, Japan

Beam commissioning of the SuperKEKB will be started in JFY2015. A new LLRF control system, which is an FPGA-based digital RF feedback control system on the MicroTCA platform, has been developed for high current beam operation of the SuperKEKB. The mass production and installation of the new systems has been completed as scheduled. The new LLRF control systems are applied to nine RF stations (klystron driving units) among existing thirty stations. As a new function, klystron phase lock loop was digitally implemented within the cavity FB control loop in the FPGA, and in the high power test it worked successfully to compensate for the klystron phase change. Beam loading was also simulated in the high power test by using an ARES cavity simulator, and then good performance in the cavity-voltage feedback control and the cavity tuning control was demonstrated to compensate the large beam loading for the SuperKEKB parameters. Fabrication of another new LLRF control system for damping ring which is required for low-emittance positron injection is scheduled in JFY2015.

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MOPHA059

Control System Upgrade for SuperKEKB Injector Linac

linac, operation, EPICS, Linux

930

M. Satoh, K. Furukawa, K. Mikawa, F. Miyahara, Y. Seimiya, T. Suwada
KEK, Ibaraki, Japan
T. Kudou, S. Kusano
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
H.S. Saotome, M. Takagi
Kanto Information Service (KIS), Accelerator Group, Ibaraki, Japan

Toward SuperKEKB project, the electron/positron injector linac upgrade is ongoing at KEK in order to deliver the low emittance electron/positron beams with high bunched charge intensity and small emittance. A large number of accelerator components and control devices will be newly installed before the autumn of 2014. Finally, we are aiming at the simultaneous top-up operation for the four independent storage rings including two light sources. The high availability and reliability of control system is strongly required for the long-term stable beam operation under such complex operation schemes. In this presentation, we will describe the control system upgrade plan and status.

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MOPHA060

Feasibility Study on Measurement and Control of Relative Positioning for Nano-beam Collision

laser, alignment, acceleration, superconducting-magnet

933

H. Matsunaga, H. Yoshioka
Takenaka Corporation, Institute of Technology, Chiba, Japan
M. Masuzawa, Y. Ohsawa, R. Sugahara, H. Yamaoka
KEK, Ibaraki, Japan

In the SuperKEKB and future International Linear Collider project, it is required to measure and control an offset of very small beams with a precision of several nanometers at the interaction point. This paper is a feasibility study on measuring and controlling nano-order relative position by using a laser interferometer and a piezoelectric stage. The first part shows that the precision of measurement position about a direction of laser radiation is less than or equal to 1 nanometer in frequency region less than 100Hz. The second part is discussed a measurement of relative displacement between two points which are 10 meter away on substructures located at the interaction point in the SuperKEKB. To compare with difference of accelerometers for reference, a relative displacement measurement with a precision of several nanometers by a laser interferometer became clear. The final part is discussed a relative positioning control by using a Piezo-Stage between two points on active vibration isolation tables. We achieved to control a relative displacement below 2 nanometers in frequency region less than 10Hz.

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MOPTY006

Study on the Injection Beam Commissioning Software for CSNS/RCS

injection, software, interface, linac

950

M.Y. Huang, L. Huang, W.B. Liu, J. Qiu, S. Wang
IHEP, Beijing, People's Republic of China

Funding: Funding Agency: Work supported by National Natural Science Foundation of China (11205185, 11175020, 11175193 )
The China Spallation Neutron Source (CSNS) accelerator uses H⁻ stripping and phase space painting method of filling large ring acceptance with the linac beam of small emittance. The beam commissioning software system is the key part of CSNS accelerator. The injection beam commissioning software for CSNS contains three parts currently: painting curve control, injection beam control and injection orbit correction. The injection beam control contains two subsections: single bunch beam calculation and LRBT beam control at the foil. The injection orbit correction also contains two subsections: injection orbit correction by the calculation and injection trim power control.

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MOPTY012

Design and Test of Prototype of LLRF System for KIPT Neutron Source LINAC

LLRF, linac, EPICS, FPGA

959

X.P. Ma, Y.L. Chi, R.L. Liu
IHEP, Beijing, People's Republic of China
S. Shu
Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing, People's Republic of China

A 100 MeV/100 kW electron LINAC is being constructed by IHEP, China for the NSC KIPT Neutron Source project in Ukraine. A LLRF system is required to produce the driver RF input of the klystron and maintain the accelerating phase and amplitude stability of the machine. The LLRF system consists of an RF reference distribution system, six identical control units, and the fast RF interlock module. The main part of control unit is the PXI-bus crate implemented with PXI9846 - 4 ADC digitizer board and ICS572 - high speed 2 ADC/2 DAC signal process board. An EPICS IOC based on WinDriver as the PCI device driver is developed and tested. Preliminary results show phase detect resolution of 0.03 degree (rms) of 2856 MHz signal has been achieved.
*Mail Address: maxp@ihep.ac.cn

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MOPTY013

Control System for DC-SRF Photo-Injector at Peking University

laser, SRF, LLRF, cryomodule

962

L.W. Feng, J.K. Hao, S. Huang, L. Lin, K.X. Liu, S.W. Quan, F. Wang, B.C. Zhang
PKU, Beijing, People's Republic of China

A control system has been designed and constructed to full-fill the operation requirement of the DC-SRF photo injector developed at Peking University. The system includes FPGA based low level radio frequency (LLRF) control system, PLC based machine protection system, VME based magnet power control, and PC based EPICS IOC. All these systems were integrated to support the stable operation of the DC-SRF photo injector and has shown their robustness. The LLRF system was optimized and tuned for 2K CW/Pulse operation and the stability of amplitude and phase achieves 0.1% and 0.1° respectively.

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MOPTY015

Beam Compression Dynamics and Associated Measurement Methods in Superconducting THz Source

simulation, space-charge, gun, electron

969

Z. Zhou, Y.-C. Du, W.-H. Huang
TUB, Beijing, People's Republic of China

To ensure the quality of high brightness electron beams needed by the terahertz FEL facility at China academy of engineering physics(CAEP), which aims to obtain 100 to 300 terahertz light, a feed-back control system is required to monitor the amplitude and phase jittering by measuring beam arrival time as well as bunch length at the site of the beam position monitor(BPM). In this paper, we make an idealized model of injector section and deduce analytic expressions of bunch arrival time and bunch length. In consideration of the space charge effect on bunch lengthening, bunch arrival time and bunch length as a function of DC gun voltage, buncher field amplitude and buncher phase is carefully calibrated by means of particle in cell (PIC) simulation. With the time and space resolution of the BPM, the control accuracy of phase is estimated to be 0.01 degree, while the amplitude is 0.04%.

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MOPTY038

NSLS-II Digital RF Controller Logic and Applications

cavity, EPICS, FPGA, feedback

1010

B. Holub, F. Gao, J.G. Kulpin, C. Marques, J. Oliva, J. Rose, N.A. Towne
BNL, Upton, New York, USA

The National Synchrotron Light Source II accelerator consists of the Storage Ring, the Booster Ring, and Linac along with their associated cavities. NSLS II is committed to the use of digital RF controllers for controlling these cavities. Given the number, types and variety of functions of these cavities, we sought to limit the logic development effort by reuse of parameterized code on one hardware platform. Currently we have fielded six controllers in the NSLS II system. There are two controllers each in both the Storage ring and Booster. The first controller in each is used to control the cavity field and the second controller used for diagnostics. In the Linac a controller is provided which modulates the eGUN grid to generate the bunches. Lastly, in the Master Oscillator Distribution System a controller is used to make phase corrections to the outgoing master oscillator clock signal to account for thermal phase drifts along the distribution path.

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MOPTY039

Compact Single Pass BPM

software, FPGA, instrumentation, pick-up

1013

M. Žnidarčič, M. Cargnelutti, E. Janezic
I-Tech, Solkan, Slovenia

Monitoring and subsequent optimization of linacs and beam transfers requires specific instrumentation for beam position data acquisition and processing. Compact single pass BPM is the newly developed prototype intended for position and charge monitoring in classical single-multi bunch operation linacs and transfer lines. Flexibility of the instrument enables the installation on electron and proton single pass machines. The motivation, processing principles and first results are presented.

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MOPTY040

Hadron BPM for the FAIR Project

hadron, instrumentation, interface, diagnostics

1016

M. Žnidarčič, E. Janezic, P. Leban
I-Tech, Solkan, Slovenia
K. Lang
GSI, Darmstadt, Germany

The accelerators of the Facility for Anti-proton and Ion Research are designed to deliver stable and rare isotope beams covering a huge range of intensities and beam energies. FAIR will employ heavy ion synchrotrons for highest intensities, anti-proton and rare isotope production stations, high resolution separators and several storage rings where beam cooling can be applied. Instrumentation Technologies will develop and deliver a beam diagnostic system for SIS100, HESR and CR rings. Furthermore the beam transfers will be equipped with the beam position diagnostics. The project is on schedule and the first instrument prototypes are already being under evaluation. This article discusses the new BPM electronics concept, the tests performed in the laboratory and the performance obtained.

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MOPTY043

Update on the Development of the New Electronic Instrumentation for the LIPAc/IFMIF Beam Position Monitors

timing, electronics, operation, EPICS

1025

A. Guirao, D. Jiménez-Rey, L.M. Martinez Fresno, E. Molina Marinas, J. Mollá, I. Podadera, I. Rivera
CIEMAT, Madrid, Spain

Funding: This work has been funded by the Spanish Ministry of Economy and Competitiveness under the project FIS2013-40860-R and the Agreement as published in BOE, 16/01/2013, page 1988
Among all the LIPAc/IFMIF accelerator diagnostics instrumentation, the Beam Position Monitors (BPMs) are a cornerstone for its operation. An electronics system centered on self-calibration and extraction of beam phase information for Time Of Flight measurement is proposed for the twenty BPM stations distributed along the accelerator. The system under development is a fully digital instrumentation which incorporates automatic calibration of the monitors' signals and allows monitoring of both fundamental and second signal harmonics. The current state of the development and first experimental results of the system on the test bench will be presented.

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MOPTY046

Personnel Safety Systems for the European Spallation Source

radiation, PLC, target, neutron

1036

S.L. Birch, A. Nordt, D. Paulic
ESS, Lund, Sweden

Providing and assuring safe conditions for personnel is a key parameter required to operate the European Spallation Source (ESS). The ESS will be responsible for developing all of the facility personnel safety related systems. All of these systems will be developed by the Integrated Control Systems Division (ICS) and all will be designed, manufactured, commissioned and operated in accordance with the IEC61508 standard, with regard to functional safety for Electrical/Electronic and Programmable Electronic (E/E/PE) safety related systems. This paper describes the ESS Personnel safety system’s scope, strategy, initial design requirements, and methodology but also provides an update of the system design progress so far.

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MOPTY048

Machine Protection Strategy for the ESS

operation, neutron, proton, target

1042

A. Nordt, T. Friedrich, T. Korhonen
ESS, Lund, Sweden
C. Hilbes
ZHAW, Winterthur, Switzerland

The ESS proton beam power of 125MW per pulse (5MW average) will be unprecedented and its uncontrolled release could lead to serious damage of equipment within a few microseconds only. To optimize the operational efficiency of the ESS facility allowing for very high beam availability with high reliability towards the end-users, accidents should be avoided and interruptions of beam operation have to be rare and limited to a short time. Finding the right balance between efficient protection of equipment from damage and high beam availability is the key idea on which the ESS Machine Protection Strategy is being based on. Implementing and realizing the measures needed to provide the correct level of machine protection in case of a complex facility like the ESS, requires a systematic approach, which will be discussed in this paper. A method of how to derive machine protection relevant requirements and how to assure completeness of these will be outlined as well.

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MOPTY060

Pulse Compressor Phase and Amplitude Modulation Based on Iterative Learning Control

klystron, operation, linac, experiment

1076

A. Řežaeizadeh, R. Kalt, T. Schilcher
PSI, Villigen PSI, Switzerland
R. Smith
Automatic Control Laboratory, ETH Zurich, Zurich, Switzerland

This paper presents an alternative way to produce flat-topped RF pulses at the pulse compressor output. Flat-topped RF pulses are suitable for multi-bunch operation where it is often required that beams experience the same accelerating gradient. Moreover, the energy gain, in this case, is less sensitive to timing jitters. The proposed approach is based on Iterative Learning Control technique, which iteratively updates the input waveforms, in order to generate the desired output waveforms.

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MOPTY061

Beam-Based Power Distribution Over Multiple Klystrons in a Linear Accelerator

klystron, high-voltage, linac, LLRF

1079

A. Řežaeizadeh, R. Kalt, T. Schilcher
PSI, Villigen PSI, Switzerland
R. Smith
Automatic Control Laboratory, ETH Zurich, Zurich, Switzerland

A linear accelerator including several klystron driver RF stations can be viewed as a single virtual RF station with a certain accelerating RF voltage (in amplitude and phase). This paper develops an optimization scheme that, for a specified beam energy gain, determines the klystrons output powers and the modulators high voltages optimally. The algorithm employs the klystron nonlinear static characteristics curves to calculate the input RF amplitude of the drive chain.
A. Řežaeizadeh, et al, Model-based klystron linearization in the SwissFEL test facility, 36th International Free Electron Laser Conference, Basel, Switzerland

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MOPTY062

The Energy Saving Processes for Utility System in TPS

experiment, operation, photon, factory

1082

C.S. Chen, W.S. Chan, J.-C. Chang, Y.C. Chang, Y.-C. Chung, C.W. Hsu, C.Y. Liu, Z.-D. Tsai
NSRRC, Hsinchu, Taiwan

There are more and more non-linear electronic equipments such as inverters using in facility nowadays. These non-linear electronic equipments let us achieve energy saving, but induce other electrical pollution to the whole power grid in contrast. Among these electrical pollutions, electric harmonic is the most common and harmful to power facility. Therefore, how to monitor the electrical noises from these non-linear equipments becomes an important issue. In this article, a set of power quality monitoring system based on FPGA (Field-Programmable Gate Arrays) modules and PAC (Programmable Automatic Controller) has been built because of their programmability and fast processing speed. By using this monitoring system, any abnormality in power system and its spectrum will be recorded thoroughly. On the other hand, the maintainer could follow the trace of noise and then propose a suitable solution to eliminate the electrical interference too.

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MOPTY063

The Flexible Customized Supervisor and Control System for Utility in TPS

network, operation, monitoring, vacuum

1085

C.S. Chen, W.S. Chan, J.-C. Chang, Y.C. Chang, Y.-C. Chung, C.W. Hsu, C.Y. Liu, Z.-D. Tsai
NSRRC, Hsinchu, Taiwan

In order to maintain and operate a synchrotron radiation light source well requires quite a few efforts. All parts of the big machine, including vacuum system, all kinds of magnets, RF facility, cryogenic equipments, radiation security, optic devices and utility equipment must cooperate in harmony to provide high quality light. Any one of the above system contains lots of analog or digital signal transmission, not to mention the vast range of utility. Numbers of programmable automation controllers (PACs) are applied in utility system in TPS to ensure the utility operates normally. In addition to the high reliability and distribution, the flexible programmability of PAC is the most critical feature in this project. A well-designed program, Archive Viewer, provides a platform for showing these big data from all distributed systems. The architecture of the server system for utility is described in this paper as well.

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MOPTY064

Compensation Strategies for Ramping Waveform of TPS Booster Synchrotron Main Power Supplies

power-supply, dipole, booster, quadrupole

1088

P.C. Chiu, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, K.-B. Liu, B.S. Wang, C.Y. Wu
NSRRC, Hsinchu, Taiwan

Booster synchrotron for the Taiwan photon source project which is a 3 GeV synchrotron light source constructed at NSRRC is in commissioning. The booster is designed to ramp electron beams from 150 MeV to 3 GeV in 3 Hz therefore the large main power supplies have features of waveform play with trigger functionalities to enable electron beams ramp from 150 MeV to 3 GeV in 3 Hz. However, due to limited bandwidth of power supplies, different magnet loading will result in quite different phase lag for dipoles and four quadrupoles families. To improve tracking error between quadrupole to dipole readings, several strategies are developed and will be summarized in this report.

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MOPTY069

Control Interface and Functionality of TPS Booster Power Supply

power-supply, booster, dipole, quadrupole

1094

C.Y. Wu, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Huang, D. Lee, C.Y. Liao
NSRRC, Hsinchu, Taiwan

The TPS booster is a synchrotron with injection energy at 150 MeV and extraction energy at 3 GeV in 3 Hz. Booster main power supplies consist of one dipole power supply with maximum current 1200 Ampere and four quadrupole family power supplies with maximum current of 120/150 Ampere. The small power supply for booster corrector and sextupole is a low noise switching power supply with ± 10 Ampere current range. The TPS booster control environment is based on EPICS framework to support rich functionalities including power supply control, waveform management, operation supports, and so on. All power supplies support DC mode and 3 Hz ramping mode operation for TPS booster commissioning and operation. Efforts on control interface and functionality for TPS booster power supply will be summarizes.

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MOPTY070

Online RadFET Reader for Beam Loss Monitoring System

EPICS, network, interface, radiation

1097

C.H. Huang, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, D. Lee, C.Y. Wu
NSRRC, Hsinchu, Taiwan

To investigate the beam loss and its distribution during operation of synchrotron light sources at NSSRC, a sixteen-channel readout box is designed and implemented to read the threshold voltage of the RadFETs installed at accelerator tunnel. To simplify the design, the reader plays a role of remote I/O for EPICS IOC. The IOC collects voltage from readers distributed in the accelerator to deduce the integrated dose and dose rate. User interface is shown in the control console for real-time display and the archived data are processed off-line.

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MOPTY071

FPGA Based Global Orbit Feedback in the Taiwan Light Source

feedback, FPGA, interface, brilliance

1100

C.H. Kuo, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, D. Lee
NSRRC, Hsinchu, Taiwan

The global orbit feedback for the 1.5 GeV electron storage ring of TLS has been operated more than ten years. This system uses general processors to control feedback loop with 1 kHz rate. It is very important for various operation of storage ring now, but some hardware components could have been out of stock in the future. As a prototype, a FPGA based fast global orbit feedback at a 10 kHz data acquisition rate has been developed. A micro-TCA liked platform with FPGA board is used to implement control algorithm and acquire BPM data from Libera Brillance. The correction algorithm is written in VHDL and connected to power supply with AURORA digital links. The system architecture will be discussed in this report.

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MOPTY072

Beam Loss Study of TLS Using RadFETs

injection, radiation, storage-ring, booster

1103

C.H. Huang, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, D. Lee, C.Y. Wu
NSRRC, Hsinchu, Taiwan

To realize the beam loss during the operation of Taiwan light source, P-type radiation-sensing field-effect transistors are setup around the storage ring. A sixteen-channel readout box is used to read the threshold voltage of the radiation-sensing field-effect transistors during irradiation. The beam loss distribution and mechanism at the injection period, decay mode and top up injection for routing operation will be studied in this report.

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MOPTY076

Development of EPICS Applications for the Taiwan Light Source

EPICS, interface, GUI, framework

1116

Y.-S. Cheng, J. Chen, P.C. Chiu, K.T. Hsu, C.H. Huang, C.Y. Liao
NSRRC, Hsinchu, Taiwan

The TLS (Taiwan Light Source) is a third generation of synchrotron light source, and it has been operated since 1993. The TLS control system is a proprietary design. It was performed minor upgrade several times to avoid obsolete of some system components and keep up-to-date during last two decades. The control system of the TPS project (Taiwan Photon Source) is based upon the EPICS framework. To save resources for TLS control system maintenance, adopt EPICS for newly developed and rejuvenated subsystems for some of the TLS control interfaces includes BPM system, insertion devices, bunch-by-bunch feedbacks, electronics instruments interface and so on. Some EPICS related applications have been developed, and EPICS graphical user interface is also operated at the TLS control consoles environment normally. Current system allowed two kinds of control environments working together. The efforts will be described at this report.

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MOPTY077

Control Interface of Pulse Magnet Power Supply for TPS Project

EPICS, kicker, power-supply, injection

1120

C.Y. Wu, J. Chen, Y.-S. Cheng, C.-S. Fann, K.T. Hsu, S.Y. Hsu, K.H. Hu, C.H. Huang, D. Lee, C.Y. Liao, K.-K. Lin
NSRRC, Hsinchu, Taiwan

The TPS (Taiwan Photon Source) is low emittance 3 GeV synchrotron light source. The design and implementation of a pulse magnet power supply control system for beam injection and extraction were done. The EPICS embedded programmable logic controller (PLC) was applied to control pulse magnet power supply. The system comprises various input/output modules and a CPU module with built-in Ethernet interface. The control information (status of the power supply, ON, OFF, warn up, reset, reading/setting voltage, etc.) can be accessed remotely using EPICS client tools. The TPS timing system provide trigger signals for pulse magnet power supplies. The Ethernet-based oscilloscope is employed to observe current waveform of pulse magnet power supply with EPICS support. This paper describes control interface and operation GUI for the TPS pulse magnet power supply.

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MOPWI011

Beam Stability R&D for the APS MBA Upgrade

feedback, diagnostics, insertion, insertion-device

1167

N. Sereno, N.D. Arnold, H. Bui, J. Carwardine, G. Decker, L. Emery, R.I. Farnsworth, R.T. Keane, F. Lenkszus, R.M. Lill, R. Lipa, S. Veseli, S. Xu, B.X. Yang
ANL, Argonne, Ilinois, USA

Funding: Results shown in this report result from work performed at Argonne National Laboratory operated by UChicago Argonne, LLC, for the U.S. Department of Energy under contract DE-AC02-06CH11357.
Beam diagnostics required for the APS MBA are driven by ambitious beam stability requirements. The major AC stability challenge is to correct rms beam motion to 10% the rms beam size at the insertion device source points from 0.01 to 1000 Hz. The vertical plane represents the biggest challenge for AC stability which is required to be 400 nm rms for a 4 micron vertical beam size. Long term drift over a period of 7 days is required to be 1 micron or less. Major diagnostics R&D components are improved rf beam position processing using commercially available fpga based bpm processors, new XRay beam position monitors sensitive only to hard X-rays, mechanical motion sensing and remediation to detect and correct long term drift and a new feedback system featuring a tenfold increase in sampling rate and a several-fold increase in the number of fast correctors and bpms. Feedback system development represents a major effort and we are pursuing development of a novel algorithm that integrates orbit correction for both slow and fast correctors down to DC simultaneously. Finally a new data acquisition system (DAQ) is being developed to acquire streaming data from all diagnostics.

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MOPWI013

Control System for the LCLS-II Undulator Prototype

undulator, interface, FPGA, monitoring

1173

J.Z. Xu, R.I. Farnsworth, N.O. Strelnikov, I. Vasserman
ANL, Argonne, Ilinois, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357
The Linac Coherent Light Source (LCLS) has been successfully operated for more than 6 years. In order to expand the capability and capacity of the LCLS, LCLS-II has been planned and funded by the Department of Energy. The Advanced Photon Source (APS) at Argonne National Laboratory is tasked with building the prototype of the LCLS-II undulator based on the concept of magnetic force dynamic compensation. The control system for the prototype is responsible for four motion and feedback channels with sub-micron-level accuracy, eight load cells that monitor the forces that act on the system in real time, and multiple temperature sensors. A detailed description of the control system and its operation is reported.

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MOPWI021

The LCLS-II LLRF System

cavity, LLRF, cryomodule, linac

1195

C. Hovater, R. Bachimanchi
JLab, Newport News, Virginia, USA
S. Babel, B. Hong, D. Van Winkle
SLAC, Menlo Park, California, USA
B.E. Chase, E. Cullerton, P. Varghese
Fermilab, Batavia, Illinois, USA
L.R. Doolittle, G. Huang, A. Ratti, C. Serrano
LBNL, Berkeley, California, USA

Funding: This work was supported by the LCLS-II Project and the U.S. Department of Energy, Contract DE-AC02-76SF00515.
The SLAC National Accelerator Laboratory is planning an upgrade (LCLS-II) to the Linear Coherent Light Source with a 4 GeV CW superconducting (SCRF) linac. The SCRF linac consists of 35 ILC style cryomodules (eight cavities each) for a total of 280 cavities. Expected cavity gradients are 16 MV/m with a loaded QL of ~ 4x10⁷. The RF system will have 3.8 kW solid state amplifiers driving single cavities. To ensure optimum field stability a single source single cavity control system has been chosen. It consists of a precision four channel cavity receiver and RF stations (Forward, Reflected and Drive signals). In order to regulate the resonant frequency variations of the cavities due to He pressure, the tuning of each cavity is controlled by a Piezo actuator and a slow stepper motor. In addition the system (LLRF-amplifier-cavity) is being modeled and cavity microphonic testing has started. This paper describes the LLRF system under consideration, including recent modeling and cavity tests.

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MOPWI027

Open XAL Control Room Experience

software, optics, operation, Windows

1214

C.P. Chu, D.G. Maxwell, Y. Zhang
FRIB, East Lansing, Michigan, USA
C.K. Allen, T.A. Pelaia II, A.P. Shishlo
ORNL, Oak Ridge, Tennessee, USA

Funding: This material is based upon work supported by the U.S. Department of Energy under Cooperative Agreement DE-SC0000661 and DE-AC05-00OR22725, the State of Michigan and Michigan State University.
This paper reports the control room experience, lessons learned, and quick deployment approach for the Open XAL application environment. Open XAL is a java-based framework for building high-level accelerator applications, it is a major revision of the XAL framework which was developed at the Spallation Neutron Source (SNS). Open XAL is site neutral and may be deployed at multiple accelerator facilities. Currently, Open XAL is installed at SNS and at the Re-Accelerator facility of Michigan State University. At SNS we are in the final process of replacing the old XAL environment with Open XAL; we describe the upgrade process and our accelerator operations experience using Open XAL. At Michigan State, Open XAL has been tested during a cryomodule commissioning and result will be shown.

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MOPWI028

Initial Experimental Results of a Machine Learning-Based Temperature Control System for an RF Gun

gun, cavity, monitoring, network

1217

A.L. Edelen, S. Biedron, S.V. Milton
CSU, Fort Collins, Colorado, USA
B.E. Chase, D.J. Crawford, N. Eddy, D.R. Edstrom, E.R. Harms, J. Ruan, J.K. Santucci, P. Stabile
Fermilab, Batavia, Illinois, USA

Colorado State University (CSU) and Fermi National Accelerator Laboratory (Fermilab) have been developing a control system to regulate the resonant frequency of an RF electron gun. As part of this effort, we present experimental results for a benchmark temperature controller that combines a machine learning-based model and a predictive control algorithm for improved settling time, overshoot, and disturbance rejection relative to conventional techniques. Such improvements have implications for machine up-time and management of reflected power. This work is part of an on-going effort to develop adaptive, machine learning-based tools specifically to address control challenges found in particle accelerator systems.

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MOPWI034

Adaptive Accelerator Tuning

DTL, feedback, hardware, simulation

1237

A. Scheinker
LANL, Los Alamos, New Mexico, USA

We start with an overview of advanced adaptive control schemes in use throughout the accelerator community. We then present a recently developed, novel, model-independent feedback controller*, which is robust to measurement noise, and able to tune an arbitrary number of coupled parameters simultaneously based only on a user-defined cost function. We discuss the possibility of combining virtual beam measurements from simulations with actual diagnostic signals from the accelerator into a single cost function, which takes into account both unknown machine variations and estimates of physically inaccessible beam characteristics. We present recent in-hardware experimental results obtained at the Los Alamos Neutron Science Center** and at the Facility for Advanced Accelerator Tests (FACET)***, demonstrating the scheme’s ability to simultaneously tune many parameters and its robustness to noise and system time-variation.
* A. Scheinker et al., PRSTAB, 16, 102803, 2013.
** A. Scheinker et al., NIMA, 756, pp. 30-38, 2014.
*** A. Scheinker and S. Gessner, Conference on Decision and Control, 2014.

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MOPWI037

Upgrade and Operation of the Demonstration 4 GS/Sec. Intra-Bunch Instability Control System for the SPS

feedback, kicker, pick-up, FPGA

1246

J.E. Dusatko, J.D. Fox, C.H. Rivetta, O. Turgut
SLAC, Menlo Park, California, USA
W. Höfle
CERN, Geneva, Switzerland

Funding: Work supported by the U.S. Department of Energy under contract # DE-AC02-76SF00515 and the US LHC Accelerator Research Program (LARP).
We present the expanded system implementation and operational experience details for the “Demo” technology platform commissioned at the SPS in January 2015. The system has been expanded during the LS1 shutdown with added features. The upgraded system has enhanced performance and more robust synchronization to the beam and accelerator timing system. Central to the new features are 1 GHz bandwidth kickers and RF amplifiers (including associated equalizers) which allow excitation and control of higher modes within the 2 ns bunch. We highlight the expanded features, and present their details.

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MOPWI041

Identification of Intra-Bunch Transverse Dynamics for Model Based Wideband Feedback Control at CERN Super Proton Synchrotron

feedback, simulation, proton, synchrotron

1249

O. Turgut, J.E. Dusatko, J.D. Fox, C.H. Rivetta
SLAC, Menlo Park, California, USA
W. Höfle
CERN, Geneva, Switzerland

Funding: Work supported by the U.S. Department of Energy under contract DE-AC02-76SF00515 and the US LHC Accelerator Research program (LARP).
Multi-input multi-output (MIMO) feedback design techniques can be helpful to stabilize intra-bunch transverse instabilities induced by electron-clouds or transverse mode couplings at the CERN Super Proton Synchrotron (SPS). These MIMO techniques require a reduced order model of intra-bunch dynamics. We estimate a linear reduced order MIMO models for transverse intra-bunch dynamics and use these models to design model based MIMO feedback controllers. The effort is motivated by the plans to increase currents in the SPS as part of the HL-LHC upgrade. Parameters of the reduced order models are estimated based on driven beam SPS measurements. We study different types of controllers. We test the model based designs using macro particle simulation codes (CMAD and HEADTAIL) and compare its performance with FIR filters tested during beam measurements of the feedback system in SPS machine development (MD) studies.

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MOPWI044

Beamline Insertions Manager at Jefferson Lab

software, hardware, EPICS, operation

1253

M.C. Johnson
JLab, Newport News, Virginia, USA

Funding: This manuscript has been authored by Jefferson Science Associates, LLC under Contract No. DE-AC05-06OR23177 with the U.S. Department of Energy.
The beam viewer system at Jefferson Lab provides operators and beam physicists with qualitative and quantitative information on the transverse electron beam properties. There are over 140 beam viewers installed on the 12 GeV CEBAF accelerator. This paper describes an upgrade consisting of replacing the EPICS based system tasked with managing all viewers with a mixed system utilizing EPICS and high level software. Most devices, particularly the beam viewers, cannot be safely inserted into the beam line during high-current beam operations. Software is partly responsible for protecting the machine from untimely insertions. The multiplicity of beam-blocking and beam-vulnerable devices motivate us to try a data-driven approach. The beamline insertions application components are centrally managed and configured through an object-oriented software framework created for this purpose. A rules-based engine tracks the configuration and status of every device, along with the beam status of the machine segment containing the device. The application uses this information to decide on which device actions are allowed at any given time.

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MOPWI045

The CEBAF Element Database and Related Operational Software

database, hardware, software, cavity

1256

T. L. Larrieu, M.E. Joyce, M. Keesee, C.J. Slominski, R.J. Slominski, D.L. Turner
JLab, Newport News, Virginia, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
The newly commissioned 12 GeV CEBAF accelerator relies on a flexible, scalable and comprehensive database to define the accelerator. This database delivers the configuration for CEBAF operational tools, including hardware checkout, the downloadable optics model, control screens, and much more. The presentation will describe the flexible design of the CEBAF Element Database (CED), its features and assorted use case examples.

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MOPWI046

eDT and Model-based Configuration of 12 GeV CEBAF

operation, radiation, linac, synchrotron

1259

D.L. Turner
JLab, Newport News, Virginia, USA

Funding: Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
This poster will discuss model-driven setup of CEBAF for the 12GeV era, focusing on the elegant Download Tool (eDT). eDT is a new operator tool that generates magnet design setpoints for various machine energies and pass configurations. eDT was developed in the effort towards a process for reducing machine configuration time and reproducibility by way of an accurate accelerator model.

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MOPWI048

Open XAL Build System

site, database, interface, software

1265

T.A. Pelaia II
ORNL, Oak Ridge, Tennessee, USA

Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725
Open XAL is an accelerator physics software platform developed in collaboration among several facilities around the world. The build system is implemented through Apache Ant build files and features zero configuration simplicity based on directory patterns. These directory patterns allow for correctly building the Open XAL environment including the core and site specific applications, services, extensions, plugins and resources. Options are available for deployment and custom application packaging. This paper describes the Open XAL build rules, options and workflows.

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TUAC2

Wideband Vertical Intra-Bunch Feedback At The SPS - 2015 Results And Path Forward

feedback, kicker, simulation, optics

1353

C.H. Rivetta, J.E. Dusatko, J.D. Fox, O. Turgut
SLAC, Menlo Park, California, USA
S. De Santis
LBNL, Berkeley, California, USA
W. Höfle
CERN, Geneva, Switzerland

Funding: Work supported by the U.S. Department of Energy under contract # DE-AC02-76SF00515 and the US LHC Accelerator Research Program (LARP)
We present experimental measurements taken from CERN SPS machine development studies with a wideband intra-bunch feedback channel prototype. The demonstration system is a digital processing system with recently installed wideband kicker and amplifier components. This new hardware extends the bandwidth up to 1GHz and allows driving and controlling multiple vertical transverse modes in the bunch. The studies are focused on both driving the bunch with spectrally controlled signals to identify a reduced model of the bunch dynamics and testing model-based feedback controllers to stabilize the bunch dynamics. The measurements are structured to validate reduced MIMO models and macro-particle simulation codes, including the dynamics and limits of the feedback channel. Noise effects and uncertainties in the model are evaluated via SPS measurements to quantify the limits of control techniques applied to stabilize the intrabunch dynamics. The design of controllers for Q26 and Q20 optics are illustrated and future control developments are described.

Slides TUAC2 [30.936 MB]

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TUPWA004

Operator Roles at the Australian Synchrotron

operation, synchrotron, database, storage-ring

1397

D.C. McGilvery
ASCo, Clayton, Victoria, Australia
G. LeBlanc
SLSA, Clayton, Australia

The Accelerator Operators at the Australian Synchrotron undertake a wide variety of critical functions as part of their regular duties. In addition to normal Control Room duties, they play a major Role in Machine Physics, provide after hours support for Users on Beamlines and contribute extensively to the Controls and Database Development across the facility.

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TUPWA037

Statistical Optimization of FEL Performance

quadrupole, FEL, simulation, alignment

1496

I.V. Agapov, G. Geloni
XFEL. EU, Hamburg, Germany
I. Zagorodnov
DESY, Hamburg, Germany

Modern FEL facilities such as the European XFEL will serve large number of users, thus understanding and optimizing their performance parameters such as the output power is important. In this work we describe the statistical approach to such optimization under assumption that the possibility of modelling is limited by uncertainties. We present results of such statistical optimization of SASE radiation power for FLASH and discuss how the results of such empirical tuning can be fed back into the model used in simulations

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TUPJE032

Updates of the PAL-XFEL Undulator Program

undulator, background, FEL, electron

1675

D.E. Kim, M.-H. Cho, Y.-G. Jung, H.-S. Kang, I.S. Ko, H.-G. Lee, S.B. Lee, W.W. Lee, B.G. Oh, K.-H. Park, H.S. Suh
PAL, Pohang, Kyungbuk, Republic of Korea
S. Karabekyan, J. Pflüger
XFEL. EU, Hamburg, Germany

Pohang Accelerator Laboratory (PAL) is developing a 0.1 nm SASE based FEL based on 10 GeV S-band linear accelerator named PAL-XFEL. At the first stage, PAL-XFEL needs two undulator lines for photon source. The hard X-ray undulator line requires 18 units of 5 m long hybrid-type conventional planar undulator and soft X-ray line requires 6 units of 5 m long hybrid type planar undulator with additional few EPUs for final polarization control. PAL is developing undulator magnetic structure based on EU-XFEL concepts. The key parameters are min pole gap of 8.3 mm, with period length 26 mm (HXU), 35 mm (SXU), and 5.0 m magnetic length. . In this report, the prototyping, and the development of pole tuning procedure, the impact of the background field error, and the effects of the girder bending on the optical phase error will be presented.

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TUPJE036

A New Bench Concept for Measuring Magnetic Fields of Big Closed Structures

operation, vacuum, synchrotron, alignment

1690

J. Campmany, F. Becheri, C. Colldelram, J. Marcos, V. Massana, J. Nicolás, L. Ribó
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

The measurement of big closed magnetic structures is becoming a challenge of great interest. The main reason is the tendency towards building accelerators with high magnetic fields produced by small gap magnets, as well as the development of cryogenic or superconducting narrow-gap insertion devices. Usual approach, based on side-measurements made with a Hall probe mounted on the tip of a motorized arm based on a long granite bench is no more applicable to such closed structures. So, new concepts and approaches have been developed, mainly based on complex devices that insert a Hall probe inside the magnetic structure maintaining the desired position by close-loop controls. The main problem of these devices is that they are not general-purpose oriented: they need a special vacuum chamber, require a specific geometry of the magnetic structure, or does not provide 3D field-map measurements. We present in this paper a new bench that has been built at ALBA synchrotron that is simple, multi-purpose and can be a general solution for measuring big closed structures.

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TUPJE062

First Transparent Realignment Tests at the Diamond Storage Ring

alignment, survey, storage-ring, emittance

1772

M. Apollonio, R. Bartolini, P. Dudin, M. Hoesch, W.J. Hoffman, E.C. Longhi, A.J. Rose, A. Thomson
DLS, Oxfordshire, United Kingdom
R. Bartolini
JAI, Oxford, United Kingdom

The Transparent Realignment of the Diamond Storage Ring is a program of work to improve the mechanical alignment of the machine by carefully moving the magnet girders with a virtually zero impact on the associated beamlines. The girders can be moved by means of a 5-axis motion system under remote control via the EPICS toolkit from the Diamond Control Room. Currently three cells (three girders in each) have been equipped with a permanent protection system to prevent excessive deflection across each of the inter-girder vacuum bellows. The protection and motion systems are installed in the associated Control and Instrumentation Area (CIA). Full commissioning of the motion and protection systems have been completed. Results from the alignment test sessions are hereby reported.

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TUPMA014

Extending OK5 Wiggler Operational Limit at Duke FEL/HIGS Facility

wiggler, FEL, operation, electron

1863

P.W. Wallace, M. Emamian, H. Hao, J.Y. Li, S.F. Mikhailov, V. Popov, Y.K. Wu
FEL/Duke University, Durham, North Carolina, USA
J.Y. Li
USTC/NSRL, Hefei, Anhui, People's Republic of China

Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033
Since 2007 the HIGS facility has been operated to produce both linearly and circularly polarized gamma-ray beams using two FELs, the planar OK-4 FEL and helical OK-5 FEL. Presently, with the OK-5 FEL operating at 192 nm, we can produce circularly-polarized gamma-ray beams between 1 and 100 MeV for user applications. Gamma-ray production between 80 and 100 MeV required an extension of the OK-5 wiggler operation beyond the designed current limit of 3.0 kA. In 2009, we upgraded cooling and machine protection systems to successfully extend OK-5 operation to 3.5 kA. To realize HIGS gamma-ray operation beyond 100 MeV and ultimately toward 150 MeV (the pion-threshold energy), with various limitations of the VUV mirror technology, the OK-5 wigglers will need to be operated at an even higher current, between 3.6 and 4.0 kA. In this paper we present our technical solution to further extend the operation range of the OK-5 wigglers, and report our preliminary results with high-current wiggler operation.

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TUPMA034

Control of Synchrotron Radiation Effects During Recirculation with Bunch Compression

emittance, recirculation, lattice, simulation

1910

D. Douglas, S.V. Benson, R. Li, C. Tennant
JLab, Newport News, Virginia, USA
G.A. Krafft, B. Terzić
ODU, Norfolk, Virginia, USA
C.-Y. Tsai
Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA

Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177.
Studies of beam quality preservation during recirculation * have been extended to generate a design of a compact arc providing bunch compression with positive momentum compaction ** and control of both incoherent and coherent synchrotron radiation (ISR and CSR) effects using the optics balance methods of diMitri et al.***. In addition, the arc/compressor generates very little micro-bunching gain. We detail the beam dynamical basis for the design, discuss the design process, give an example solution, and provide simulations of ISR and CSR effects. Reference will be made to a complete analysis of micro-bunching effects ****.
* D. Douglas et al., these proceedings
** S. Benson et al., these proceedings
*** S. diMitri et al., Phys. Rev. Lett. 110, 014801, 2 January 2013
**** C.Y. Tsai et al., these proceedings

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TUPMA035

Control of Synchrotron Radiation Effects during Recirculation

emittance, recirculation, lattice, synchrotron

1913

D. Douglas, S.V. Benson, A.S. Hofler, R. Kazimi, R. Li, Y. Roblin, C. Tennant
JLab, Newport News, Virginia, USA
G.A. Krafft, B. Terzić
ODU, Norfolk, Virginia, USA
C.-Y. Tsai
Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA

Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177.
Numerous proposals invoke recirculation and/or energy recovery for cost-performance optimization. These often encounter challenges with the beam-quality-degrading effects of incoherent and coherent synchrotron radiation (ISR and CSR). We describe a means of controlling of this degradation. The approach utilizes results by diMitri et al. *, and invokes behavior observed during simulations of the recirculation process. The method is based on the use of periodically isochronous 2nd-order achromats; this not only insures that the conditions for the suppression of CSR-driven emittance growth are met*, it also suppresses micro-bunching gain over a broad range of parameter space **. Details of specific designs will be presented, and a reference to an analysis of micro-bunching effects ** provided. A planned test of the CSR suppression mechanism in CEBAF will be described.
*S. diMitri et al., Phys. Rev. Lett. 110, 014801, 2 January 2013.
**C.Y. Tsai et al., these proceedings.

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TUPMA054

High Level Application for First Turns Commissioning in NSLS-II Storage Ring

software, storage-ring, GUI, lattice

1953

S. Seletskiy, A. Blednykh, J. Choi, Y. Hidaka, B. Podobedov, G. Shen, L. Yang
BNL, Upton, Long Island, New York, USA

The typical problems occurring during commissioning of the first turns in the storage rings include shorted coils or reversed polarity of the magnets, cross-cabling of magnets power supplies and reversed polarity of BPMs. In this paper we describe a dedicated high level control application, which was created and utilized for commissioning of the first turns in NSLS-II storage ring.

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TUPHA005

Tools for NSLS II Commissioning

operation, status, interface, injection

1971

G.M. Wang, G. Bassi, A. Blednykh, W.X. Cheng, J. Choi, L.R. Dalesio, M.A. Davidsaver, J.H. De Long, K. Ha, Y. Hidaka, Y. Hu, Y. Li, D. Padrazo, S. Seletskiy, T.V. Shaftan, G. Shen, K. Shroff, O. Singh, T. Summers, Y. Tian, F.J. Willeke, H. Xu, L. Yang, X. Yang
BNL, Upton, Long Island, New York, USA

The National Synchrotron Light Source II (NSLS-II) is a state of the art 3 GeV third generation light source at Brookhaven National Laboratory. As many facilities worldwide, NSLS II uses the EPICS control system to monitor and control all accelerator hardware. Control system studio (CSS) is used for simple tasks such as monitoring, display, setting of PVs. browsing the historical data, et. al. For more complex accelerator physics applications, a collection of scripts are mainly written in Python and part from Matlab during commissioning. With the close collaboration and fully support from control group, more and more CSS features were developed for operation convenience and several high level applications are interfaced with users in CSS panels for daily use based on softiocs. This paper will present the tools that we have been using for commissioning.

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TUPHA007

NSLS II Booster Extended Integration Test

booster, operation, hardware, diagnostics

1977

G.M. Wang, B. Bacha, A. Blednykh, E.B. Blum, W.X. Cheng, J. Choi, L.R. Dalesio, M.A. Davidsaver, J.H. De Long, R.P. Fliller, G. Ganetis, W. Guo, K. Ha, Y. Hu, W. Louie, T.V. Shaftan, G. Shen, O. Singh, Y. Tian, F.J. Willeke, L. Yang, X. Yang
BNL, Upton, Long Island, New York, USA
P.B. Cheblakov, A.A. Derbenev, A.I. Erokhin, S.E. Karnaev, S.V. Sinyatkin
BINP SB RAS, Novosibirsk, Russia
V.V. Smaluk
DLS, Oxfordshire, United Kingdom

The National Synchrotron Light Source II (NSLS-II) is a state of the art 3 GeV third generation light source at Brookhaven National Laboratory. While the installation activities in the booster-synchrotron are nearly completed and waiting for the authorization to start the booster commissioning, the injector and accelerator physics group have engaged into the Integrated Testing phase. We did the booster commissioning with simulated beam signals, called extended integrated testing (EIT) to prepare for the booster ring commissioning. It is to make sure the device function along with utilities, timing system and control system, to calibrate diagnostics system, debug High Level Applications, test and optimize all the operation screens to reduce the potential problems during booster commissioning with beam.

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TUPHA008

NSLS-II Injector High Level Application Tools

operation, booster, linac, emittance

1980

G.M. Wang, E.B. Blum, R.P. Fliller, Y. Hu, T.V. Shaftan, X. Yang
BNL, Upton, Long Island, New York, USA

The National Synchrotron Light Source II (NSLS-II) is a state of the art 3 GeV third generation light source at Brookhaven National Laboratory. The injection system consists of a 200 MeV linac, a 3 GeV booster synchrotron and transfer lines in connection of linac, booster and storage ring. The transfer lines, designed and built from BNL, are equipped with sufficient diagnostics to commission to characterize the beam parameters from linac and booster. In the paper, we summarized the high level applications tools, beam emittance, energy and energy spread measurement, developed during the injector commissioning.

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TUPTY035

Beam Dynamics Requirements for the Powering Scheme of the HL-LHC Triplet

quadrupole, simulation, optics, dynamic-aperture

2082

M. Fitterer, R. De Maria, S.D. Fartoukh, M. Giovannozzi
CERN, Geneva, Switzerland

Funding: The HiLumi LHC Design Study is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404.
For the HL-LHC, β^* values as small as 15 cm are envisaged as baseline scenario for the high luminosity insertions IR1 and IR5, thus leading to an increase of the maximum beta-functions in the inner triplet (IT). The larger beta-functions in the IT result in a higher sensitivity of the beam to any linear or non-linear, static or dynamic, field imperfections in the IT region. In this paper, we summarize accordingly the tolerances of the triplet power supplies in terms of current ripple, stability and reproducibility. Both the baseline IT powering scheme and other alternative schemes will be presented, the later reducing the tune shift caused by a current modulation and thus weakening its possible impact on the long term stability.

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TUPTY082

Scanning Synchronization of Colliding Bunches for MEIC Project

cavity, ion, electron, collider

2229

Y.S. Derbenev, V.P. Popov
JLab, Newport News, Virginia, USA
Y.D. Chernousov
ICKC, Novosibirsk, Russia
G.M. Kazakevich
Euclid TechLabs, LLC, Solon, Ohio, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contracts No. DE-AC05-06OR23177 and DE-AC02-06CH11357.
Synchronization of colliding beams is one of the major issues of an electron-ion collider (EIC) design because of sensitivity of ion revolution frequency to beam energy. A conventional solution for this trouble is insertion of bent chicanes in the arcs space. In our report we consider a method to provide space coincidence of encountering bunches in the crab-crossing orbits Interaction Region (IR) while repetition rates of two beams do not coincide. The method utilizes pair of fast kickers realizing a bypass for the electron bunches as the way to equalize positions of the colliding bunches at the Interaction Point (IP). A dipole-mode warm or SRF cavities fed by the magnetron transmitters are used as fast kickers, allowing a broad-band phase and amplitude control. The proposed scanning synchronization method implies stabilization of luminosity at a maximum via a feedback loop. This synchronization method is evaluated as perspective for the Medium Energy Electron-Ion collider (MEIC) project of JLab with its very high bunch repetition rate.

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TUPWI004

Status of the TOP-IMPLART Proton LINAC

proton, linac, operation, klystron

2245

P. Nenzi, A. Ampollini, G. Bazzano, F. Marracino, L. Picardi, C. Ronsivalle, V. Surrenti, M. Vadrucci
ENEA C.R. Frascati, Frascati (Roma), Italy
F. Ambrosini
University of Rome La Sapienza, Rome, Italy
F. Ambrosini
Università di Roma "La Sapienza", SAPIENZA-DIET, Roma, Italy
C. Snels
ENEA Casaccia, Roma, Italy

In this work we present the latest update on the TOP-IMPLART LINAC. It is a 150 MeV proton linear accelerator for protontherapy application under realization at ENEA-Frascati in the framework of a project developed by ENEA, the Italian National Institute of Health (ISS) and Regina Elena National Cancer Institute-IFO-Rome. The accelerator consists of a 7 MeV injector operating at 425 MHz followed by a LINAC booster working at 2997.92 MHz at a maximum repetition frequency of 100 Hz. The medium energy section up to 35 MeV is a sequence of four SCDTL modules (Side Coupled Drift Tube LINAC) powered by a single 10 MW klystron: the first module bringing beam energy from 7MeV to 11.6MeV with an input power of 1.3 MW in a 4usec pulse has been successfully commissioned with a 10 uA per pulse beam accelerated at the design energy demonstrating the functionality of low energy proton acceleration at high RF frequency. The effects on beam dynamics, caused by the absence of any harmonic relation between the two operating frequencies of the LINAC has been simulated and experimentally verified during the commissioning activity. The second and third module installation and testing is undergoing.

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TUPWI005

Proton Irradiations of Micro-TOM Red Hairy Roots to Mimic Space Conditions

proton, experiment, radiation, framework

2249

M. Vadrucci, A. Ampollini, G. Bazzano, P. Nenzi, L. Picardi, C. Ronsivalle, V. Surrenti
ENEA C.R. Frascati, Frascati (Roma), Italy
F. Ambrosini
Università di Roma "La Sapienza", SAPIENZA-DIET, Roma, Italy
E. Benvenuto, A. Desiderio, S. Massa, C. Snels, M.E. Villani
ENEA Casaccia, Roma, Italy

Funding: Radiation Sources Laboratory UTAPRAD Department ENEA C.R. Frascati Via E. Fermi, 45 00044 Frascati (RM), Italy ENEA
The purpose of the BIOxTREME project, launched by ENEA and funded by ASI (Italian Space Agency), is to formulate new biological drugs having a stimulant activity on the immune system finalizing the production for a ready to use resource in Bioregenerative Life Support Systems (BLSSs) for space missions with extended durations, in deep space, and with multiple crews. One of the project tasks is to study the effects of physical insults on plants, simulating cosmic environment on production platforms by static magnetic fields, microgravity and ionizing radiation. In order to examine the biological effects, to test plant radio-resistance and to build dose-response curves we carried out proton irradiations of a tomato cultivar Micro-Tom red hairy roots with the TOP-IMPLART accelerator at the ENEA Frascati Research center. The biological samples were placed in a holder specially made in a movable real-time monitoring chamber calibrated in dose. The fluence-homogeneity measurements over the sample and the calibration of the monitoring system were performed using GafChromic EBT3 films. The paper describes the experimental set-up and reports the preliminary results.

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TUPWI006

How Knowledge and Technological Transfer can Develop into an Industrial Reality: Kyma Srl case history

insertion, insertion-device, undulator, operation

2253

R. Geometrante, M. Zambelli
KYMA, Trieste, Italy
M. Zambelli
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

Kyma was established in 2007 as a spin-off company of Elettra-Sincrotrone Trieste, to design, realize and install all the 18 undulators of FERMI, the seeded FEL, at the time being built at the Elettra lab in Trieste, Italy. For Kyma establishment, Elettra-SincrotroneTrieste formally transferred to the new company know-how and references relevant to Insertion Devices and, by a Knowledge Transfer monetarily evaluated, could participate to Kyma capital owning the 51% of the shares. In few years, Kyma became a well-known organization in the light source community. After more than forty Insertion Devices and sixty phase shifters designed and manufactured, Kyma is now recognized as a qualified partner for design and development of this kind of equipment. Some examples of Kyma industrial achievements in developing skills, knowledge, technologies methods of manufacturing transferred by Universities and Institution, will be presented. An example out of many: the joint effort between Kyma and Cornell University right now leading to the development of a new perspective into the ID world, i.e. the CHESS Compact Undulators (CCU).

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TUPWI015

Experience on Serial Production of the Quadrupole Movers with Submicrometric Repeatability for the European XFEL*

quadrupole, hardware, dumping, operation

2271

J. Munilla, J. Calero, L. García-Tabarés, A. Guirao, J.L. Gutiérrez, T. Martínez, E. Molina Marinas, F. Toral, C. Vázquez
CIEMAT, Madrid, Spain
J.A. Gorrotxategi, M. Tarragual
ZEHATZ, Mendaro, Spain
B. Junkera, A. Urzainki
DMP, Mendaro, Spain
C. Martins, E. Ramiro, F. Ramiro
RAMEM, Madrid, Spain

Funding: This work is partially supported by the Spanish Ministry of Science and Innovation under SEI Resolution on 17-September-2009 and Project ref. AIC10-A-000524
CIEMAT is in charge of the design and manufacturing of the quadrupole movers with submicrometric repeatability for the XFEL. EU intersections. Prototyping of these precision devices was successful but manufacturing them in a serial production scheme (101 units) implies some changes at design, fabrication procedures and quality controls. This paper will present some of the main problems and solutions adopted to transform a prototype made at a research facility into a serial production at a conventional industrial company. Also, it describes the inspection and tests, the quality controls and reporting procedures. All the devices have been validated and recepted. This paper describes the adopted procedure and the performance of the serial units.

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TUPWI016

Gantry 3: Further Development of the PSI PROSCAN Proton Therapy Facility

proton, cyclotron, coupling, dipole

2275

A. Koschik
PSI, Villigen, Villigen, Switzerland
C. Bula, J.P. Duppich, A. Gerbershagen, M. Grossmann, J.M. Schippers, J. Welte
PSI, Villigen, Switzerland

PSI and its Center for Proton Therapy (CPT) is extending its research capabilities in the field of proton therapy and pencil beam scanning technology. Gantry 3 will be an additional treatment room at the PROSCAN facility at PSI, Villigen, Switzerland. It will feature a 360 degree scanning Gantry delivered by Varian Medical Systems. The Gantry design is based on Varian technology, which will be combined with advanced PSI active scanning technology. The further development of fast energy switching as well as precise spot and continuous line scanning irradiation modes are main research topics at the PROSCAN facility. A major challenge with Gantry 3 is the link of the existing PSI PROSCAN system with the Varian PROBEAM system, while retaining the system integrity and high performance level. Additionally, Gantry 3 will be installed and commissioned while keeping the other treatment rooms (Gantry 1, Gantry 2, Optis 2) in full operation. The current development and project status is presented.

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TUPWI029

Baseline Scheme for Polarization Preservation and Control in the MEIC Ion Complex

polarization, ion, collider, solenoid

2301

V.S. Morozov, Y.S. Derbenev, F. Lin, Y. Zhang
JLab, Newport News, Virginia, USA
Y. Filatov
MIPT, Dolgoprudniy, Moscow Region, Russia
A.M. Kondratenko, M.A. Kondratenko
Science and Technique Laboratory Zaryad, Novosibirsk, Russia

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357.
The scheme for preservation and control of the ion polarization in the Medium-energy Electron-Ion Collider (MEIC) has been under active development in recent years. The figure-8 configuration of the ion rings provides a unique capability to control the polarization of any ion species including deuterons by means of "weak" solenoids rotating the particle spins by small angles. Insertion of "weak" solenoids into the magnetic lattices of the booster and collider rings solves the problem of polarization preservation during acceleration of the ion beam. Universal 3D spin rotators designed on the basis of "weak" solenoids allow one to obtain any polarization orientation at an interaction point of MEIC. This paper presents the baseline scheme for polarization preservation and control in the MEIC ion complex.

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TUPWI030

Numerical Calculation of the Ion Polarization in MEIC

polarization, collider, solenoid, proton

2304

V.S. Morozov, Y.S. Derbenev, F. Lin, Y. Zhang
JLab, Newport News, Virginia, USA
Y. Filatov
MIPT, Dolgoprudniy, Moscow Region, Russia
A.M. Kondratenko, M.A. Kondratenko
Science and Technique Laboratory Zaryad, Novosibirsk, Russia

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357.
Ion polarization in the Medium-energy Electron-Ion Collider (MEIC) is controlled by means of universal 3D spin rotators designed on the basis of “weak” solenoids. We use numerical calculations to demonstrate that the 3D rotators have negligible effect on the orbital properties of the ring. We present calculations of the polarization dynamics along the collider’s orbit for both longitudinal and transverse polarization directions at a beam interaction point. We calculate the degree of depolarization due to the longitudinal and transverse beam emittances in case when the zero-integer spin resonance is compensated.

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TUPWI048

Experimental Demonstration of an Interaction Region Beam Waist Position Knob for Luminosity Leveling

luminosity, optics, detector, experiment

2357

Y. Hao, Y. Luo, A. Marusic, G. Robert-Demolaize, X. Shen
BNL, Upton, Long Island, New York, USA
M. Bai
FZJ, Jülich, Germany
Z. Duan
IHEP, Beijing, People's Republic of China

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
In this paper, we report on the experimental implementation of the model-dependent control of the interaction region beam waist position (s* knob) at the Relativistic Heavy Ion Collider (RHIC). The s* adjustment provides an alternative way of controlling the luminosity and is the only known method to control the luminosity and to reduce the pinch effect of the future eRHIC. We first demonstrate the effectiveness of the s* knob in luminosity controlling and its application in the future electron ion collider, eRHIC, followed by details of the experimental demonstration of such knob in RHIC.

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WEXC1

Machine and Personnel Protection for High Power Hadron Linacs

linac, radiation, hadron, ion

2418

M. Ikegami
FRIB, East Lansing, Michigan, USA

Machine and personnel safety are increasingly important for high power hadron linacs as involved beam power increases. Design requirements and characteristic features of machine protection system and personnel protection system for operating and proposed high power hadron linacs, such as J-PARC, SNS, FRIB, ESS, and IFMIF, are reviewed.

Slides WEXC1 [9.859 MB]

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WEYC2

Status of the PAL XFEL Construction

undulator, klystron, linac, FEL

2439

H.-S. Kang, K.W. Kim, I.S. Ko
PAL, Pohang, Kyungbuk, Republic of Korea

Funding: This work has been supported by the Ministry of Science, ICT and Future Planning of Korea.
The PAL-XFEL, a 0.1-nm hard X-ray FEL facility consisting of a 10-GeV S-band linac, is being constructed in Pohang, South Korea. Its building construction was completed at the end of 2014. The major procurement contracts were complete for the critical components of S-band linac modules and undulators. The installation of linac, undulator, and beam line will be completed by 2015. The commissioning will get started in January 2016 aiming for the first lasing in 2016. We will report the current status, construction progress, and commissioning plans for the PAL XFEL project, including major subsystem preparations.

Slides WEYC2 [9.069 MB]

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WEPWA066

The Advancement of Cooling Absorbers in COSY Infinity

scattering, simulation, electron, proton

2655

J.D. Kunz
IIT, Chicago, Illinois, USA
M. Berz, K. Makino
MSU, East Lansing, Michigan, USA
P. Snopok
Illinois Institute of Technology, Chicago, Illlinois, USA

Funding: Work is supported by the U.S. Department of Energy.
COSY Infinity is an arbitrary-order beam dynamics simulation and analysis code. It can determine high-order transfer maps of combinations of particle optical elements of arbitrary field configurations. For precision modeling, design, and optimization of next-generation muon beam facilities, its features make it a very attractive code. New features are being developed for inclusion in COSY to follow the distribution of charged particles through matter. To study in detail some of the properties of muons passing through material, the transfer map approach alone is not sufficient. The interplay of beam optics and atomic processes must be studied by a hybrid transfer map–Monte-Carlo approach in which transfer map methods describe the average behavior of the particles in the accelerator channel including energy loss, and Monte-Carlo methods are used to provide small corrections to the predictions of the transfer map accounting for the stochastic nature of scattering and straggling of particles. The advantage of the new approach is that it is very efficient in that the vast majority of the dynamics is represented by fast application of the high-order transfer map of an entire element and accumulated stochastic effects as well as possible particle decay. The gains in speed are expected to simplify the optimization of muon cooling channels which are usually very computationally demanding due to the need to repeatedly run large numbers of particles through large numbers of configurations. Progress on the development of the required algorithms is reported.

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WEPWA070

Considerations for an Efficient Terahertz-driven Electron Gun

electron, acceleration, gun, laser

2664

F. Lemery, P. Piot
Northern Illinois University, DeKalb, Illinois, USA
P. Piot
Fermilab, Batavia, Illinois, USA

We investigate a dispersion-controlled-acceleration scheme of low-energy electrons to mitigate phase slipping using a tapered dielectric lined waveguide (DLW). Our approach matches the velocity of an electron being accelerated in a slab-symmetric structure in a constant electric field. We also present first experimental results of a THz pulse propagating in a slab-symmetric DLW.

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WEPJE002

Photoinjector Improvement and Control by Surface Acoustic Waves

electron, photon, experiment, linac

2678

R.P. Johnson
Muons, Inc, Illinois, USA
A. Afanasev, C.E. Korman
GWU, Washington, USA

A new technique is being developed to enhance the efficiency of photocathodes used for electron sources to improve emission capabilities of electron sources, such as bunch charge and average current. The proposed technique is based on the use of surface acoustical waves (SAW) generated on the piezoelectric surface of a GaAs photocathode. The generation of SAW on piezoelectric substrates is known to produce strong piezoelectric fields that propagate on the surface of the material. These fields can significantly suppress recombination effects and result in enhanced quantum efficiency of photoemission. Experimental measurements of photoemission quantum efficiency will be done on semiconductors used as photocathode materials (e.g., GaAs) in presence of SAW with varied parameters. The experimental results will be used as input for physics modeling that will provide a basis for design of operational SAW-enhanced photocathodes. While the improved quantum efficiency and parameter control expected from the use of SAW will be useful for many research devices and accelerators, the commercialization of such a widespread field as electron microscopy is compelling.

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WEPJE006

Dielectric Wakefield Accelerator Experiments at ATF

wakefield, experiment, electron, dipole

2681

D.Y. Shchegolkov, E.I. Simakov
LANL, Los Alamos, New Mexico, USA
S.P. Antipov
Euclid TechLabs, LLC, Solon, Ohio, USA
M.G. Fedurin
BNL, Upton, Long Island, New York, USA

Funding: This work is supported by the U.S. Department of Energy through the Laboratory Directed Research and Development (LDRD) program at Los Alamos National Laboratory.
Dielectric wakefield acceleration (DWA) presents us with means to achieve the accelerating gradient high above the limits of conventional accelerators. In a typical DWA scheme a higher energy lower charge main bunch is accelerated in the wakefield produced by a preceding lower energy higher charge drive bunch inside of a hollow metal-encapsulated dielectric tube. To make use of as much energy of the drive bunch as possible, it is highly important that all parts of it decelerate uniformly. Close to uniform drive bunch deceleration can be achieved if its current is properly shaped.* At Accelerator Test Facility (ATF) at BNL we shaped the current of a chirped electron beam with an adjustable mask placed inside of the highly dispersive region in the magnetic dogleg. We passed the shaped beam current through a quartz tube and observed the beam particles’ energy modulation at the tube’s output with a spectrometer. By tuning the mask we were able to control the beam energy modulation and thus the wakefield profile in the tube.
* B. Jiang, C. Jing, P. Schoessow, J. Power, and W. Gai, PRSTAB 15, 011301 (2012).

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WEPMA002

The Beam Chopper Power Converter for MedAustron: Safety by Design and Development

hardware, kicker, synchrotron, software

2741

T. Stadlbauer, R. Filippini, X. German, F. Osmić, P. Urschütz
EBG MedAustron, Wr. Neustadt, Austria
M.J. Barnes, T. Kramer
CERN, Geneva, Switzerland
M. Beerwald, D. Dirksen
Poynting GmbH, Dortmund, Germany

MedAustron is the Austrian centre for hadron therapy and non-clinical research. The beam chopper system is an essential component for patient safety in specific hazardous situations as well as for beam delivery from the synchrotron to the irradiation rooms. This paper presents the results from the development phase and the commissioning of the MedAustron beam chopper system. Details will be given on the design, the risk management, the test and the verification of the chopper power converter (PKC).

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WEPMA014

Development of New Microcontroller Based Power Supply Control Units at ELSA

interface, timing, power-supply, real-time

2777

D. Proft, W. Hillert, T. Perlitius
ELSA, Bonn, Germany

At the electron stretcher facility ELSA electrons are accelerated with a high ramping speed of 6 GeV/s. This leads to strong requirements on the main magnets power supplies. In particular, any synchronization errors directly result in beam tune shifts and, at worst, beam loss. The existing thirty years old control units are now being replaced by new in-house developed versatile microcontroller based ones. These allow the application of arbitrary ramp patterns and actual value acquisition in realtime. With an ethernet interface the ramp patterns can be uploaded directly to the power supplies. The flexible design also allows usage of the module to control other power supplies, e.g. those of the orbit correction magnets. This presentation will give details on the developed hardware design and the performance of the modules compared to the existing ones.

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WEPMA034

Bakeout Concept for the HESR at FAIR

dipole, vacuum, ion, heavy-ion

2832

H. Jagdfeld, N. Bongers, P. Chaumet, F.M. Esser, F. Jordan, F. Klehr, G. Langenberg, U. Pabst, L. Semke
FZJ, Jülich, Germany

Forschungszentrum Jülich has taken the leadership of a consortium being responsible for the design of the High-Energy Storage Ring (HESR) going to be part of the FAIR project at GSI. The HESR is designed for antiprotons but can be used for heavy ion experiments as well. Therefore the vacuum is expected to be 10^-11 mbar or better. To achieve this also in the curved sections where 44 bent dipole magnets with a length of around 4.5 m will be installed, NEG coated dipole chambers will be used to reach the needed pumping speed and capacity. For activation of the NEG-material a bakeout system must be installed. The bakeout concept including the layout of the control system and the systematization of the heater packages for all components of the vacuum system are presented. Also the special design of the heater jackets inside the dipole will be shown where the geometrical parameters are very critical and space is very limited. The results of the simulation of temperature distribution in the dipole iron are compared to temperature measurements carried out at a testbench with different layouts of the heater jackets. The final design of the dipole heater jackets will be illustrated.

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WEPMA041

1.3 GHz SRF Cryomodules for the Mainz Energy-recovering Superconducting Accelerator MESA

cryomodule, SRF, linac, lattice

2853

F. Schlander, K. Aulenbacher, R.G. Heine, D. Simon, T. Stengler
IKP, Mainz, Germany

Funding: Work supported by the German Federal Ministery of Education and Research (BMBF) and German Research Foundation (DFG) under the Cluster of Excellence "PRISMA"
The Mainz Energy-recovering Superconducting Accelerator MESA requires superconducting RF systems that provide sufficient energy of 50 MeV per turn to an electron beam. The ordering process of two Rossendorf-type cryomodules, containing two 9-cell 1.3 GHz XFEL-like cavities each, is in progress. Besides an overview of the adaptations required for the multipass and high current beam operation of the cryomodules, details about challenges regarding the installation of the cryomodules on the premises of the Institut für Kernphysik at Universität Mainz are given.

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WEPMA043

Five Years of Operations for the Magnet Power Supplies of FERMI

operation, FEL, linac, interface

2859

R. Visintini
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

FERMI, the FEL light source in Trieste, Italy, started its regular operation with external users in 2012. The construction of the facility began in 2008 and the commissioning of the complete system – LINAC, Undulators’ chains (FEL-1 and FEL-2), photon front-end – started in 2010. On December 13, 2010 the first lasing occurred. From the Photo-injector to the electron Main Beam Dump (MBD), there are more than 400 magnets and coils, including those mounted on the accelerating sections of the LINAC and on the Undulators. With few exceptions, each magnet power supply energizes a single magnet/coil: there are about 400 magnet power supplies spanning from few tens of watt up to 42 kW. The power supplies types range from custom-made ones, to COTS (Commercial Off The Shelf), to in-house design (these accounting to 88% of the total). Almost all magnet power supplies are in use since mid-2010. During 5 years of operations, the reliability of the magnet power supplies proved to be extremely high: the downtime of FERMI operations due to magnet power supplies is very low.

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WEPMA046

Studies on Innovative Production methods of HOM Coupler for SRF 9-cell Cavity

HOM, cavity, SRF, target

2869

K. Nohara, N. Kawabata, K. Miyajima, M. Shinohara
SPS, Funabashi-shi, Japan
H. Hayano, S. Kato, T. Saeki, A. Yamamoto, M. Yamanaka
KEK, Ibaraki, Japan

Pure Nb as the material of SRF cavity bears hard workability in general. This is why both the inner and outer conductors of HOM coupler for 9-cell cavity have been conventionally produced by full machining, backward extrusion accompanied with annealing and so on. However, in the mass production of 9-cell cavities in ILC, further cost reduction is required. We produced both the inner and outer conductors of HOM coupler for 9-cell cavity in the advanced press forming methods aiming at cost reduction. Press forming of a pure Nb sheet for the outer conductor of HOM coupler was performed with fewer processes free from intermediate annealing and primary machining. For the inner conductor of HOM coupler, water jet cutting and press cold-forging of a plate was performed. The above advanced press forming methods showed favored results, leading to a possibility of simple mass-production of components and cost reduction. The vertical test on a 9-cell cavity with the press formed HOM couplers achieved 36 MV/m that is beyond ILC qualification. The R＆D works are ongoing for further improvement.

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WEPMA052

Low Level RF Systems for J-PARC Linac 50-mA Operation

rfq, linac, cavity, operation

2889

Z. Fang, Y. Fukui, K. Futatsukawa, T. Kobayashi, S. Michizono
KEK, Ibaraki, Japan
E. Chishiro, F. Sato, S. Shinozaki
JAEA/J-PARC, Tokai-mura, Japan

In the summer of 2014, lots of improvements were carried out in the J-PARC proton linac, including the ion source, the Radio Frequency Quadrupole linac (RFQ), and the medium-energy beam-transport line from the RFQ to the Drift Tube Linac (DTL) called as MEBT1. The output beam current of the ion source was upgraded from 20 to 50 mA. The previous RFQ with two RF power input ports was replaced by a newly developed RFQ with one input port. The RF power of the solid state amplifier for the rf cavities used in the MEBT1 section were upgraded; from 10 to 30 kW for both of the Buncher-1 and Buncher-2, and from 30 to 120 kW for the Chopper cavity. The old scraper used as dump of chopped beam after the Chopper cavity was also replaced by a new dump system using two scrapers; A new function of separating the chopped beam automatically to the two scrapers was developed by modifying the FPAG control program in the low level control systems. After those improvements, in the September 2014 the J-PARC linac was successfully upgraded for 50-mA beam operation. The details of the improvments, especially for the low level RF systems, will be reported in this paper.

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WEPMA054

A Disturbance-Observer-based Controller for LLRF Systems

LLRF, beam-loading, cavity, experiment

2895

F. Qiu, D.A. Arakawa, Y. Honda, H. Katagiri, T. Matsumoto, S. Michizono, T. Miura, T. Obina
KEK, Ibaraki, Japan
S.B. Wibowo
Sokendai, Ibaraki, Japan

Digital low-level radio frequency (LLRFs) systems have been developed and evaluated in the compact energy recovery linac (cERL) at KEK. The required RF stabilities are 0.1% rms in amplitude and 0.1° rms in phase. These requirements are satisfied by applying digital LLRF systems. To further enhance the control system and make it robust to disturbances such as large power supply (PS) ripples and high-intensity beams, we have designed and developed a disturbance observer (DOB)-based control method. This method utilizes the RF system model, which can be acquired using modern system identification methods. Experiments show that the proposed DOB-based controller is more effective in the presence of high disturbances compared with the conventional proportional and integral (PI) controller. In this paper, we present the preliminary results based on the experiments with DOB-based controller.

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WEPMN004

Progress on the CSNS Power Supply System

power-supply, dipole, network, proton

2921

X. Qi, H. Geng
IHEP, Beijing, People's Republic of China

The 1.6 GeV proton synchrotron proposed in the CSNS Project is a 25 Hz rapid-cycling synchrotron (RCS) with injection energy of 80 MeV. Beam power is aimed to 100 kW at 1.6 GeV. The power supply system consists of seven subsystems. Those power supplies have three operation modes: DC mode, AC plus DC mode and programmable pulse mode. This paper will introduce the Power supply system status in recent years.
Power Supply, rapid-cycling synchrotron, serial resonant network

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WEPMN007

Research Development of High Precision Installation and Alignment System for HEPS

alignment, quadrupole, sextupole, multipole

2924

L. Wu, S.Y. Chen, C. H. Li, H. Qu, H.J. Wang, X.L. Wang
IHEP, Beijing, People's Republic of China

High Energy Photon Source (HEPS) is a proposed 6 GeV third generation light source with high brightness and ultra-low emittance. Because the measurement error of the traditional optical survey method in the girder and magnet installation can’t meet the tight alignment tolerance, the installation and alignment will not only rely on laser tracker and some other optical survey instruments. So HEPS is developing the research of high precision installation and alignment system which is consists of the design of auto-tuning girder based on beam alignment and research of vibrating wire alignment system based on magnetic measurement. This paper introduces the research development of installation and alignment system in storage ring of HEPS.

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WEPMN030

Testing Procedures for Fast Frequency Tuners of XFEL Cavities

cavity, LLRF, operation, cryomodule

2991

K.P. Przygoda, W. Cichalewski, T. Pożniak
TUL-DMCS, Łódź, Poland
J. Branlard, O. Hensler, H. Schlarb, Ch. Schmidt
DESY, Hamburg, Germany
K. Kasprzak
IFJ-PAN, Kraków, Poland

The XFEL accelerator will be equipped with 100 accelerating modules. Each accelerating module will host 8 superconducting cavities. Every single cavity will be equipped with a mechanical tuner. Coarse tuning will be supported by a step motor; fine tuning will be handled by double piezoelectric elements installed inside a single mechanical support, providing actuator and sensor functionality or redundancy. Before the main linac installation, all its subcomponents need to be tested and verified. The AMTF (Accelerator Module Test Facility) has been built at DESY to test all XFEL cryomodules. In total 1600 piezos need to be tested. Test procedures for fast frequency tuners have been developed to check their basic performance in cryogenic conditions (tuning range, polarity, acting and sensing abilities). High level applications perform fully automated tests including report generation. After the successful completion of the acceptance tests, the cryomodules will be prepared for tunnel installation.

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WEPMN032

Microphonic Disturbances Prediction and Compensation in Pulsed Superconducting Accelerators

cavity, linac, operation, flattop

2997

R. Rybaniec, L.J. Opalski
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
V. Ayvazyan, L. Butkowski, S. Pfeiffer, K.P. Przygoda, H. Schlarb, Ch. Schmidt
DESY, Hamburg, Germany

Accelerators are affected by the cavities detuning variation caused by external mechanical disturbances (microphonics). The paper presents microphonics estimation and prediction methods applicable for superconducting accelerators operating in pulsed mode. A mathematical model is built using the estimates of detuning during previous RF pulses. The model can be used for predictions of disturbances for the future time step and setup of the fast tuners accordingly. The proposed method was successfully verified with measurements conducted at the FLASH linac.

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WEPMN033

The Fabrication of Prototype Normal Conducting Rebuncher for the MEBT in RISP

cavity, resonance, linac, operation

3000

H.J. Kim, M.O. Hyun, B.-S. Park
IBS, Daejeon, Republic of Korea

The Medium Energy Beam Transport (MEBT) system of RAON consists of several quadrupole magnets for controlling the transverse beam parameter at the entrance of the low energy linac, three normal-conducting (NC) re-bunchers to match the longitudinal beam ellipse into the acceptance of the low energy linac and several diagnostic devices. The NC QWR re-buncher, which has a frequency of 81.25 MHz, a geometric beta factor of 0.032, and an effective length of 24 cm, has been fabricated and tested to demonstrate the frequency tuning by using slug tuner, power transmission and reflection with low input power, and pulsed high power transmission with cooling channels. In this presentation, we show the design and fabrication criteria for the high power, ~ 10 kW, re-buncher and its test results.

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WEPMN036

Design Study on a High Power RF Amplifier for the RFQ*

rfq, rf-amplifier, power-supply, operation

3009

M.-H. Chun, K.-H. Park, I.H. Yu
PAL, Pohang, Kyungbuk, Republic of Korea
J. Bahng
Kyungpook National University, Daegu, Republic of Korea
J.G. Hong, B.S. Lee, J.W. Ok, M. Won
Korea Basic Science Institute, Busan, Republic of Korea
D.S. Kim, Y. Moon, M. Seo
Dawonsys, Siheung-City, Republic of Korea
Y.S. Lee
SKKU, Suwon, Republic of Korea

Funding: Korea Basic Science Institute in Korea
The design of RF amplifier of 100 kW (CW) at 165MHz is studied for a Radio Frequency Quadruple (RFQ). The RFQ as a linear accelerator is used for acceleration of low energy beam to 500 keV/u at KBSI [1]. An RF amplifier is composed of a drive, an intermediate, and a final amplifier stage with power supplies. The intermediate amplifier (IPA) of 5 kW is designed with solid state amplifier modules, and the final amplifier is designed with a tetrode tube. The high voltage power supply for the tetrode provides the fine regulation of 15 kV at 10 A. The RF amplifier is operated by program logic controller (PLC) with interlocks, and a low level RF control for RFQ accelerator. This paper describes the present design study on the 100 kW RF amplifier.
"*" Supported by Korea Basic Science Institute in Korea

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WEPMN043

The RF Stability of PLS-II Storage Ring RF System

cavity, LLRF, EPICS, storage-ring

3024

I.H. Yu, M.-H. Chun, M.H. Jeong, Y.D. Joo, H.-S. Kang, H.-G. Kim, H.J. Park, I.S. Park, Y.U. Sohn
PAL, Pohang, Kyungbuk, Republic of Korea
Y.S. Lee
SKKU, Suwon, Republic of Korea

Funding: Minister of Science, ICT and Future Planing
The RF system for the Pohang Light Source (PLS) storage ring was greatly upgraded for PLS-II project of 400mA, 3.0GeV from 200mA, 2.5GeV. Three superconducting RF cavities with each 300kW maximum klystron amplifier were commissioned with electron beam in way of one by one during the last 3 years for beam current of 400mA to until March 2014. The RF system is designed to provide stable beam through precise RF phase and amplitude requirements to be less than 0.3% in amplitude and 0.3° in phase deviations. This paper describes the RF system configuration, design details and test results.

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WEPMN055

RAMI Optimization-Oriented Design For The LIPAc RF Power System

rf-amplifier, target, factory, diagnostics

3048

M. Weber, J.M. Arroyo, A. Ibarra, I. Kirpitchev, J. Mollá, P. Méndez, D. Regidor, C. de la Morena
CIEMAT, Madrid, Spain

Funding: This work has been funded by the Spanish Ministry of Economy and Competitiveness.
The Linear IFMIF Prototype Accelerator (LIPAc) is currently under construction in Rokkasho (Japan). LIPAc will generate a CW 9 MeV deuteron beam at 125 mA. It will serve to validate the final IFMIF accelerator concept and technologies. The RF power system is being integrated by CIEMAT (Spain) in collaboration with its partner companies and European institutes. LIPAc RF Power System design has been performed aiming high reliability, high availability and easy maintainability to address one of the most important requirements for IFMIF. The target of LIPAc tests is to validate the technologies and designs for the final phase of IFMIF. Several improvements in reliability, availability and maintainability have been implemented in the LIPAc RF power System. These improvements are based on both, new technologies and new maintenance philosophy. The results of their first tests are shown in this paper. Additional potential improvements are also analyzed.

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WEPMN061

ESS PLC Controls Strategy

PLC, timing, hardware, vacuum

3066

D.P. Piso, P. Arnold, S.L. Birch, T. Gahl, T. Korhonen, A. Nordt, J.G. Weisend
ESS, Lund, Sweden

The European Spallation Source ESS AB is an accelerator-driven neutron spallation source. The Integrated Controls System (ICS) division is responsible for providing controls and monitoring for all parts of the machine (accelerator, target, neutron scattering systems and conventional facilities). Also, Accelerator Division, Target Division and other parts of the organisation will be deploying PLC Automation Systems. A large number of applications have been identified across all the facility where PLCs will be used: cryogenics, vacuum, water-cooling, fluid systems, power systems, and safety \& protection systems. This work describes the different activities put in place and proposes the strategy followed at ESS regarding PLC technologies. This strategy consists not only of the standardisation of a PLC vendor but also testing activities, generation of documentation and standardization of other aspects (for instance, regarding installation). The documentation about PLC controls integration and standardisation and the approach to insert PLCs in the different controls workflows are described. Finally, the results of different tests (PLC timing correlation) are shown.

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WEPMN065

Progress at the FREIA Laboratory

cavity, linac, cryogenics, EPICS

3072

M. Olvegård, A.K. Bhattacharyya, T.J.C. Ekelöf, J. Eriksson, K. Fransson, K.J. Gajewski, V.A. Goryashko, L. Hermansson, M. Holz, M. Jacewicz, M. Jobs, Å. Jönsson, H. Li, T. Lofnes, H. Nicander, R.J.M.Y. Ruber, R. Santiago Kern, R. Wedberg, V.G. Ziemann
Uppsala University, Uppsala, Sweden
D.S. Dancila, A. Rydberg
Uppsala University, Department of Engineering Sciences, Uppsala, Sweden
R.A. Yogi
ESS, Lund, Sweden

The FREIA Facility for Research Instrumentation and Accelerator Development at Uppsala University, Sweden, has reached the stage where the testing of superconducting cavities for the European Spallation Source (ESS) is starting. The new helium liquefaction plant has been commissioned and now supplies a custom-made, versatile horizontal cryostat, HNOSS, with liquid helium at up to 140 l/h. The cryostat has been designed and built to house up to two accelerating cavities, or, later on, other superconducting equipment such as magnets or crab cavities. A prototype cavity for the spoke section of the ESS linac will arrive mid 2015 for high-power testing in the horizontal cryostat. Two tetrode-based commercial RF power stations will deliver 400 kW peak power each, at 352 MHz, to the cavity through an RF distribution line developed at FREIA. In addition, significant progress has been made with in-house development of solid state amplifier modules and power combiners for future use in particle accelerators. We report here on these and other ongoing activities at the FREIA laboratory.

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WEPMN067

Upgrade of the TCDQ Diluters for the LHC Beam Dump System

vacuum, PLC, survey, extraction

3079

M.G. Atanasov, W. Bartmann, J. Borburgh, C. Boucly, C. Bracco, L. Gentini, B. Moles, W.J.M. Weterings
CERN, Geneva, Switzerland

The TCDQ diluters are installed as part of the LHC beam dump system to protect the Q4 quadrupole and other downstream elements during a beam dump that is not synchronised with the abort gap, or in case of erratic firing of the extraction kickers. These diluter elements installed during Run 1 were compatible with beam up to 60 % of the nominal intensity, which was insufficient for the second run of the LHC. This paper describes the requirements for the upgrade done during the First Long Shutdown (LS1), to make the TCDQ compatible with the full 7 TeV LHC beam at intensities required for the future runs of the machine. Subsequently the mechanical design changes, implementation and commissioning of the TCDQ are reported.

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WEPMN071

Enhanced Diagnostic Systems for the Supervision of the Superconducting Circuits of the LHC

operation, diagnostics, dipole, hardware

3090

R. Denz, Z. Charifoulline, K. Dahlerup-Petersen, A.P. Siemko, J. Steckert
CERN, Geneva, Switzerland

Being an integral part of the protection system for the superconducting circuits of the LHC, the data acquisition systems used for the circuit supervision underwent a substantial upgrade during the first long shutdown of the LHC. The sampling rates and resolution of most of the acquired signals increased significantly. Newly added measurements channels like for the supervision of the quench heater circuits of the LHC main dipoles allow identifying specific fault states. All LHC main circuits are meanwhile equipped with earth voltage feelers allowing monitoring the electrical insulation strength, especially during the fast discharges. The protection system for the bus-bar splices is now capable to operate in different modes. By this measure, it is possible fulfilling the requirements for different specific tests like the warm bus-bar measurements and current stabilizer continuity measurements (CSCM) without field interventions.

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WEPHA004

Present Quality Assurance for the LHC Beam Vacuum System and its Future Improvement

vacuum, operation, cryogenics, status

3103

J. Sestak, V. Baglin, G. Bregliozzi, P. Chiggiato
CERN, Geneva, Switzerland

During the Long Shutdown 1 (LS1), the LHC beam vacuum system was upgraded to minimize dynamic vacuum effects like stimulated desorption and beam-induced electron multipacting. A quality assurance plan was mandatory due to the demanding vacuum performance and the limited access to the equipment during the following operation period. Laboratory assessment tests and underground interventions were performed following well-defined and approved procedures. All vacuum related activities were documented and written reports stored in dedicated databases. Quality controls were performed to find mechanical, cabling and equipment functionality non-conformities. Possible issues were identified, classified and tracked in a non-conformity database for future corrective actions. This contribution give an overview of the quality assurance policy followed during the LS1 and the non-conformities reported after quality control. Possible future improvements are also discussed.

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WEPHA006

Recommissioning of the COLDEX Experiment at CERN

electron, cryogenics, vacuum, experiment

3109

R. Salemme, V. Baglin, F. Bellorini, G. Bregliozzi, K. Brodzinski, P. Chiggiato, P. Costa Pinto, P. Gomes, A. Gutierrez, V. Inglese, B. Jenninger, R. Kersevan, E. Michel, M. Pezzetti, B. Rio, A. Sapountzis
CERN, Geneva, Switzerland

COLDEX (Cold bore Experiment), installed in the Super Proton Synchrotron (SPS) at CERN, is a test vacuum sector used in 2001-2004 to validate the Large Hadron Collider (LHC) cryogenic vacuum system with LHC type proton beams. Its cryostat houses a 2.2 m long copper perforated beam screen surrounded by a stainless steel cold bore, both individually temperature controlled down to 5 and 3 K, respectively. In the framework of the development for the High Luminosity upgrade of the LHC (HL-LHC), COLDEX has been re-commissioned in 2014. The objective of this re-commissioning is the validation of the performance of amorphous carbon coatings at cryogenic temperature with LHC type beams. The existing COLDEX beam screen has been dismounted and carbon coated, while a complete overhaul of the vacuum, cryogenic and control systems has been carried out. This contribution describes the phases of re-commissioning and reviews the current experimental set-up. An overview of the possible measurements with COLDEX, in view of its HL-LHC experimental program, is also presented.

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WEPHA017

Qualification of the Bypass Continuity of the Main Dipole Magnet Circuits of the LHC

dipole, operation, experiment, cryogenics

3141

S. Rowan, B. Auchmann, K. Brodzinski, Z. Charifoulline, B.I. Panev, F. Rodriguez-Mateos, I. Romera, R. Schmidt, A.P. Siemko, J. Steckert, H. Thiesen, A.P. Verweij, G.P. Willering
CERN, Geneva, Switzerland
H. Pfeffer
Fermilab, Batavia, Illinois, USA

The copper-stabilizer continuity measurement (CSCM) was devised in order to attain complete electrical qualification of all busbar joints, lyres, and the magnet bypass connections in the 13~kA circuits of the LHC. A CSCM is carried out at 20 K, i.e., just above the critical temperature, with resistive magnets. The circuit is then subject to an incremental series of controlled powering cycles, ultimately mimicking the decay from nominal current in the event of a magnet quench. A type test to prove the validity of such a procedure was carried out with success in April 2013, leading to the scheduling of a CSCM on all main dipole circuits up to and including 11.1 kA, i.e., the current equivalent of 6.5 TeV operation. This paper details the procedure, with respect to the type test, as well as the results and analyses of the LHC-wide qualification campaign.

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WEPHA028

Power Saving Status at NSSRC

synchrotron, operation, radiation, booster

3173

J.-C. Chang, W.S. Chan, Y.C. Chang, Y.F. Chiu, Y.-C. Chung, C.W. Hsu, K.C. Kuo, Y.-C. Lin, C.Y. Liu, Z.-D. Tsai, T.-S. Ueng
NSRRC, Hsinchu, Taiwan

National Synchrotron Radiation Research Center (NSRRC), Taiwan has completed the construction of the civil and utility system engineering of the Taiwan Photon Source (TPS) in 2014. The machine is in commission currently. The power consumption is much higher than ever. Currently, the contract power capacities of the Taiwan Light Source (TLS) and the TPS with the Taiwan Power Company (TPC) are 5.5 MW and 7.5 MW, respectively. The ultimate power consumption of the TPS is estimated about 12.5 MW. To cope with increasing power requirement in the near future, we have been conducting several power saving schemes, which include adjustment of supply air temperature according to the atmosphere enthalpy, replacement of old air conditioning unit (AHU), power consumption control by the operation of chillers, power factor improvement, and reduction of power consumption during long shutdown.

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WEPHA029

Operation of Both utility Systems of TPS and TLS at NSRRC

storage-ring, operation, instrumentation, distributed

3176

J.-C. Chang, W.S. Chan, Y.C. Chang, C.S. Chen, Y.F. Chiu, Y.-C. Chung, K.C. Kuo, Y.-C. Lin, C.Y. Liu, Y.-H. Liu, Z.-D. Tsai, T.-S. Ueng
NSRRC, Hsinchu, Taiwan

The construction of the utility system for the 3.0 GeV Taiwan Photon Source (TPS) was started in the end of 2009. The utility building for the TPS ring had been completed in the end of 2014. The final test and improvement had been completed in the end of 2014. The TPS is in commission and TLS is still in operation. Within limited manpower and budget, it is challenge to operate both utility systems stable and reliable. We provide good quality of electrical power, cooling water and precision air temperature. Power saving is also an important issue. The utility system presented in this paper includes the electrical power, cooling water, air conditioning, compressed air, and fire control systems.

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WEPHA032

Study on the LN2 Consumption of the Beamline Ln2 Transfer System for TPS Project*

cryogenics, operation, vacuum, superconducting-RF

3182

H.C. Li, W.S. Chan, S.-H. Chang, W.-S. Chiou, F. Z. Hsiao, W.R. Liao, T.F. Lin, H.H. Tsai
NSRRC, Hsinchu, Taiwan

One system to transfer liquid nitrogen (LN2) will be installed at TPS in 2015 for beamline. This system includes two transfer lines (length 600 m), eight keep-full devices and 26 branch lines with 26 control valves for 24 straight sections of beam lines. The required consumption of LN2 for each beam line is 30 L/h. An archive system was developed to monitor and to calculate the consumption of LN2 for each beam line. This consumption was calculated based on the pressure difference and the flow coefficient (Kv) of the control valve. This paper presents the configuration of the LN2 supply system at NSRRC and a test bench of the calculation of LN2 consumption. A simple test result is presented and discussed.
Cryogenics

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WEPHA033

Electrical Power SCADA System of Taiwan Photon Source

status, real-time, operation, GUI

3185

T.-S. Ueng, W.S. Chan, J.-C. Chang, Y.F. Chiu, K.C. Kuo, Y.-C. Lin
NSRRC, Hsinchu, Taiwan

The architecture of power SCADA system of TPS and its monitored real time data are described in this report. The on-line monitored and measured items include voltage/current, real power/reactive power, power factor, harmonic distortion, etc. These data are presented in trend charts. The electric energy, the power quality and the harmonic distortion obtained with the SCADA system are used to study the status of the power system, and also provide information for the future improvement.

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WEPHA034

Commissioning of the De-ionized Water System for Taiwan Photon Source

booster, photon, target, storage-ring

3188

W.S. Chan, J.-C. Chang, Y.C. Chang, C.S. Chen, Y.-C. Chung, C.W. Hsu, C.Y. Liu, Z.-D. Tsai
NSRRC, Hsinchu, Taiwan

The de-ionized water (DIW) system plays a critical role in removing waste heat from an accelerator machine. Through years of design and constructs, the DIW system for Taiwan Photon Source (TPS) was complete at the end of 2013, but it is important to confirm that the quantity and quality of DIW comply with the requirements of the accelerator machine. Testing, adjustment and balancing methods have been applied to verify that the DIW system for TPS can provide flow rates greater than 1659, 380, 1284 and 1238 GPM in the individual Cu, Al, RF and booster subsystems. The proposed system can supply DIW of quality such that the resistivity is greater than 10 MΩ-cm at 25±0.1 oC; the concentration of dissolved oxygen (DO) is less than 10 ppb.

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WEPHA038

Upgrading the Performance of the Power Supply for the TPS Booster Dipole Magnets

power-supply, booster, dipole, injection

3197

C.Y. Liu, Y.-C. Chien, K.-B. Liu, B.S. Wang, Y.S. Wong
NSRRC, Hsinchu, Taiwan

The performance of the power supply for the dipole magnet is important for the TPS booster ring. The output current of the power supply follows the beam current from 150 MeV ramping to 3 GeV. The frequency of the power supply is 3 Hz. The power supply must thus push enormous energy into the dipole magnets at +1000 V and +1000 A, and can handle this job. Because the TPS booster dipole supply is bipolar and the voltage is large, the lodged capacitors have large effects that produce common-mode high-frequency current noise, which drives the power supply beyond specification. The TPS booster ring hence fails to meet the dc and ramping specification. We designed a common-mode filter to solve the high-frequency current noise by absorbing the current noise from the path of the lodged capacitors to the ground pad. The TPS booster dipole supply thus works within the specification when the power supply is in the dc or ramping mode. The beam current from the 150- MeV dc mode for the injection mode can ramp the beam current to 3 GeV. This paper reports the excellent results.

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WEPHA039

Inrush Current Suppression Scheme of Hot Swap Power Modules

power-supply, simulation, synchrotron, photon

3200

Y.T. Li, C.Y. Liu, K.-B. Liu
NSRRC, Hsinchu, Taiwan

The corrected magnet power supplies apply modular designed for Taiwan Photon Source synchrotron project (TPS). If the module is damaged in the chassis, it must to be replaced without interrupting the power. However, the modular is a shared DC bus. If there is no good design and planning, it will cause the protection circuit into action. In this article the theoretical derivation and implementation are used to prove the feasibility and necessity of the soft-start circuit. In the actual signal measurements it could be clearly seen the inrush currents is refrained and improved. Finally, the soft-start circuit is implemented applications in correction magnet power supply modular of Taiwan Photon Source synchrotron project (TPS).

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WEPHA040

Status of AC Power Supplies for TPS Booster Ring

booster, dipole, power-supply, lattice

3203

Y.-C. Chien, P.C. Chiu, K.T. Hsu, C.Y. Liu, K.-B. Liu, B.S. Wang, Y.S. Wong, C.Y. Wu
NSRRC, Hsinchu, Taiwan

TPS is a third generation 3 GeV synchrotron light source under commission in Taiwan. The TPS Booster ring is concentric ring design sharing the same tunnel with storage ring. The booster ring power supplies are responsible of accelerating the 150 MeV Linac output energy to 3 GeV before the beam is preserved in the storage ring. The booster ring power supplies are required to operate at 3Hz sinusoidal waveform with 1000 A peak current for the dipole magnet. All power supplies' specifications and output performance are demonstrated here in this paper.

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WEPHA041

ALGORITHM AND CIRCUIT TO IMPROVE ZERO-CROSSING STABILITY OF BIPOLAR TPS TRIM COIL POWER SUPPLY

simulation, feedback, FPGA, interface

3206

B.S. Wang, Y.-C. Chien, P.C. Chiu, K.T. Hsu, C.Y. Liu, K.-B. Liu, Y.S. Wong, C.Y. Wu
NSRRC, Hsinchu, Taiwan

In TPS (Taiwan Photon Source) project, 58 home-built small form factor bipolar power supplies are used to fine-tune the trim coil of booster ring bending dipole magnets. With the preliminary analog PI control loop design version, current output will tend to behave with poor linearity around zero current. By employing DSP chip, a full digital PI control loop design together with optimal MOSFT switching algorithm and 13bits PWM output capability is capable of improving the output current performance around zero current. Before the final realization, MATLAB SIMULINK is utilized to find out the optimal MOSFT switching algorithm, and then physical circuit is implemented and tested. The result and design will be demonstrated in this paper to show significant improvement around zero current.

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WEPHA042

Commissioning of the TPS Cooling System: Testing, Adjusting, Balancing and Numerical Simulation

simulation, storage-ring, monitoring, status

3209

Z.-D. Tsai, W.S. Chan, Y.C. Chang, C.S. Chen, Y.-C. Chung, C.W. Hsu, C.Y. Liu
NSRRC, Hsinchu, Taiwan

The civil construction and utility systems of the 3-GeV Taiwan Photon Source (TPS) at NSRRC are ready for machine commissioning in 2014. To achieve a highly precise control of temperature, the thermal load must be carefully controlled and balanced. On analysis of the characteristics between the water pipes and the balance valves, a specified control philosophy can effectively adjust the pressure load on the branch pipes to balance the water flow. With regard to the air flow, we use a damper, baffle plant or variable air-volume (VAV) box to balance the air flow of each diffuser. Here we discuss the mechanism through a numerical simulation of the hydrodynamics and verify the practical influences of the testing, adjusting and balancing (TAB) for de-ionized water and the heating, ventilation and air-conditioning (HVAC) system.

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WEPHA045

Design and Construction of the RF Electronic System at Taiwan Photon Source

cavity, booster, LLRF, detector

3215

F.-T. Chung, L.-H. Chang, M.H. Chang, L.J. Chen, PY. Chen, M.-C. Lin, Z.K. Liu, C.H. Lo, C.L. Tsai, M.H. Tsai, Ch. Wang, M.-S. Yeh, T.-C. Yu
NSRRC, Hsinchu, Taiwan

The RF electronic system at NSRRC was made fully in house by the RF group from design through construction to completion. The first RF electronic system includes an analogue LLRF system, a step motor, and an ARC module of a Petra cavity. It was successfully integrated with a 100-kW RF transmitter, high-power RF transfer system, and a cooling system and applied to the booster of TPS. Two duplicated RF electronic system were then applied to the storage ring but integrated with the 300-KW transmitters. With these RF systems, the TPS storage ring achieved beam current 100 mA on 2015 March 26.

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WEPTY004

Mathematical Modeling and Analysis of a Wide Bandwidth Bipolar Power Supply for the Fast Correctors in the APS Upgrade Controller

power-supply, simulation, feedback, operation

3264

B. Song, J. Wang
ANL, Argonne, Ilinois, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
The APS Upgrade requires a fast bipolar power supply for the fast correction magnets. The performance requirement of the power supply includes a -3dB at 10 kHz small-signal bandwidth for the output current. This requirement presents a technical challenge to the design of the power circuit and the power supply regulator because the magnet load may have a significant inductance and make it difficult to achieve a high bandwidth for the current. In order to meet the requirement, different circuit topologies and regulators are being investigated. One of the candidate designs combines a standard H-bridge pulse-width modulation (PWM) circuit and a linear power amplifier to provide a ±15A DC current and an AC component up to 1% of the full scale with the required bandwidth. An appropriate feedback control loop and a current regulator are being designed. The mathematical modeling and simulation of the power circuit and the control loop are being conducted to prove the concept of the design. This paper presents the design of the circuit, mathematical modeling, and the simulation results.

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WEPTY010

Electropolishing for Low-Beta and Quasi-Waveguide SRF Cavities

cavity, cathode, SRF, niobium

3273

T. Reid, Z.A. Conway, S.M. Gerbick, M. Kedzie, M.P. Kelly, P.N. Ostroumov
ANL, Argonne, Illinois, USA

Argonne National Laboratory (ANL) has extended high quality electropolishing techniques based on those developed for the International Linear Collider to several more complex superconducting RF cavities. These include the co-axial TEM-mode quarter-wave and half-wave cavities as well as a 2.8 GHz quasi-waveguide structure intended for beam bunch rotation. This system is an improved version of the one developed for 1.3 GHz 9-cell cavities and includes easy provision for direct water cooling using the helium jacket. The performance of these SRF cavities both in terms of RF fields and losses equals or exceeds that of most 9-cell elliptical cavities built and tested today.

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WEPTY011

Power Supply Conceptual Design and R&D for the APS Upgrade

power-supply, interface, FPGA, network

3276

J. Wang, B. Deriy, T. Fors, R.T. Keane, B. Song
ANL, Argonne, Illinois, USA

Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
The MBA upgrade for the APS requires a large number of power supplies with either unipolar or bipolar DC output currents. The unipolar power supplies will be used to power the main coils in the dipole, quadrupole, and sextupole magnets and the bipolar power supplies will be used for the trim or correction coils. There are several demanding requirements of the power supplies. The unipolar power supplies are expected to have a current stability within 10 parts per million (ppm) of the full scale. The currents must be calibrated to the specification and confirmed with independent and accurate measurement. The bipolar power supplies for the fast correction magnets are required to have a wide output current bandwidth in order to minimize the impact on the real-time feedback system for the beam position correction. There are also new requirements for the power supply controls and communications that are much more demanding than that in the existing APS accelerators. This paper will report the conceptual designs of the power supply systems and the R&D program that is developed to find solutions to the technical challenges.

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WEPTY017

Development of 650 MHz β=0.9 5-cell Elliptical Cavities for PIP-II

cavity, resonance, proton, linac

3296

M.H. Awida, M.H. Foley, I.V. Gonin, C.J. Grimm, T.N. Khabiboulline, A. Lunin, V.P. Yakovlev
Fermilab, Batavia, Illinois, USA

5-cell 650 MHz elliptical cavities are being developed for the Proton Improvement Plan II (PIP-II) of Fermilab. The cavities are designed to accelerate protons of relative group velocity β=0.9 at the high energy part of the linear particle accelerator. In this paper, we report the status of these cavities and summarize the results of the quality control measurements performed on four initial prototypes.

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WEPTY027

Kicker Pulsers for Recycler Nova Upgrades

cathode, kicker, impedance, high-voltage

3324

C.C. Jensen
Fermilab, Batavia, Illinois, USA

Funding: Fermilab is operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
An upgrade of the Recycler injection kicker system required a faster rise time pulser. This system required a field rise and fall time of < 57 ns and a field flattop of 1.6 μs. This paper describes the variety of improvements made over the years that have resulted in this latest thyratron pulser. The effects of the trigger, the reservoir and the load impedance on delay and rise time will be discussed.

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WEPTY036

Progress at FNAL in the Field of the Active Resonance Control for Narrow Bandwidth SRF Cavities.

cavity, resonance, feedback, operation

3355

W. Schappert, J.P. Holzbauer, Y.M. Pischalnikov
Fermilab, Batavia, Illinois, USA

Funding: Fermi Research Alliance, LLC under Contract N. DE-AC02-07CH11359 with U.S. Department of Energy.
Recent efforts at FNAL to actively compensate microphonics in narrow bandwidth cavities are discussed. Feed-forward compensation of Lorentz force detuning in combination with feedback of the forward/probe phase difference to a piezo actuator successfully stabilized the resonance of a 325 MHz spoke resonator to within 11 mHz of the frequency of the open-loop CW RF drive over a two hour interval.

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WEPTY041

DESIGN CONCEPT AND PARAMETERS OF A 15 T Nb3Sn DIPOLE DEMONSTRATOR FOR A 100 TEV HADRON COLLIDER

dipole, collider, hadron, magnet-design

3365

A.V. Zlobin, N. Andreev, E.Z. Barzi, V.V. Kashikhin, I. Novitski
Fermilab, Batavia, Illinois, USA

Funding: *Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy
Hadron Colliders (HC) are the most powerful discovery tools in modern high energy physics. A 100 TeV HC in a ~100 km tunnel with a nominal operation field of ~15 T is being considered for the post-LHC era. The choice of a 15 T nominal field requires using the Nb3Sn technology. Practical demonstration of this field level in an accelerator-quality magnet and substantial reduction of magnet costs are key conditions for the realization of such a machine. FNAL has started the development of a 15 T Nb3Sn dipole demonstrator for a 100 TeV HC. As a first step in this direction, the existing 11 T dipole magnet, developed for LHC upgrades, will be modified by adding two layers to achieve the nominal field of 15 T in a 60 mm aperture. As the next step, to increase the field margin the innermost 2-layer coil will be replaced with an optimized coil using the conductor grading approach. This paper describes the design concept and parameters of the 15 T Nb3Sn dipole demonstrators. Magnetic, mechanical and quench protection issues are discussed.

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WEPTY043

Short Pulse Marx Modulator

high-voltage, flattop, network, collider

3370

R.A. Phillips, M.P.J. Gaudreau, M.K. Kempkes, B.E. Simpson
Diversified Technologies, Inc., Bedford, Massachusetts, USA
J.A. Casey
Rockfield Research Inc., Las Vegas, Nevada, USA

Funding: DE-SC0004251
High energy, short-pulse modulators are being re-examined for the Compact Linear Collider (CLIC) and numerous X-Band accelerator designs. At the very high voltages required for these systems, all of the existing designs are based on pulse transformers, which significantly limit their performance and efficiency. There is not a fully optimized, transformer-less modulator design capable of meeting the demanding requirements of very high voltage pulses at short pulse widths. Under a U.S. Department of Energy grant, Diversified Technologies, Inc. (DTI) has completed development of a short pulse, solid-state Marx modulator. The modulator is designed for high efficiency in the 100 kV to 500 kV range, for currents up to 250 A, pulse lengths of 0.2 to 5.0 μs, and risetimes <300 ns. Key objectives of the development effort were modularity and scalability, combined with low cost and ease of manufacture. For short-pulse modulators, this Marx topology provides a means to achieve fast risetimes and flattop control that are not available with hard switch or transformer-coupled topologies.

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WEPTY054

Grid Window Tests on an 805-MHz Pillbox Cavity

Windows, cavity, scattering, radiation

3393

Y. Torun
Illinois Institute of Technology, Chicago, Illlinois, USA
A. Moretti
Fermilab, Batavia, Illinois, USA

Funding: Supported by the US Department of Energy Office of Science through the Muon Accelerator Program.
Muon ionization cooling channel designs use pillbox shaped RF cavities for improved power efficiency and fine control over phasing of individual cavities. For minimum scattering of the muon beam, the ends should be made out of a small thickness of high radiation length material. Good electrical and thermal conductivity are required to reduce power dissipation and remove the heat efficiently. Thin curved beryllium windows with TiN coating have been used successfully in the past. We have built an alternative window set consisting of grids of tubes and tested these on a pillbox cavity previously used with both thin Be and thick Cu windows. The cavity was operated with a pair of grids as well as a single grid against a flat endplate.

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WEPTY058

Diagnostics for High Power CW Accelerators

diagnostics, operation, lattice, software

3405

S. Assadi
Texas A&M University, College Station, Texas, USA

Funding: Work is partially supported by grants from the State of Texas (ASE) & the Michelle foundation
High power, continuous wave (cw) accelerators are proposed for applications such as Accelerator Driven Systems (ADS) for subcritical reactor strategies and heavy ion accelerators for the production of rare isotopes. Because of the high beam powers and high energy loss with beam interception of material, the beam diagnostic designs are necessarily shifting to non-intercepting, real-time feedback devices that can be fully integrated with the accelerator machine protection system (MPS) and operation control system including online models. Appropriate for these applications, three types of beam diagnostics (lanthanum bromide scintillation coincidence detectors, GaN neutron and gamma detectors, and beam position monitors) are presented.

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WEPTY074

Recent Studies on the Current Limitations of State-of-the-Art Nb3Sn Cavities

cavity, niobium, cryomodule, accelerating-gradient

3454

D.L. Hall, M. Liepe, J.T. Maniscalco, S. Posen
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
Th. Proslier
ANL, Argonne, Illinois, USA

Funding: NSF PHY-1305500 PHY-14116318 DOE ER41802
Recent advances in the study of Nb3Sn at Cornell University have yielded single-cell cavities that show excellent performance without the limiting Q-slope seen in previous work. This performance has been shown to be repeatable across multiple cavities. However, they are still limited by a quench field of approximately 16 MV/m, as well as residual resistance. In this work we present results quantifying the impact of ambient magnetic fields on Nb3Sn cavities, as well as discuss the impact of cavity cooldown procedures on cavity performance. Finally, we will briefly discuss XRD results that shed light on the composition of the Nb3Sn layer and how this relates to the current limits of these cavities.

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WEPTY075

Hc2 Measurements of Nb3Sn and Nitrogen-doped Niobium using Physical Property Measurement System

niobium, SRF, superconductivity, radio-frequency

3458

J.T. Maniscalco, D. Gonnella, D.L. Hall, M. Liepe, S. Posen
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

The measurement of the upper critical field of a type-2 superconductor, Hc2, is an important step in determining its superconducting properties, and therefore its suitability as a material in SRF cavities. However, measuring Hc2 directly can be challenging, as performing electrical measurements causes changes in the very properties one seeks to measure. We present a method for extracting Hc2 from resistivity measurements made near the transition temperature for varied applied fields and excitation currents. We also present results of these measurements made on Nb3Sn and nitrogen-doped niobium.

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WEPTY084

Cooling Systems for the New 201.25 MHz Final Power Amplifiers at Los Alamos Neutron Science Center (LANSCE)

DTL, hardware, neutron, cavity

3479

W.C. Barkley, C.E. Buechler, J.T.M. Lyles, A.C. Naranjo
LANL, Los Alamos, New Mexico, USA
D. Baca, R.E. Bratton
Compa Industries, Inc., Los Alamos, New Mexico, USA

Funding: Los Alamos National Laboratory, an affirmative action/equal opportunity employer, is operated by the University of California for the U.S. Department of Energy under contract W-7405-ENG-36.
Two new 201.25 MHz RF Final Power Amplifiers (FPAs) have been designed, fabricated, assembled, installed and successfully tested at the Los Alamos Neutron Science Center (LANSCE), in Module 2 of the Drift Tube Linac. These production units were fabricated at Continental Electronics Corporation. In this paper, we summarize the FPAs air and water cooling requirements and cooling systems.

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WEPWI002

Installation and Operation of Replacement 201 MHz High Power RF System at LANSCE

DTL, linac, cavity, electronics

3485

J.T.M. Lyles, W.C. Barkley, J. Davis, D. Rees, G. M. Sandoval, Jr.
LANL, Los Alamos, New Mexico, USA
R.E. Bratton, R.D. Summers
Compa Industries, Inc., Los Alamos, New Mexico, USA

Funding: Work supported by the United States Department of Energy, National Nuclear Security Agency, under contract DE--AC52--06NA25396.
The LANSCE RM project has restored the linac to high power capability after the power tube manufacturer could no longer provide triodes that consistently met our high average power requirement. Diacrodes® now supply RF power to two of the four DTL tanks. These tetrodes reuse the existing infrastructure including water-cooling systems, coaxial transmission lines, high voltage power supplies and capacitor banks. The power amplifier system uses a combined pair of LANL-designed cavity amplifiers using the TH628L Diacrode® to produce up to 3.5 MW peak and 420 kW of mean power. Design and prototype testing was completed in 2012, with commercialization following in 2013. The first installation was completed in 2014 and a second installed system is ready to test. The remaining replacement will follow in 2016. Meanwhile, there is a hybrid of old/new amplifiers until the changeover is complete. Operating results of the replacement system are summarized, along with observations from the rapid--paced installation project.

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WEPWI005

Novel Approach to Variable Voltage Substation Protection

operation, monitoring, simulation, pick-up

3496

M.Y. Mehtabuddin, C. Jach, S. Olek
SLAC, Menlo Park, California, USA

Conventional electrical system protection of variable voltage substations(medium voltage rated) of using fuses and phase overcurrent and/or phase time overcurrent protection is not adequate. This was evident from the recent variable voltage substation (VVS) electrical fire at SLAC. Using information obtained from the fire investigation, ETAP simulations, and event reports of the faults which led to the fire, SLAC put into action a fast, feasible, and economical relay protection plan into adequately protecting VVS until long term plan of replacements is implemented. The plan utilizes the existing microprocessor protection relays on the upstream vacuum breakers and included the following adjustments: Adjusting the long time overcurrent according to the de-rated cable ampacities, dual-fed arc flash fault protection, adding negative sequence settings and relay control logic to allow for two sets of settings for inrush mode and normal mode.

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WEPWI028

Simulation Study Using an Injection Phase-locked Magnetron as an Alternative Source for SRF Accelerators

injection, klystron, cavity, SRF

3544

H. Wang, T. E. Plawski, R.A. Rimmer
JLab, Newport News, Virginia, USA

As a drop-in replacement for the CEBAF CW klystron system, a 1497 MHz, CW type high efficiency magnetron using injection phase lock and amplitude variation is attractive. Amplitude control using magnetic field trimming and anode voltage modulation has been studied using analytical models and MATLAB/Simulink simulations. Since the 1497 MHz magnetron has not been built yet, previously measured characteristics of a 2.45GHz cooker magnetron are used as reference. The results of linear responses to the amplitude and phase control of a superconducting RF (SRF) cavity, and the expected overall benefit for the current CEBAF and future MEIC RF systems are presented in this paper.

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WEPWI044

High-Power Magnetron Transmitter for the Electron Collider Ring of the MEIC Facility

SRF, cavity, electron, injection

3587

G.M. Kazakevich
Euclid TechLabs, LLC, Solon, Ohio, USA
B.E. Chase, V.P. Yakovlev
Fermilab, Batavia, Illinois, USA
Y.S. Derbenev
JLab, Newport News, Virginia, USA

Operation of the 3-12 GeV electron collider 8-shape ring of the MEIC facility causes a Synchrotron Radiation (SR) of electrons in arcs with energy loss of ~20 kW/m at beam current of ~3 A. The total SR loss up to 2 MW per a revolution is presumed to compensate by Superconducting RF (SRF) accelerating cavities. To minimize the beam emittance, each individual SRF cavity is proposed to feed by an individual and independent RF source allowing a wide-band control in phase and power. Most efficient and less expensive in capital and maintenance costs the high-power transmitters based on magnetrons, injection-locked by phase-modulated signals, controlled in wide-band are proposed as the RF sources. The magnetron RF sources utilizing 2-cascade magnetrons allowing a wide-band phase and power control by the injection-locking phase-modulated signals were experimentally modelled by 2.45 GHz, CW, 1 kW magnetrons. Results of the modelling and adequacy of the transmitters for the SRF cavities are discussed in the presented article.

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WEPWI056

A Number of Upgrades on RHIC Power Supply System

power-supply, operation, collider, superconducting-magnet

3618

C. Mi, D. Bruno, A. Di Lieto, J. Drozd, G. Heppner, T. Nolan, F. Orsatti, T. Samms, J. Sandberg, C. Schultheiss, R. Zapasek
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
This year marks the 15th run for the Relativistic Heavy Ion Collider (RHIC). Operation of a reliable superconducting magnet power supply system is a key factor of accelerator’s performance. Over the past 15 of years, the RHIC power supply system has been made many improvements to increase the machine availability and reduce failures. During these past 15 years of operating RHIC a lot of problems have been solved or addressed. In this paper some of the essential upgrades/improvements are discussed.

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WEPWI057

A New Bipolar qtrim Power Supply System

power-supply, operation, interface, quadrupole

3621

C. Mi, D. Bruno, A. Di Lieto, J. Drozd, G. Heppner, T. Nolan, F. Orsatti, T. Samms, J. Sandberg, C. Schultheiss, R. Zapasek
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
This year marks the 15th run of RHIC (Relativistic Heavy Ion Collider) operations. The reliability of superconducting magnet power supplies is one of the essential factors in the entire accelerator complex. Besides maintaining existing power supplies and their associated equipment, newly designed systems are also required based on the physicist’s latest requirements. A bipolar power supply was required for this year’s main quadrupole trim power supply. This paper will explain the design, prototype, testing, installation and operation of this recently installed power supply system.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWI057

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WEPWI058

The NSLS-II RF Cryogenic System

cavity, cryogenics, PLC, operation

3624

J. Rose, T. Dilgen, W.K. Gash, J. Gosman, J. Papu, R. Sikora
BNL, Upton, Long Island, New York, USA
Y. Jia
Linde BOC Process Plants LLC, Tulsa, Oklahoma, USA
C.M. Monroe
Monroe Brothers Ltd., Moreton-in-Marsh, United Kingdom
V. Ravindranath
SLAC, Menlo Park, California, USA
H. Wilhelm
Linde Kryotechnik AG, Pfungen, Switzerland

Funding: Work supported by DOE contract DE-SC0012704
The National Synchrotron Light Source II is a 3 GeV X-ray user facility commissioned in 2014. A new helium refrigerator system has been installed and commissioned to support the superconducting RF cavities in the storage ring. Special care was taken to provide very stable helium and LN2 pressures and flow rates to minimize microphonics and thermal effects at the cavities. Details of the system design along with commissioning and early operations data will be presented.

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THXB1

CEBAF SRF Performance during Initial 12 GeV Commissioning

cryomodule, cavity, klystron, operation

3638

R. Bachimanchi, T.L. Allison, E. Daly, M.A. Drury, C. Hovater, G.E. Lahti, C.I. Mounts, R.M. Nelson, T. E. Plawski
JLab, Newport News, Virginia, USA

The Continuous Electron Beam Accelerator Facility (CEBAF) energy upgrade from 6 GeV to 12 GeV includes the installation of eleven new 100 MV cryomodules (88 cavities). The superconducting RF cavities are designed to operate CW at an accelerating gradient of 19.3 MV/m with a QL of 3×107. Not all the cavities were operated at the minimum gradient of 19.3 MV/m with the beam. Though the initial 12 GeV milestones were achieved during the initial commissioning of CEBAF, there are still some issues to be addressed for long term reliable operation of these modules. This paper reports the operational experiences during the initial commissioning and the path forward to improve the performance of C100 (100 MV) modules.

Slides THXB1 [5.595 MB]

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THYB2

The Auto-Alignment Girder System of TPS Storage Ring

alignment, storage-ring, survey, laser

3649

T.C. Tseng, J.-R. Chen, M.L. Chen, P.S.D. Chuang, H.C. Ho, K.H. Hsu, D.-G. Huang, C.K. Kuan, W.Y. Lai, C.-S. Lin, C.J. Lin, S.Y. Perng, C.W. Tsai, H.S. Wang
NSRRC, Hsinchu, Taiwan

To meet the stringent beam dynamic specs of TPS with high brilliance and low emittance characteristics, also to align the girders precisely and quickly with less manpower, the girder system for TPS (Taiwan Photon Source) storage ring is of an auto-tuning design. Each girder can be fine adjusted in 6 axes with 6 motorized cam movers of kinematic mounting design on 3 pedestals. With sensors between each girder, there are 72 girders to make up a whole ring auto-alignment girder system. All the sub-systems were carefully assembled and calibrated in a rented factory outside NSRRC during the civil construction period. Mock-up systems were set up and the auto–alignment processes were examined to modify interferences or mistakes between sub-systems. After the TPS building was nearly completed, the laser tracker alignment network was set up first and then the installation took place. When all the girders and sensors were installed into the tunnel, the auto-alignment procedures were carried out to fine tune all the girders. This paper describes the design, preparation, installation and implementation of this auto-alignment girder system for TPS storage ring.

Slides THYB2 [9.476 MB]

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THPF051

Beam-based Alignment Simulation on Transport Line of CSNS

quadrupole, alignment, simulation, proton

3818

Y. Li, Y.W. An, L. Huang, W.B. Liu, S. Wang
IHEP, Beijing, People's Republic of China

The China Spallation Neutron Source (CSNS) is a high beam power proton machine which needs high precise alignment. Compared to traditional optical alignment, the beam-based alignment (BBA) technique can implement higher precise alignment. This technique with two implementations is applied to the transport line of CSNS to get the transverse misalignments of beam position monitor (BPM) and quadrupole magnet by measuring BPM data under different conditions. The corresponding control system application programs were developed based on CSNS/XAL platform. The result shows the fitted result is consistent with the input result.

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THPF054

XAL Development for CSNS/RCS Commissioning

quadrupole, framework, simulation, dipole

3821

Y.W. An, L. Huang, W.B. Liu, Y.D. Liu, S. Wang, Y. Wei
IHEP, Beijing, People's Republic of China

Funding: Work supported by the National Natural Science Fund Committee, contract 11405189.
As a key component of the China Spallation Neutron Source (CSNS) Project, the Rapid Cycling Synchrotron (RCS) accumulates and accelerates the proton beam from 80MeV to 1.6GeV for extracting and striking the target with a repetition rate of 25Hz. A high level application programming framework code called XAL, based on Java Language with a well-performance online model, initially developed at the Spallation Neutron Source (SNS), has been installed as a part of control system via connection to EPICS for CSNS. Much of the applications have been initially established such as Tune Scan, Tune Monitor, Orbit Response Matrix Measurement, RCS Orbit Display, and Beta Function Measurement for preparing CSNS/RCS commissioning are showed in this paper.

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THPF059

RHIC Electron Lenses Upgrades

electron, proton, cathode, ion

3830

X. Gu, Z. Altinbas, S. Binello, D. Bruno, M.R. Costanzo, K.A. Drees, W. Fischer, D.M. Gassner, M. Harvey, J. Hock, K. Hock, Y. Luo, A. Marusic, K. Mernick, C. Mi, R.J. Michnoff, T.A. Miller, M.G. Minty, A.I. Pikin, G. Robert-Demolaize, T. Samms, V. Schoefer, T.C. Shrey, Y. Tan, R. Than, P. Thieberger
BNL, Upton, Long Island, New York, USA
S.M. White
ESRF, Grenoble, France

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
In the Relativistic Heavy Ion Collider (RHIC) 100 GeV polarized proton run in 2015[1], two electron lenses [2] were used for the first time to partially compensate for the head-on beam-beam effect. Here, we describe the design of the current electron lens, detailing the hardware modifications made after the 2014 commissioning run with heavy ions. A new electron gun with 15-mm diameter cathode is characterized. The electron beam transverse profile was measured using a YAG screen and fitted with a Gaussian distribution. During operation, the overlap of the electron and proton beams was achieved using the electron backscattering detector in conjunction with an automated orbit control program.

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THPF076

Thermal and Structural Analysis of the 72.75 MHz LINCE RFQ

rfq, cavity, simulation, software

3857

A.K. Orduz, A. Berjillos, C. Bonțoiu, J.A. Dueñas, I. Martel
University of Huelva, Huelva, Spain
A. Garbayo
AVS, Elgoibar, Spain

Funding: Work partially supported by the Spanish Government (MINECO-CDTI) under program FEDER INTERCONNECTA.
The 72.75 MHz LINCE RFQ is designed to function at room temperature. Effective operation of the RFQ cavity requires efficient water cooling in order to dissipate significant resistive power non-uniformly distributed on the copper walls and vanes. This amounts to about 10 kWfor one 0.5m long RFQ section. Cylindrical cooling channels have been designed and optimized by varying their diameter and position in order to minimize the frequency shift generated by thermal displacements. The article reports results of power loss simulations coupled with electromagnetic modelling studies and their consequences on the RFQ performance in terms of resonant frequency and thermal deformations.

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THPF079

A Planning and Scheduling System for the ESS Accelerator Project

neutron, linac, project-management, cryomodule

3867

L. Lari, M.J. Conlon, H. Danared, L. Gunnarsson, G. Jacobsson, M. Jakobsson, M. Lindroos, E. Tanke, J.G. Weisend
ESS, Lund, Sweden
P. Bonnal, L. Lari
CERN, Geneva, Switzerland

Constructing a large, international research infrastructure is a complex task, especially when a large fraction of the equipment is delivered as in-kind contributions. A mature project management approach is essential to lead the planning and construction to deliver scientifically and technically. The purpose of this paper is to present how the ESS accelerator project is managed in terms of planning and scheduling from the design phase until commissioning, keeping time, budgets and resources constraints, as well as creating and maintaining a strong and trust-based partnership with the external contributors.

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FRXB1

The DOE Long-Term Accelerator R&D Stewardship Program

laser, cyclotron, ion, experiment

4082

E.R. Colby
OHEP/DOE, Germantown, Maryland, USA
M. Farkhondeh
DOE/NP, Germantown, USA
E.S. Lessner
DOE/BES, Germantown, Maryland, USA
M.S. Zisman
US DOE, Washington, USA

Funding: U. S. Department of Energy, Office of Science
Since the Accelerators for America's Future (AfAF) Symposium in 2009, the U. S. Dept. of Energy's Office of High Energy Physics (DOE-HEP) has worked to broaden its accelerator R&D activities beyond supporting only discovery science to include medicine, energy and environment, defense and security, and industry. Accelerators play a key role in many aspects of everyday life, and improving their capabilities will enhance U.S. economic competitiveness and the scientific research that drives it. Funded for the first time in 2014, the DOE Office of Science Accelerator Stewardship Program has launched initiatives to facilitate access to DOE accelerator infrastructure, develop innovative accelerator technologies that solve critical problems, and catalyze new partnerships across the accelerator user community. We will discuss the formulation and evolution of the Accelerator Stewardship program, the current status of initiatives, and plans for engagement with the accelerator and user communities for future stewardship activities.

Slides FRXB1 [3.429 MB]

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