IPAC2015 - List of Keywords (storage-ring)

Paper	Title	Other Keywords	Page
MOAD3	Relative Alignment Within the MAX IV 3 GeV Storage Ring Magnet Blocks	alignment, synchrotron, magnet-design, quadrupole	57
	J.H. Björklund Svensson, M.A.G. Johansson MAX-lab, Lund, Sweden
	Unlike the discrete magnet scheme of previous 3rd generation light sources, the magnet elements of the MAX IV storage rings are integrated in precision-machined magnet blocks. By analyzing the rotating coil measurements made by the magnet suppliers, we determined the relative alignment between consecutive magnet elements, which was found to be <10 microns RMS for all magnet block types in both horizontal and vertical direction. This article presents our analysis and results for the full magnet production series.
	Slides MOAD3 [1.825 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOAD3
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MOPWA015	Lattice Correction using LOCO for the ThomX Storage Ring	quadrupole, optics, lattice, coupling	117
	I. Chaikovska, C. Bruni, S. Chancé, A. Variola, J.F. Zhang LAL, Orsay, France A. Loulergue SOLEIL, Gif-sur-Yvette, France
	Funding: Work is supported by the French Agence Nationale de la Recherche as part of the program EQUIPEX under reference ANR-10-EQPX-51, the Ile de France region, CNRS-IN2P3 and Université Paris Sud XI ThomX is a compact Compton based X-ray source under construction at LAL in Orsay (France). The ThomX accelerator facility is composed by a 50-70 MeV linac driven by 3 GHz RF gun, a transfer line and a 18 meters long Storage Ring (SR). The Compton backscattering at each revolution between the 1 nC electron bunch and the 25 mJ laser pulses stacked in the Fabry-Perot cavity results in the production of ~10¹³ photons per second with energies in the X-ray regime. This high flux of the X-rays strongly depends on the quality (beam sizes) of the electron beam at the interaction point. To guarantee this, a good knowledge and quality of the linear lattice of the ThomX SR are required. Nowadays, LOCO (Linear Optics from Closed Orbits) is a well-known and widely used algorithm to measure and restore the linear optics of the SRs and ensure the designed performances. Comparing the measured and model orbit response matrices, the linear lattice can be restored by retuning the quadrupole gradients. In this paper, we report on the LOCO analysis of the ThomX SR taking into account simulated misalignment, calibration and field errors.
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MOPWA032	Aspects of SRF Cavity Optimization for BESSY-VSR Upgrade	cavity, HOM, SRF, higher-order-mode	171
	T. Galek, K. Brackebusch, T. Flisgen, J. Heller, U. van Rienen Rostock University, Faculty of Computer Science and Electrical Engineering, Rostock, Germany B.D. Isbarn, B. Riemann, M. Sommer, T. Weis DELTA, Dortmund, Germany
	Funding: Work supported by Federal Ministry for Research and Education BMBF under contract 05K13HR1. In this work we present a preliminary study of a long chain of cavities and some aspects involved in the optimization procedure. It is important to numerically model and optimize the SRF cavities with respect to external quality factors of the most dangerous higher order modes. BESSY-VSR is an upgrade scheme for the existing BESSY II storage ring aiming to simultaneously support variable electron pulse lengths. Currently, BESSY II supports long 15 ps bunches in the standard user optics configuration and short 1.5 ps bunches in a so-called low-α optics mode. In order to develop BESSY II into a variable electron pulse length storage ring, additional two sets of SRF higher-harmonic cavities will be installed. The present RF acceleration system operates at 0.5 GHz and the additional 3rd harmonic and 3rd sub-harmonic cavities will operate at 1.5 GHz and 1.75 GHz, respectively. These cavities are essential to produce short 1.5 ps bunches with a design current of up to 0.8 mA per bunch. The total current in the storage ring is limited by the higher order mode damping capabilities of the SRF cavities.
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MOPWA034	Coupled-Bunch Instability Suppression Using RF Phase Modulation at the DELTA Storage Ring	damping, synchrotron, electron, feedback	179
	M. Sommer, M. Höner, B.D. Isbarn, S. Khan, B. Riemann, T. Weis DELTA, Dortmund, Germany
	Funding: Work supported by the BMBF under contract no. 05K13PEB The upcoming upgrade of BESSY II, called BESSY-VSR, involves the utilization of superconducting multicell RF-resonators with high accelerating gradients to provide short and long bunches in an electron storage ring simultaneously. Even under the assumption of strongest available damping of beam induced modes, the residual impedances of the cavities may cause collective multibunch instabilities at the frontier of stability available from current bunch-by-bunch feedback systems. At the DELTA electron storage ring, a phase modulation of the driving RF is used to suppress coupled-bunch instabilities and to increase the lifetime. The time dependent frequency variation in the order of the synchrotron frequency gives rise to additional damping of the bunch oscillators by decoherence and Landau damping. The behaviour and the additional damping of the bunch oscillators is investigated by the existing bunch-by-bunch feedback system e.g. the increase of the overall damping might support the capability of feedback systems under extreme operating conditions of BESSY-VSR. G. Wüstefeld et al., Proc. of IPAC'11, San Sebastián, THPC014
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MOPWA035	Two General Orbit Theorems for Efficient Measurements of Beam Optics	closed-orbit, optics, dipole, lattice	183
	B. Riemann, A. Ferrarotto, P. Hartmann, B.D. Isbarn, S. Koetter, M. Sommer, P. Towalski, T. Weis DELTA, Dortmund, Germany
	Closed-orbit perturbations and oscillating beam solutions in storage rings are closely related. While techniques exist to fit accelerator models to closed-orbit perturbations or to oscillation data, the exploitation of their relation has been limited. In this work, two orbit theorems that allow an efficient computation of optical parameters in storage rings with older hardware are derived for coupled linear beam motion. The monitor theorem is based on an uncoupled case study described by the author in an earlier work and has been generalized as well as simplified in mathematical abstraction to provide a reliable and computationally stable framework for beam optics measurements. It is based on a closed-orbit measurement utilizing 4 dipole correctors (2 for each plane). The corrector theorem allows to obtain parameters of these dipole correctors using two turn-by-turn monitors at almost arbitrary positions in the ring (which do not need to be located in a drift space), so that it is possible to uniquely resolve closed orbits into optical parameters without sophisticated lattice models.
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MOPWA044	Quasi-frozen Spin Method for EDM Deuteron Search	dipole, proton, simulation, lattice	213
	Y. Senichev, A. Lehrach, B. Lorentz, R. Maier FZJ, Jülich, Germany S.N. Andrianov, A.N. Ivanov St. Petersburg State University, St. Petersburg, Russia M. Berz, E. Valetov MSU, East Lansing, Michigan, USA S. Chekmenev RWTH, Aachen, Germany
	To search for EDM using proton storage ring with purely electrostatic elements the concept of frozen spin method has been proposed by BNL. This method is based on two facts: in the equation of the spin precession the magnetic field dependence is entirely eliminated and at “magic” energy the spin precession frequency coincides with the precession frequency of the momentum. In case of deuteron the anomalous magnetic moment is negative (G=-0.142), therefore we have to use the electrical and magnetic field simultaneously keeping the frozen spin direction along the momentum as in the pure electrostatic ring. In this article we suggest the concept of the quasi-frozen spin when the spin oscillates around the momentum direction within the half value of the advanced spin phase each time returning back by special optics. Due to the low value of the anomalous magnetic moment of deuteron an effective contribution to the expected EDM effect is reduced only by a few percent.
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MOPJE003	Measuring Duke Storage Ring Lattice Using Tune Based Technique	quadrupole, lattice, electron, wiggler	293
	W. Li, J.Y. Li USTC/NSRL, Hefei, Anhui, People's Republic of China H. Hao, W. Li, S.F. Mikhailov, V. Popov, Y.K. Wu FEL/Duke University, Durham, North Carolina, USA
	Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033. The Duke electron storage ring is a dedicated driver for oscillator Free-Electron Lasers (FELs). A 34 m long straight section of the storage ring is used to host up to four FEL wigglers in several different configurations. A total of six wigglers, two planar OK-4 wigglers and four helical OK-5 wigglers, are available for FEL research. The storage ring magnetic lattice has to be designed with great flexibility to enable the storage ring operation with different FEL wigglers, at various wiggler settings, and for different electron beam energies. Since 2012, the storage ring has demonstrated all designed characteristics in terms of lattice flexibility and tuning. This work is aimed at gaining better understanding of the real storage ring lattice by performing a series of measurements of the beta-functions along the storage ring. Unlike the LOCO technique, the beta-functions in the quadrupoles are directly measured with good accuracy using a tune meassurement system. We will describe our experimental design and techniques, and measurement procedures. We will also report our preliminary results for the lattice characterization.
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MOPJE009	Lattice Design of the SSRF-U Storage Ring	emittance, lattice, dynamic-aperture, injection	304
	S.Q. Tian, B.C. Jiang, M.Z. Zhang, Q.L. Zhang, Z.T. Zhao SINAP, Shanghai, People's Republic of China
	Multi-Bend Achromatic (MBA) cell has been well known to significantly reduce the beam emittance of the synchrotron radiation light sources in the past two decades. With the great development of the high gradient magnets, the small-aperture vacuum chamber and the precise alignment, the ultimate-emittance ring based on MBA lattice became practical in recent years. We present a preliminary lattice design for the upgraded SSRF storage ring based on a 7BA lattice in this paper. The circumference and the number of the straight sections are preserved for the existing tunnel. The beam energy is reduced to 3 GeV, and the beam emittance is reduced to about 200 pm.rad. The optimized dynamic aperture is about 10 mm in the horizontal plane, and a sufficient beam injection based on the closed orbit bump can be implemented.
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MOPJE026	Revision of the Impedance Model for the Interpretation of the Single Bunch Measurements at ALBA	impedance, vacuum, undulator, simulation	330
	T.F.G. Günzel, U. Iriso ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	Recent measurements showed that the ALBA transverse impedance model was able to explain 65% of the measured single bunch vertical detuning. * This report shows the revision of the impedance model developed to match latest single bunch measurements performed to evaluate the total effective machine impedance and impedance of specific elements, like in-vacuum undulators or a recently installed pinger magnet. The model improvement includes a better bunch length parameterisation, re-calculation of several vacuum chamber elements with Gdfidl, and inclusion of elements neglected so far in the impedance budget. We also show and discuss the computation of the resistive wall impedance using ImpedanceWake2D. * T.Günzel, U.Iriso, F.Perez, E.Koukovini-Platia, G.Rumolo, "Analysis of the single bunch measurements at the ALBA Storage Ring", TUPRI052, proc. of IPAC14 (2014).
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MOPJE028	Detailed Characterization of ALBA Quadrupoles for Beta Function Determination	quadrupole, synchrotron, optics, controls	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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MOPJE033	Coupled Orbit Response Coefficients with Constant Revolution Time	optics, closed-orbit, radio-frequency, diagnostics	354
	V.G. Ziemann Uppsala University, Uppsala, Sweden
	We calculate orbit response coefficients for arbitrarily coupled lattice which keep the orbit length constant as is needed to maintain synchronicity with a radio-frequency system.
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MOPMA002	Optimising the Diamond DDBA Upgrade Lattice for Low Alpha Operation	lattice, optics, injection, dynamic-aperture	525
	I.P.S. Martin, R. Bartolini DLS, Oxfordshire, United Kingdom R. Bartolini JAI, Oxford, United Kingdom
	The Diamond storage ring will be upgraded during 2016 by replacing one of the existing double bend achromat (DBA) cells with a double-DBA (DDBA) cell. One requirement of the upgrade is that following the installation of the new cell, Diamond should continue to offer dedicated user time in ‘low alpha’ mode. In this paper we describe the particular challenges relating to this task, and present the lattice design and optimisation studies undertaken so far. The paper concludes by discussing preliminary studies of adding a second DDBA cell into the storage ring. R.P. Walker et al., Proc. IPAC 2014, MOPRO103, (2014) ** I.P.S. Martin et al., Proc. IPAC 2013, MOPEA070, (2013)
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MOPMA003	Reconstruction of Electron Bunch Motion During CSR Bursts using Synchronised Diagnostics	electron, detector, synchrotron, radiation	529
	I.P.S. Martin, R. Bartolini, C. Bloomer, L.M. Bobb, G. Rehm DLS, Oxfordshire, United Kingdom R. Bartolini, A. Finn JAI, Oxford, United Kingdom
	Above a certain threshold current, electron bunches become unstable and emit bursts of coherent synchrotron radiation (CSR). The character and periodicity of these bursts vary with bunch current, RF voltage and lattice momentum compaction. In this paper we describe recent measurements taken at Diamond of how the electron bunch longitudinal profile and energy vary during a burst, and correlate this with CSR emission at a range of wavelengths.
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MOPMA006	Modeling RF Feedback in Elegant for Bunch-Lengthening Studies for the Advanced Photon Source Upgrade	feedback, cavity, injection, impedance	540
	T.G. Berenc, M. Borland 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 proposed Advanced Photon Source (APS) multi-bend achromat (MBA) lattice includes a passive bunch-lengthening cavity to alleviate lifetime and emittance concerns. Feedback in the main radio-frequency (rf) system affects the overall impedance presented to the beam in this double rf system. To aid beam stability studies, a realistic model of rf feedback has been developed and implemented in elegant and Pelegant.
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MOPMA008	Simulation of Gas-Scattering Lifetime using Position- and Species-Dependent Pressure and Aperture Profiles	scattering, vacuum, simulation, photon	546
	M. Borland, J.A. Carter, H. Cease, B.K. Stillwell 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. When computing gas-scattering lifetime for storage rings, it is common to use the average pressure, even though it is known that the pressure varies with location in the ring and varies differently for different gas species. In addition, other simplifications are commonly made, such as assuming that the apertures in the horizontal and vertical planes are independent and assuming that the momentum acceptance can be characterized by a single value. In this paper, we describe computation of the elastic- and bremsstrahlung-scattering lifetimes that includes species-specific gas pressure profiles computed with VACCALC and MOLFLOW. In addition, the computations make use of the detailed shape of the dynamic acceptance and the position-dependent momentum acceptance. Comparisons are made to simpler methods for the Advanced Photon Source storage ring and the multi-bend achromat upgrade lattice.
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MOPMA013	Experience with Round Beam Operation at the Advanced Photon Source	coupling, emittance, operation, resonance	562
	A. Xiao, L. Emery, V. Sajaev, B.X. Yang 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 Very short Touschek lifetime becomes a common issue for next-generation ultra-low emittance storage ring light sources. In order to reach a longer beam lifetime, such a machine often requires operating with a vertical-to-horizontal emittance ratio close to an unity, i.e. a ‘‘round beam''. In tests at the APS storage ring, we determined how a round beam can be reached experimentally. Some general issues, such as beam injection, optics measurement and corrections, and orbit correction have been tested also. To demonstrate that a round beam was achieved, the beam size ratio is calibrated using beam lifetime measurement.
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MOPMA015	Applications of an MPI Enhanced Simulated Annealing Algorithm on nuSTORM and 6D Muon Cooling	sextupole, lattice, simulation, emittance	568
	A. Liu Fermilab, Batavia, Illinois, USA
	The nuSTORM decay ring is a compact racetrack storage ring with a circumference ∼ 480 m using large aperture (∅=60 cm) magnets. The design goal of the ring is to achieve a momentum acceptance of 3.8±10\% GeV/c and a phase space acceptance of 2000 μm·rad. The design has many challenges because the acceptance will be affected by many nonlinearity terms with large particle emittance and/or large momentum offset. In this paper, we present the application of a meta-heuristic optimization algorithm to the sextupole correction in the ring. The algorithm is capable of finding a balanced compromise among corrections of the nonlinearity terms, and finding the largest acceptance. This technique can be applied to the design of similar storage rings that store beams with wide transverse phase space and momentum spectra. We also present the recent study on the application of this algorithm to a part of the 6D muon cooling channel. The technique and the cooling concept will be applied to design a cooling channel for the extracted muon beam at nuSTORM in the future study.
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MOPMA030	Multisymplectic Integrators for Accelerator Tracking Codes	space-charge, plasma, simulation, DTL	614
	S.D. Webb, D.L. Bruhwiler RadiaSoft LLC, Boulder, Colorado, USA
	It has been long understood that long time single particle tracking requires symplectic integrators to keep the simulations stable. In contrast, space charge has been added to tracking codes without much regard for this. Indeed, multisymplectic integrators are a promising new field which may lead to more stable and accurate simulations of intense beams. We present here the basic concept, through a spectral electrostatic field solve which is suitable for adapting into existing tracking codes. We also discuss the limitations of current algorithms, and suggest directions for future development for the next generations of high intensity accelerators.
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MOPMA053	Characterizing Betatron Tune Knobs on Duke Storage Ring	wiggler, lattice, operation, betatron	672
	H. Hao, 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. The Duke electron storage ring is a dedicated driver for oscillator Free-Electron Lasers (FELs). A 34-m long straight section of the storage ring can host up to four FEL wigglers in several different configurations. The storage ring magnetic lattice has designed with great flexibility to enable the operation with different wiggler configurations and at different electron beam energies. To realize smooth storage ring operation with various electron beam and wiggler parameters, a sophisticated lattice feedforward compensation scheme and a set of betatron tune knobs have been designed, developed and implemented in the controls system. The built-in compensation and tune knobs have demonstrated to be highly useful to allow transparent operation of the storage ring. To fully understand the effectiveness of the lattice tuning scheme, experiments have been carried to characterize the betatron tune knobs. In this paper, we will outline the measurement techniques and procedures, report experimental results, and make important observations on the usefulness of developing an advanced light source storage ring using accurate knowledge of individual magnets with high-quality measured fields.
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MOPMA055	MuSim, a Graphical User Interface for Multiple Simulation Programs	simulation, interface, detector, target	678
	T.J. Roberts Muons, Inc, Illinois, USA P.L. Gueye Hampton University, Hampton, Virginia, USA
	MuSim is a new user-friendly program designed to interface to many different particle simulation codes, regardless of their data formats or geometry descriptions. It presents the user with a compelling graphical user interface that includes a flexible 3-D view of the simulated world plus powerful editing and drag-and-drop capabilities. All aspects of the design can be parametrized so that parameter scans and optimizations are easy. It is simple to create plots and display events in the 3-D viewer (with a slider to vary the transparency of solids), allowing for an effortless comparison of different simulation codes. Simulation codes: G4beamline, MAD-X, and MCNP; more coming. Many accelerator design tools and beam optics codes were written long ago, with primitive user interfaces by today’s standards. MuSim is specifically designed to make it easy to interface to such codes, providing a common user experience for all, and permitting the construction and exploration of models with very little overhead. For today’s technology-driven students, graphical interfaces meet their expectations far better than text-based tools, and education in accelerator physics is one of our primary goals.
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MOPMA056	Measurement and Modeling of Single Bunch Wake Field Effects in CESR	emittance, simulation, impedance, wakefield	681
	J.R. Calvey, M.G. Billing, W. Hartung, J.D. Perrin, D. L. Rubin, D. Sagan, S. Wang Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Funding: Work supported by NSF PHY-1416318 and NSF DMR 1332208. This research used the National Energy Research Scientific Computing Center, which is supported by DOE Contract No. DE-AC02-05CH11231. Short-range wake fields have been incorporated into a Bmad-based particle tracking code in order to assess their contribution to current-dependent emittance growth, tune shift, and single bunch instabilities. The wakes are computed for CESR vacuum components using the T3P modeling software. Simulation results are compared with measurements of bunch length, vertical beam size, and coherent tune shift. Additionally, we use insertable scrapers to vary the transverse wake and measure the effect on the beam. We show that a vertical emittance increase at high current may be due to a transverse monopole wake, originating in the lump pump slots throughout CESR.
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MOPMA060	Impedance Measurement for the SPEAR3 Storage Ring	impedance, lattice, vacuum, damping	694
	X. Huang, J.J. Sebek SLAC, Menlo Park, California, USA
	We studied the transverse impedance of the SPEAR3 storage ring with tune shift vs. beam intensity, head-tail instability and transverse mode coupling instability measurements. By taking measurements under different machine conditions, we probed the frequency dependence of the impedance, from which an impedance model was built. This model is consistent with instability measurements and previous bunch lengthening results.
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MOPMN016	Decoherence due to Second Order Chromaticity in the NSLS-II Storage Ring	betatron, synchrotron, damping, lattice	737
	G. Bassi, A. Blednykh, J. Choi, V.V. Smaluk BNL, Upton, Long Island, New York, USA
	We study decoherence effects due to second order chromaticity for small amplitude kicks, in order to estimate the energy spread from TbT data of the NSLS-II storage ring. The bare lattice case (no Damping Wigglers and Insertion devices) has been considered, due to the long transverse radiation damping time. To minimize the chromatic damping/antidamping from the slow-head tail effect, we used a short train of bunches distributed over consecutive rf-buckets with a high enough average current to obtain a good BPM signal. The vertical and horizontal betatron motion have been excited independently with pinger magnets. In this contribution we limit the discussion to the horizontal case.
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MOPMN020	Longitudinal Impedance of RHIC	synchrotron, impedance, experiment, scattering	746
	M. Blaskiewicz, J.M. Brennan, K. Mernick 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. The longitudinal impedance of the two RHIC rings has been measured using the effect of potential well distortion on longitudinal Schottky measurements. With Z/n about 5 Ω the impedance of the yellow ring is roughly twice that of the blue ring.
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MOPMN021	NSLS-II Storage Ring BPM Button Development	vacuum, impedance, simulation, multipole	748
	A. Blednykh, B. Bacha, G. Bassi, W.X. Cheng, C. Hetzel, B.N. Kosciuk, D. Padrazo, O. Singh BNL, Upton, Long Island, New York, USA
	Funding: Work supported by DOE contract DE-AC02-98CH10886 The NSLS-II BPM Button design and its development process have been described. Subjects discussed include BPM Button impedance optimization, design and construction, production, BPM Button selection and a first temperature measurements at 200mA average current within 1200 bunches.
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MOPMN027	Optimization of Dynamic Aperture for Hadron Lattices in eRHIC	sextupole, lattice, hadron, collider	757
	Y.C. Jing, V. Litvinenko, D. Trbojevic 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. The potential upgrade of the Relativistic Heavy Ion Collider (RHIC) to an electron ion collider (eRHIC) involves numerous extensive changes to the existing collider complex. The expected very high luminosity is planned to be achieved at eRHIC with the help of squeezing the beta function of the hadron ring at the IP to a few cm, causing a large rise of the natural chromaticities and thus bringing with it challenges for the beam long term stability (Dynamic aperture). We present our effort to expand the DA by carefully tuning the nonlinear magnets thus controlling the size of the footprints in tune space and all lower order resonance driving terms. We show a reasonably large DA through particle tracking over millions of turns of beam revolution.
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MOPHA001	Transverse Bunch by Bunch Feedback Operations at the Australian Synchrotron Light Source	feedback, operation, resonance, synchrotron	769
	R.T. Dowd, M.P. Atkinson, M.J. Boland, G. LeBlanc, Y.E. Tan, K. Zingre SLSA, Clayton, Australia
	The Australian Synchrotron light source has recently put in operation its transverse bunch-by-bunch feedback system during user beam mode. Getting to the stage of stable operation has been a long road and this paper will outline the many difficulties that were encountered. Chief among these are the apparent strong, high frequency, vertical resonances that appear when the storage ring's three in-vacuum undulators are closed to specific gaps. The behaviour of these resonances and their effects on achieving stable feedback operation will be explored in detail.
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MOPHA009	Single-Shot Electro-Optic Sampling Combined With Photonic Time-Stretch: Detailed Results at SOLEIL	laser, synchrotron, detector, real-time	795
	C. Szwaj, C. Evain, E. Roussel PhLAM/CERLA, Villeneuve d'Ascq, France S. Bielawski PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France J.B. Brubach, L. Cassinari, M.-E. Couprie, M. Labat, L. Manceron, J.P. Ricaud, P. Roy, M.-A. Tordeux SOLEIL, Gif-sur-Yvette, France M. Le Parquier CERLA, Villeneuve d'Ascq, France
	Funding: ANR (DYNACO project), FEDER, CEMPI LABEX. Single-shot recording of pulses is possible with high repetition rates (more than 80 MHz), as was demonstrated in the framework of a PhLAM-SOLEIL collaboration * *. This can be achieved by a relatively simple upgrade of existing setups based on spectral encoding. The strategy consists to encode the sub-picosecond information into the time domain, but at a slower scale (nanoseconds), using dispersion in a long optical fiber. Then the information is recorded by a photodiode connected to an oscilloscope. In this poster, we present guidelines for the practical realization of the electro-optical setup, as well as a performance analysis. In particular, we analyze the temporal resolution and compare it to the classical electro-optical sampling setup. E. Roussel et al., Proceedings of IPAC2014, THOBA01. ** E. Roussel et al., arXiv:1410.7048
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MOPHA039	A Fast Gated Intensified Camera Setup for Transversal Beam Diagnostics at the ANKA Storage Ring	radiation, experiment, synchrotron, bunching	872
	P. Schütze, A. Borysenko, E. Hertle, N. Hiller, B. Kehrer, A.-S. Müller, P. Schönfeldt KIT, Karlsruhe, Germany
	ANKA, the synchrotron light source at Karlsruhe Institute of Technology (KIT), can be operated in different modes including the short bunch operation with bunch lengths compressed to a few picoseconds. In this mode, coherent synchrotron radiation (CSR) is emitted leading to beam instabilities. For gaining further insight into those processes, a setup based on a fast gated intensified camera was installed recently at the visible light diagnostics beamline of the ANKA storage ring. The experimental layout consists of an optical setup, which magnifies the image of the beam in the horizontal and demagnifies it in the vertical plane to obtain a projection of the horizontal beam shape, the camera itself and a fast scanning galvanometric mirror that sweeps this image across the sensor. This allows the tracking of the horizontal bunch size and position over many turns. In this paper we present the setup and show first measurement results.
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MOPHA040	First Results of Energy Measurements with a Compact Compton Backscattering Setup at ANKA	laser, electron, photon, detector	876
	C. Chang, E. Bründermann, E. Hertle, N. Hiller, E. Huttel, A.-S. Müller, M.J. Nasse, M. Schuh, J.L. Steinmann KIT, Karlsruhe, Germany H.-W. Hübers, H. Richter DLR, Berlin, Germany
	Funding: This work is funded by the European Union under contract PITN-GA-2011-289191 An electron energy measurement setup based on the detection of Compton backscattered photons, generated by laser light scattered off the relativistic electron beam, has been proposed and developed for operation at the ANKA storage ring of the Karlsruhe Institute of Technology (KIT). In contrast to conventional methods based on head-on collisions, the setup at ANKA is, for the first time, realized in a transverse configuration where the laser beam hits the electron beam at an angle of ~90°. This makes it possible to achieve a relatively low-cost and very compact setup since it only requires a small side-port instead of a straight section. This development could benefit storage rings with restricted space or where no straight sections are available, for example due to interferences with existing beamlines. The setup and the first measurement results are presented in the paper.
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MOPTY034	Distributed Beam Loss Monitor Based on the Cherenkov Effect in Optical Fiber	electron, radiation, positron, beam-losses	1004
	Yu. Maltseva, F.A. Emanov, A.V. Petrenko, V.G. Prisekin BINP SB RAS, Novosibirsk, Russia F.A. Emanov NSU, Novosibirsk, Russia A.V. Petrenko CERN, Geneva, Switzerland
	A distributed beam loss monitor based on the Cherenkov effect in optical fiber has been implemented for the VEPP5 electron and positron linacs and the 510 MeV damping ring at the Budker INP. The monitor operation is based on detection of the Cherenkov radiation generated in optical fiber by means of relativistic particles created in electromagnetic shower after highly relativistic beam particles (electrons or positrons) hit the vacuum pipe. The main advantage of the distributed monitor compared to local ones is that a long optical fiber section can be used instead of a large number of local beam loss monitors. In our experiments the Cherenkov light was detected by photomultiplier tube (PMT). Timing of PMT signal gives the location of the beam loss. In the experiment with 20 m long optical fiber we achieved 3 m spatial resolution. To improve spatial resolution optimization and selection process of optical fiber and PMT are needed and according to our theoretical estimations 0.5 m spatial resolution can be achieved. We also suggest similar techniques for detection of electron (or positron) losses due to Touschek effect in storage rings.
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MOPTY044	Machine Protection Systems and their Impact on Beam Availability and Accelerator Reliability	operation, linac, software, proton	1029
	R. Andersson, E. Bargalló, A. Nordt ESS, Lund, Sweden E. Adli University of Oslo, Oslo, Norway
	Over the last decades, the complexity and performance levels of machine protection have developed. The level of reliability and availability analysis prior to operation differs between facilities, just as the pragmatic changes of the machine protection during operation. This paper studies the experience and development of machine protection for some of the state of the art proton and ion accelerators, and how it relates to reducing damage to and downtime of the machine. The findings are discussed and categorized, with emphasis on proton accelerators. The paper is concluded with some recommendations for a future high power linear proton accelerator.
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MOPTY065	Beam Stability of the Taiwan Light Source Storage Ring	betatron, electron, injection, network	1091
	H.C. Chen, H.H. Chen, Y.-S. Cheng, S.J. Huang, C.H. Kuo, J.A. Li, Y.K. Lin NSRRC, Hsinchu, Taiwan
	The Taiwan Light Source Storage Ring (SR) has been in operation since many years ago. Maintaining best stability of the electron beam is becoming the main challenge. This study endeavored to improve the electron beam stability of The Taiwan Light Source Storage Ring (SR). Employing the artificial neural network (ANN)-constructed experiment design to analyze and optimize the storage ring betatron tunes .This report outlines the details of the beam stability process experiment.
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MOPTY072	Beam Loss Study of TLS Using RadFETs	injection, radiation, controls, 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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MOPTY073	Commissioning of BPM System for TPS Booster Synchrotron	booster, electronics, synchrotron, injection	1106
	P.C. Chiu, Y.-S. Cheng, K.T. Hsu, K.H. Hu, C.H. Kuo NSRRC, Hsinchu, Taiwan
	The TPS is a latest generation of high brightness synchrotron light source and ready for commissioning. It consists of a 150 MeV electron linac, a booster synchrotron, a 3 GeV storage ring, and experimental beam lines. The BPM electronics Libera Brilliance⁺ are adopted for booster and storage ring of Taiwan Photon Source (TPS). The provided BPM data is useful for beam commissioning where it can be used to measure beam position, rough beam intensity along the longitudinal position and also for tune measurement. This report summarizes the efforts on BPM measurement and related diagnostic tools during TPS booster commissioning.
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MOPTY074	Preliminary Beam Test of Synchrotron Radiation Monitoring System at Taiwan Photon Source	synchrotron, booster, radiation, synchrotron-radiation	1109
	C.Y. Liao, Y.-S. Cheng, J. -Y. Chuang, K.T. Hsu, S.Y. Hsu, H.P. Hsueh, K.H. Hu, C.K. Kuan, C.Y. Wu NSRRC, Hsinchu, Taiwan
	Taiwan Photon Source (TPS) is a third generation 3 GeV synchrotron light facility. The synchrotron radiation from a dipole can be used to observe the beam parameters. The synchrotron radiation monitor (SRM) systems were designed and implemented for the booster synchrotron and storage ring. The SRM for the booster synchrotron can serve to diagnose the energy ramping process. The beam size decreases when the energy increases was observed. In the storage ring, the streak camera was preferred to observe the beam behaviour of the consecutive bunches. The bunch length and longitudinal instability were observed. The preliminary beam test results are summarized in this report.
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MOPTY075	Vibration Measurement of the Magnets in the Storage Ring of TPS	quadrupole, ground-motion, dipole, data-acquisition	1112
	C.H. Huang, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, D. Lee, C.Y. Liao NSRRC, Hsinchu, Taiwan
	Taiwan photon source is a 3rd generation synchrotron light source which is in beam commissioning at NSRRC. Orbit stability within 100 nm range is essential for such a small emittance light source. Technical noise from the vacuum pumps, water flow, etc. will cause the vibration of quadrupoles and deleterious orbit stability. In order to investigate the magnitude of vibration in the magnets of the storage ring, the vibration spectra of the lattice quadruples; the coherence between the magnets, girders and ground will be systematic investigated in this report.
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MOPTY079	The Installation and Operation of TPS Laser PSD System in TPS Storage Ring	laser, alignment, operation, electron	1123
	M.L. Chen, J.-R. Chen, P.S.D. Chuang, H.C. Ho, K.H. Hsu, D.-G. Huang, C.K. Kuan, W.Y. Lai, C.J. Lin, S.Y. Perng, T.C. Tseng, H.S. Wang NSRRC, Hsinchu, Taiwan
	24 sets of Laser PSD positioning system are parts of the TPS girder auto¬alignment system. Laser PSD positioning systems are installed in the straight¬ section girders of TPS storage ring. The Laser PSD systems are assembled and calibrated in the Lab beforehand. The Laser and PSDs are assembled on girder and transported to TPS storage ring and Installed. During construction the system deviates from the normal position caused by variant temperature and external influence. For absolute position precision, another laser calibration system should be built to recalibrate the laser PSD system. This paper describes the installation of Laser PSD system in TPS storage ring and the status of the PSD system. A new absolute position calibration method for precision upgrade is also discussed.
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MOPTY080	A Multi-band Single Shot Spectrometer for Observation of mm-Wave Bursts at Diamond Light Source	detector, synchrotron, radiation, synchrotron-radiation	1126
	A. Finn, P. Karataev JAI, Egham, Surrey, United Kingdom G. Rehm DLS, Oxfordshire, United Kingdom
	Micro-bunch instabilities (MBI) have been detected at many light sources across the world. The radiation bursts produced as a result of this instability occur in the millimetre wavelength regime. In order to understand more about the mechanism of MBI and improve the accuracy of simulations, more information is needed about the dynamics and spectral content of the radiation. A single shot spectrometer has therefore been developed to investigate this instability at Diamond Light Source. Due to their low noise, ultra-fast response and excellent sensitivity, Schottky detector diodes are employed. Currently, seven Schottky detectors are in place covering a range of 33-750 GHz. Unlike previous measurements at Diamond, each of the Schottky detectors has been characterised thus allowing the results obtained to be more easily compared to simulations. In this paper, we present the calibration of each Schottky detector in the spectrometer, the first results of tests with beam, as well as future plans for the spectrometer.
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MOPWI006	Development of a Supersonic Gas-jet Monitor to Measure Beam Profile Non-destructively	ion, vacuum, electron, experiment	1157
	H.D. Zhang, A. Jeff, V. Tzoganis, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom A. Jeff CERN, Geneva, Switzerland A. Jeff, V. Tzoganis, C.P. Welsch, H.D. Zhang The University of Liverpool, Liverpool, United Kingdom V. Tzoganis RIKEN, Saitama, Japan
	Funding: This project is supported by Helmholtz Association(VH-NG-328), EU’s 7th Framework Program for research, technological development and demonstration( 215080) and STFC Cockcroft core grant(ST/G008248/1). The measurement of the transverse beam profile is a great challenge for high intensity, high brightness and high power particle beams due to their destructive power. Current non-destructive methods such as residual gas monitors and beam induced fluorescence monitors either require a rather long integration time or residual gas pressures in the order of 10^-7 mbar to make meaningful measurements. A supersonic gas-jet beam profile monitor has been developed by QUASAR group at the Cockcroft Institute, UK and promises significant improvements over these established techniques. In this monitor, a supersonic gas curtain is generated that crosses the beam to be analyzed under an angle of 45°. When both beams interact, ionization of the gas jet particles occurs and these ions are then accelerated by an electrostatic extraction field towards a Micro Channel Plate (MCP). Beam images are then obtained via a phosphor screen-CCD camera combination. In this contribution, we discuss the monitor design and present beam profile measurements of a 5 keV electron beam. These are complemented by results from measurements using a pulsed valve to study the gas jet dynamics.
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MOPWI022	Experimental Study of a Two-Color Storage Ring FEL	FEL, wiggler, operation, electron	1198
	J. Yan, H. Hao, S.F. Mikhailov, V. Popov, Y.K. Wu FEL/Duke University, Durham, North Carolina, USA S. Huang PKU, Beijing, People's Republic of China J.Y. Li USTC/NSRL, Hefei, Anhui, People's Republic of China N. Vinokurov BINP SB RAS, Novosibirsk, Russia J. Wu SLAC, Menlo Park, California, USA
	Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033. Multi-color Free-electron Lasers (FELs) have been developed on linac based FELs over the past two decades. On the storage ring, the optical klystron (OK) FEL in its early days was demonstrated to produce lasing at two adjacent wavelengths with their spectral separation limited by the bandwidth of single wiggler radiation. Here, we report a systematic experimental study on the two-color operation at the Duke FEL facility, the first experimental demonstration of a tunable two-color harmonic FEL operation of a storage ring based FEL. We demonstrate a simultaneous generation of two FEL wavelengths, one in infrared (IR) and the other in ultraviolet (UV) with a harmonic relationship. The experimental results show a good performance of the two-color FEL operation in terms of two-color wavelength tunability, power tunability and power stability.
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MOPWI030	Low Emittance Tuning With a Witness Bunch	betatron, emittance, lattice, coupling	1223
	D. L. Rubin, R.E. Meller, J.P. Shanks Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Funding: Work supported by NSF PHY-1416318, PHY-0734867 and PHY-1002467, and DOE DE-FC02-08ER- 41538 and DE-SC0006505 Electron positron damping rings and colliders will require frequent tuning to maintain ultra-low vertical emittance. Emittance tuning begins with precision beam based measurement of lattice errors (orbit, transverse coupling, and dispersion) followed by compensation with corrector magnets. Traditional techniques for measuring lattice errors are incompatible with simultaneous operation of the storage ring as light source or damping ring. Dedicated machine time is required. The gated tune tracker (the device that drives the beam at the normal mode frequencies) and the bunch-by-bunch, turn-by-turn beam position monitor system developed at CESR are integrated to allow synchronous detection of phase. The system is capable of measuring lattice errors during routine operation. A single bunch at the end of a train of arbitrary length, is designated as the witness. The witness bunch alone is resonantly excited, and the phase and amplitude of the witness is mea- sured at each of the 100 beam position monitors. Lattice errors are extracted from the measurements. Corrections are then applied. The emittance of all of the bunches in the train is measured and the effectiveness of the correction procedure demonstrated.
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MOPWI031	Microwave Modeling for Electron Cloud Density Measurements at CesrTA	simulation, resonance, electron, synchrotron	1227
	J.P. Sikora, Y. Li Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA S. De Santis LBNL, Berkeley, California, USA
	Funding: This work is supported by the US National Science Foundation PHY-0734867, PHY-1002467, and the US Department of Energy DE-FC02-08ER41538, DE-SC0006505. The electron cloud (EC) density in accelerator beam-pipe has been measured using resonant microwaves. The resonances are produced by changes in beam-pipe geometry that generate reflections and standing waves, with typical behavior being similar to a section of waveguide with shorted ends. The technique uses fact that the EC density will shift the resonant frequencies. In previous analysis, we have made the simplifying approximation that the standing waves are multiples of a half-wavelength and that the magnitude of the electric field is symmetric about the longitudinal center of the resonance. In this paper we show that some changes in beam-pipe geometry will result in asymmetric electric field magnitudes along the resonant length. When this is combined with an EC density that varies along this length, the magnitude of the frequency shift will be altered. We present our initial attempt to correct for this effect by modeling the existing beam-pipe using CST Microwave Studio(R) to obtain a more realistic electric field distribution. This correction is then applied to data taken with beam at several resonant frequencies. The measurements were made at the Cornell Electron Storage Ring (CESR), which has been reconfigured as a test accelerator (CesrTA) providing electron or positron beams ranging in energy from 2 to 5 GeV. * http://dx.doi.org/10.1016/j.nima.2014.03.063
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TUXC2	Engineering Challenges of Future Light Sources	vacuum, feedback, emittance, synchrotron	1308
	R.T. Neuenschwander, L. Liu, S.R. Marques, A.R.D. Rodrigues, R.M. Seraphim LNLS, Campinas, Brazil
	We review some of the present engineering challenges associated with the design and construction of ultra-low emittance storage rings, the 4th generation storage rings (4GSR). The field is experiencing a growing interest since MAX-IV, followed by Sirius, started to build storage rings based on multi-bend-achromat (MBA) lattices. It was the recent progress in accelerator technology that allowed these facilities to base their designs on this kind of lattice. Although the challenges are starting to be overcome, many issues are still open and a lot of R&D is required until the 4GSR achieve optimal performance.
	Slides TUXC2 [7.022 MB]
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TUXC3	Commissioning of the Taiwan Photon Source	booster, quadrupole, emittance, synchrotron	1314
	C.-C. Kuo, C.-T. Chen, J.Y. Chen, M.-S. Chiu, P.J. Chou, K.T. Hsu, Y.C. Liu, G.-H. Luo, H.-J. Tsai, F.H. Tseng NSRRC, Hsinchu, Taiwan
	The Taiwan Photon Source (TPS) is a 3-GeV third-generation synchrotron light source located in Hsinchu, Taiwan. After ground breaking on February 7, 2010 and five years of construction and hardware developments, commissioning of the beam began on December 12, 2014. The booster ring reached the design energy of 3 GeV on December 16. Beam transferred to the storage ring and first accumulation at 3 GeV produced the first synchrotron light on December 31. This report presents results and experience of the TPS commissioning.
	Slides TUXC3 [5.425 MB]
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TUAB2	First Collective Effects Measurements in NSLS-II with ID's	impedance, lattice, vacuum, quadrupole	1332
	A. Blednykh, B. Bacha, G. Bassi, W.X. Cheng, J. Choi, Y. Hidaka, Y. Li, B. Podobedov, T.V. Shaftan, V. Smalyuk, T. Tanabe, G.M. Wang, F.J. Willeke, L.-H. Yu BNL, Upton, Long Island, New York, USA
	Funding: Work supported by DOE contract DE-AC02-98CH10886. As another important milestone towards the final goal to store an average current of 500mA, the average current of 200mA, distributed within ~1000 bunches, was recently achieved in the NSLS-II storage ring after the installation of three Damping Wigglers and four In-Vacuum Undulators. First measurements of the collective effects and instability thresholds, both in single- and multi-bunch mode, are discussed.
	Slides TUAB2 [2.691 MB]
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TUPWA001	Measurement of the Incoherent Depth of Field Effect on Horizontal Beam Size Using a Synchrotron Light Interferometer	electron, photon, synchrotron, lattice	1391
	M.J. Boland SLSA, Clayton, Australia W.J. Corbett SLAC, Menlo Park, California, USA T.M. Mitsuhashi KEK, Ibaraki, Japan
	The electron beam size as measured using synchrotron light in a circular accelerator is influenced by the incoherent depth of field effect. This effect comes about due to the instantaneous opening angle of the emitted synchrotron radiation (SR) and the acceptance angle of the SR light monitor beamline. Measurements were made using a visible light interferometer at the visible light beamlines in three circular accelerators at ATF, SPEAR3 and AS. The first order spatial coherence of the beam was measured and from that the horizontal beam size was calculated. The data is compared with a theory of synchrotron radiation with and without the horizontal incoherent field depth effect.
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TUPWA002	Layout Options for the AXXS Injector and XFEL	linac, FEL, lattice, dipole	1394
	M.J. Boland, Y.E. Tan, D. Zhu SLSA, Clayton, Australia
	A new injector is being planned for the Australian Synchrotron that is designed to feed both an upgraded storage ring and an XFEL. The desire to fit the AXXS project on the same site as the existing light source presents several layout difficulties. Several options are studied and simulations are performed to check the impact each choice has on the beam performance.
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TUPWA004	Operator Roles at the Australian Synchrotron	operation, synchrotron, controls, database	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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TUPWA006	SIRIUS ACCELERATORS STATUS REPORT	booster, vacuum, dipole, quadrupole	1403
	A.R.D. Rodrigues, F.C. Arroyo, O.R. Bagnato, J.F. Citadini, R.H.A. Farias, J.G.R.S. Franco, L. Liu, S.R. Marques, R.T. Neuenschwander, C. Rodrigues, R.M. Seraphim, O.H.V. Silva LNLS, Campinas, Brazil
	Sirius is a 3 GeV synchrotron light source that is being built by the Brazilian Synchrotron Light Laboratory (LNLS). The electron storage ring is based on a modified 5BA cell to achieve a bare lattice emittance of 0.27 nm.rad in a 518 m circumference ring that contains 20 straight sections of alternating 6 and 7 meters in length. The 5BA cell accommodates a thin permanent magnet high field (2 T) dipole in the center of the middle bend producing hard X-ray radiation (εc=12 keV) with a modest contribution to the total energy loss. In this paper we discuss the main achievements and issues for Sirius accelerators. Developments in beamlines are not discussed here.
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TUPWA012	SOLEIL Status Report	undulator, operation, photon, vacuum	1419
	A. Nadji, Y.-M. Abiven, F. Bouvet, P. Brunelle, A. Buteau, N. Béchu, L. Cassinari, M.-E. Couprie, X. Delétoille, C. Herbeaux, N. Hubert, N. Jobert, M. Labat, J.-F. Lamarre, P. Lebasque, A. Lestrade, A. Loulergue, P. Marchand, O. Marcouillé, J.L. Marlats, L.S. Nadolski, R. Nagaoka, P. Prigent, K.T. Tavakoli, M.-A. Tordeux, M. Valléau SOLEIL, Gif-sur-Yvette, France
	The 2.75 GeV synchrotron light source SOLEIL (France) delivers photons to 27 beamlines and 2 new ones are under construction. The commissioning of the Femtoslicing operation mode involving two beamlines is in progress. The uniform filling pattern is now available to users with a 500 mA stored beam current. The operation of the two canted and long beamlines ANATOMIX and Nanoscopium both using in-vacuum insertion devices (IDs) as a photon source has been raising challenges still under investigation. Upgrades of crucial subsystem equipment like magnet power supplies, storage ring RF input power couplers, and solid state amplifiers are continuing. New user requests for beam stability are under upgrade consideration. Other projects for the storage ring are ongoing such as the design and construction of new insertion devices, new multipole injection kicker, localised small and round photon beam production, as well as R&D on 500 MHz solid-state amplifiers. In parallel first studies for a future upgrade of the machine have been progressing.
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TUPWA021	A New Method to Generate Ultrashort and Coherent Pulses of Short-Wavelength Synchrotron Radiation	laser, electron, radiation, synchrotron	1448
	S. Khan DELTA, Dortmund, Germany
	Funding: Work supported by the BMBF (contract 05K13PE3) A laser-based method to generate ultrashort pulses of synchrotron radiation in electron storage rings is coherent harmonic generation (CHG) using two undulators to produce coherent radiation at harmonics of the initial laser wavelength by microbunching. The bunching factor and thus the pulse intensity, however, decreases exponentially with increasing harmonic order. Echo-enabled harmonic generation (EEHG), proposed in 2009 as FEL seeding scheme, can be used to produce short synchrotron radiation pulses at higher harmonics, but requires three undulators in a straight section. In this paper, a less space-consuming method based on seeding with intensity-modulated laser pulses is introduced, which also has the potential of significant bunching factors at high harmonics. G. Stupakov, PRL 102 (2009), 074801.
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TUPWA025	Beam Heat Load Analysis with COLDDIAG: A Cold Vacuum Chamber for Diagnostics	electron, diagnostics, vacuum, synchrotron	1459
	R. Voutta, S. Casalbuoni, S. Gerstl, A.W. Grau, T. Holubek, D. Saez de Jauregui KIT, Eggenstein-Leopoldshafen, Germany R. Bartolini, M.P. Cox, E.C. Longhi, G. Rehm, J.C. Schouten, R.P. Walker DLS, Oxfordshire, United Kingdom M. Migliorati, B. Spataro INFN/LNF, Frascati (Roma), Italy
	The knowledge of the heat intake from the electron beam is essential to design the cryogenic layout of superconducting insertion devices. With the aim of measuring the beam heat load to a cold bore and understanding the responsible mechanisms, a cold vacuum chamber for diagnostics (COLDDIAG) has been built. The instrumentation comprises temperature sensors, pressure gauges, mass spectrometers and retarding field analyzers, which allow to study the beam heat load and the influence of the cryosorbed gas layer. COLDDIAG was installed in the storage ring of the Diamond Light Source from September 2012 to August 2013. During this time measurements were performed for a wide range of machine conditions, employing the various measuring capabilities of the device. Here we report on the analysis of the measured beam heat load, pressure and gas content, as well as the low energy charged particle flux and spectrum as a function of the electron beam parameters.
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TUPWA036	Possibility of Longitudinal Bunch Compression in Petra III	emittance, optics, FEL, undulator	1492
	I.V. Agapov XFEL. EU, Hamburg, Germany S.I. Tomin NRC, Moscow, Russia R. Wanzenberg DESY, Hamburg, Germany
	A scheme of short bunch production in storage rings using a longitudinally focusing insertion was presented in . In this work we study the possibility of integrating such insertion into the PetraIII storage ring. In particular, we discuss possible optics solutions to integrate RF stations, chicane-type delay sections, and the undulators into existing ring geometry. I. Agapov and G. Geloni, proc. FEL 2014.
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TUPWA043	Non-interferometric Spectral Analysis of Synchrotron Radiation in the THz regime at ANKA	synchrotron, radiation, synchrotron-radiation, electron	1509
	J.L. Steinmann, M. Brosi, E. Bründermann, C.M. Caselle, E. Hertle, N. Hiller, B. Kehrer, A.-S. Müller, M. Schuh, M. Schwarz, P. Schönfeldt, P. Schütze KIT, Karlsruhe, Germany J.L. Hesler Virginia Diodes Inc., Charlottesville, USA
	Interferometry is the quasi-standard for spectral measurements in the THz- and IR-range. The frequency resolution, however, is limited by the travel range of the interferometer mirrors. Therefore, a resolution in the low megahertz range would require interferometer arms of about 100 m. As an alternative, heterodyne measurements provide a resolution in the Hertz range, an improvement of 6 orders of magnitude. Here we present measurements done at ANKA with a VDI WR3.4SAX, a mixer that can be tuned to frequencies from 220 GHz to 330 GHz and we show how the bunch filling pattern influences the amplitude of specific frequencies.
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TUPWA064	Study of Inherent Potential for Emittance Reduction at the SPring-8 Storage Ring	optics, brilliance, emittance, photon	1573
	Y. Shimosaki JASRI/SPring-8, Hyogo-ken, Japan
	A design study for an upgrade project of the SPring-8, the SPring-8-II, is in progress, which is a full-scale major lattice modification. Besides the design study for the SPring-8-II, an inherent potential of achieving much higher brilliance than that of the present SPring-8 has been explored for the general evaluation. In this paper, the evaluation of the inherent potential for the SPring-8, not for the SPring-8-II, in terms of increasing the brilliance is discussed.
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TUPJE004	Narrow Band Coherent Edge Radiation at UVSOR-III	radiation, electron, experiment, laser	1613
	M. Hosaka, O. Oodake, Y. Takashima, N. Yamamoto Nagoya University, Nagoya, Japan S. Bielawski, C. Szwaj PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France M. Katoh, T. Konomi, J. Yamazaki UVSOR, Okazaki, Japan H. Zen Kyoto University, Kyoto, Japan
	Edge radiation can be an interesting new light source because of its property that the radiation is well collimated and is radially polarized. We are developing coherent light sources in the THz region at UVSOR-III storage ring. We have already succeeded in producing a narrow band coherent THz radiation by manipulating the interaction of a relativistic electron bunch with an amplitude modulated laser with. Recently a simplified tentative beamline for detection of the edge radiation is installed at downstream of a short straight section of UVSOR-III. Coherent radiation from electron bunches after the interaction with the amplitude modulated laser is observed. Detailed measurements of polarizations and special distribution of the radiation are underway. The latest status of the study will be reported.
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TUPJE005	Development of Pulsed Multipole Magnet for Aichi SR Storage Ring	electron, injection, multipole, synchrotron	1616
	K. Ito, M. Hosaka, A. Mano, T. Takano, Y. Takashima Nagoya University, Nagoya, Japan K. Hayashi, M. Katoh UVSOR, Okazaki, Japan N. Yamamoto KEK, Ibaraki, Japan
	The Aichi synchrotron radiation (Aichi SR) center is an industrial oriented synchrotron light source facility. The electron energy and circumference of the storage ring are 1.2 GeV and 72 m. The natural emittance is 53 nm-rad. Since the pulsed multipole injection scheme provides great advantages for relatively smaller SR rings, we are developing a pulsed multipole injection system for Aichi SR storage ring. In this system, it is essential to minimize the perturbation to the stored beam. To realize the required performances, we have to minimize the residual field at stored beam position, taken into account the field generated by the copper current lead of the input terminal. In addition, we carried out the analytical calculation to estimate the magnet field due to the current lead and optimized the geometrical structure of them. Construction of the multipole magnet will be completed in March 2015 and the field measurement will be carried out in April. In this presentation, we report the detail of the magnet design and the measurement results of pulsed magnetic field for the manufactured magnet. N. Yamamoto, et. al., NIM A 767, 26-33 (2014)
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TUPJE015	Beta Function Matching and Tune Compensation for HLS-II Insertion Devices	insertion, insertion-device, undulator, electron	1647
	B. Li, J.Y. Li, W. Xu, K. Xuan USTC/NSRL, Hefei, Anhui, People's Republic of China
	In order to increase its brightness and improve the performance, the Hefei Light Source (HLS) was completely renovated from 2010 to the end of 2014. The magnet lattice of the new storage ring consists of four double bend achromatic (DBA) cells. There are eight straight sections which can be used to install up to 6 insertion devices (IDs). Currently, five insertion devices have been installed in the storage ring. It is known that the dynamics of the electron beam motion in the storage ring would be influenced by the insertion device, depending on its physical properties. In order to keep high performance operation of the storage ring and make the insertion device transparent to the rest of the storage ring, a complex compensation scheme is developed to match the beta functions at both ends of a ID and perform transverse tune compensation. This scheme has been integrated into the EPICS based control system of the HLS-II. The result indicates that the scheme is very effective to compensate the impact of the insertion devices.
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TUPJE018	On-axis Injection Scheme for Ultimate Storage Ring with Double RF Systems	injection, synchrotron, emittance, radiation	1657
	B.C. Jiang, S.Q. Tian, M.Z. Zhang, Q.L. Zhang, Z.T. Zhentang SINAP, Shanghai, People's Republic of China
	An on-axis injection scheme using double RF systems for an ultimate storage ring which holds very small dynamic aperture is proposed. By altering RF voltages, empty RF buckets can be created which will be used for on-axis injection. After bunches are injected, a reverse voltage altering process is performed and the injected bunches can be longitudinally dumped to the main buckets.
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TUPJE023	Consideration on the Future Major Upgrades of the SSRF Storage Ring	injection, cavity, emittance, optics	1672
	Z.T. Zhao, B.C. Jiang, Y.B. Leng, S.Q. Tian, L. Yin, M.Z. Zhang SINAP, Shanghai, People's Republic of China
	The SSRF storage ring was in operation from 2008, currently it is operating at the energy of 3.5GeV, the natural emittance of 3.9 nm-rad and the beam current of 240 mA, serving for 13 beamlines with 9 IDs. There will be around 40 operated beamlines around 2020, which need some upgrade of the storage ring existing performance, such as the new lattice with superbends. And looking for the future beyond, the major upgrade towards a diffraction limited storage ring is under consideration. This paper presents the initial investigation and the proposal on the ultimate storage ring upgrade for SSRF.
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TUPJE034	A Preliminary Report from Louisiana State University CAMD Storage Ring Operating with an 11-pole 7.5 T Wiggler	wiggler, operation, electron, injection	1682
	R.S. Amin, P. Jines, D.J. Launey, K.J. Morris, V.P. Suller, Y. Wang LSU/CAMD, Baton Rouge, Louisiana, USA V.K. Lev, N.A. Mezentsev, V.A. Shkaruba, V.M. Syrovatin, O.A. Tarasenko, V.M. Tsukanov, A.A. Volkov, A.V. Zorin BINP SB RAS, Novosibirsk, Russia
	Funding: Funded by the National Science Foundation. Louisiana State University installed a 7.5 T superconducting wiggler in May 2013 on the electron storage ring located at the Bennett Johnson, Sr. Center for Advanced Microstructures and Devices (CAMD). The wiggler’s influence on betatron tunes and functions, orbit, lifetime, performance, and other relevant beam parameters are described. We further comment on device operations and modifications to ring operations that were necessary to provide light for both wiggler and dipole stations.
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TUPJE035	Optimization of Turn-by-Turn Measurements at Soleil and Alba Light Sources	quadrupole, lattice, betatron, synchrotron	1686
	M. Carlà, G. Benedetti, Z. Martí ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain L.S. Nadolski SOLEIL, Gif-sur-Yvette, France
	Turn-by-turn measurements paves the way for fast storage ring diagnostics. On the other hand turn-by-turn technique is by its very nature delicate, requiring an extensive system tuning and understanding. During last year several attempts to recover linear model informations from turn-by-turn measurements has been carried out in cooperation between the synchrotrons of SOLEIL and ALBA. A routine to extract phase advance and betatron amplitude from turn-by-turn measurements in presence of damping has been developed. Moreover a procedure to retrieve quadrupole errors from such observables has been developed tested and verified against the traditional diagnostics tools based on closed orbit measurements. A comparison between the different methods and the performance of the two different experimental setups are reported.
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TUPJE038	Impact of Insertion Devices on the MAX IV Storage Rings	lattice, optics, quadrupole, octupole	1696
	S.C. Leemann, H. Tarawneh MAX-lab, Lund, Sweden
	There will be multiple compensations employed for insertion devices in the MAX IV storage rings. Apart from well-known dipole corrections and previously detailed local and global linear optics matching, certain insertion devices in the MAX IV storage rings will also require nonlinear optics adjustments and/or skew quadrupole corrections. The goal of such corrections is ensuring sufficient dynamic aperture as well as low residual emittance coupling. This paper will present a few studies that rely on tracking through kick maps in order to quantify detrimental effects of insertion devices on dynamic aperture and vertical emittance, develop suitable countermeasures, and finally, verify restored storage ring performance.
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TUPJE042	Transverse Tunes Determination from Mixed BPM Data	betatron, operation, injection, coupling	1709
	P. Zisopoulos, F. Antoniou, Y. Papaphilippou CERN, Geneva, Switzerland E. Hertle, A.-S. Müller KIT, Eggenstein-Leopoldshafen, Germany
	Decoherence due to non-zero chromaticity and/or amplitude dependent tune-shift, but also damping mechanisms can affect the accurate tune determination by leaving a limited number of turns for frequency analysis of the turn by turn (TbT) position data. In order to by-pass these problems, Fourier analysis of mixed TBT data from all BPMs can be employed. The approach is applied in two different accelerators, a hadron collider as the LHC and a synchrotron light source as the ANKA storage ring. The impact in the accuracy of the method of missing BPM data is also discussed.
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TUPJE044	Local Orbit Response Matrix Measurement at SLS	quadrupole, optics, focusing, feedback	1713
	M. Aiba, M. Böge PSI, Villigen PSI, Switzerland
	The experimental determination of linear optics is essential to achieve a high performance ring accelerator. One of the methods, linear optics from closed orbits (LOCO), is widely employed to correct linear optics. Due to the ring nature, a quadrupole error at a location of the ring affects the entire orbit response measurement data. The orbit response, however, can be localised to a certain range of the ring when an orbit feedback (or correction) is applied to the rest of the ring. The quadrupole errors located in the range, where the feedback is acting, then have no impact, and the ring optics can be locally examined. An application of this technique to Swiss light source is discussed.
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TUPJE047	Design Studies for an Upgrade of the SLS Storage Ring	emittance, lattice, radiation, operation	1724
	A. Streun, M. Aiba, M. Böge, M.P. Ehrlichman, A. Saá Hernández PSI, Villigen PSI, Switzerland
	An upgrade of the Swiss Light Source (SLS) would replace the existing storage ring by a low aperture multibend achromat lattice providing an emittance of about 100–200 pm at 2.4 GeV, while maintaining the hall, the beam lines and the injector. Since emittance scales inversely cubically with the number of lattice cells, an SLS upgrade is challenged by the comparatively small ring circumference of only 288 m. A new concept for a compact low emittance lattice is based on longitudinal gradient bending magnets for emittance minimization and on anti-bends (i.e bends of opposite field polarity) to disentangle dispersion and horizontal beta function in order to provide the optimum matching to the longitudinal gradient bends while minimizing the contribution to chromaticity.
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TUPJE048	Orbit Correction and Stability Studies for Ultra-Low Emittance Storage Rings	photon, emittance, simulation, dipole	1728
	M. Böge, M. Aiba, A. Streun PSI, Villigen PSI, Switzerland
	Ultra-low emittance storage rings exhibit extremely strong focusing and sextupolar chromaticity corrections. The therefore mandatory excellent centering of the closed orbit in the small aperture magnets is a challenging task and necessitates a proper beam diagnostics and correction layout. Correction and stability studies for a possible ultra-low emittance upgrade of the Swiss Light Source are presented.
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TUPJE061	Injection Studies for the Diamond Storage Ring	septum, injection, kicker, lattice	1768
	I.P.S. Martin, M. Apollonio, R. Bartolini DLS, Oxfordshire, United Kingdom R. Bartolini JAI, Oxford, United Kingdom
	The Diamond storage ring will be upgraded during 2016 by replacing one of the existing double bend achromat (DBA) cells with a double-DBA (DDBA) cell. It is anticipated that both the on and off momentum dynamic aperture will reduce as a result of this change. In order to prepare for this eventuality, injection into the Diamond storage ring has been recently studied in detail. In particular, the oscillation amplitude, angle and energy of the injected beam have been determined, along with the position of the stored beam with respect to the septum plate. Following these studies, the injected beam energy has been matched to the storage ring, and plans have been put in place to move the injection septum 4 mm closer to the stored beam centre line. R.P. Walker et al., “The Double-Double Bend Achromat (DDBA) Lattice Modification for the Diamond Storage Ring”, Proc. IPAC 2014, MOPRO103, (2014)
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TUPJE062	First Transparent Realignment Tests at the Diamond Storage Ring	controls, alignment, survey, 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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TUPJE068	Development and Performance of 1.1-m Long Superconducting Undulator at the Advanced Photon Source	undulator, photon, dipole, operation	1794
	Y. Ivanyushenkov, C.L. Doose, J.F. Fuerst, E. Gluskin, K.C. Harkay, Q.B. Hasse, M. Kasa, Y. Shiroyanagi, D. Skiadopoulos, E. Trakhtenberg ANL, Argonne, Ilinois, USA
	Funding: Work supported by U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. Development of superconducting undulators continues at the Advanced Photon Source (APS). The second superconducting undulator, SCU1, has been built and installed in the storage ring of the APS. This undulator has a 1.1-m long superconducting magnet and utilizes an improved version of the cryostat of the first superconducting undulator, SCU0. The results of the cold test of the SCU1, and its performance in the APS storage ring are presented in this paper.
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TUPJE075	Simulation Study of Injection Performance for the Advanced Photon Source Upgrade	injection, simulation, emittance, kicker	1816
	A. Xiao, V. Sajaev 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 A vertical on-axis injection scheme has been proposed for the hybrid seven-bend-achromat (H7BA) Advanced Photon Source upgrade (APSU) lattice. In order to evaluate the injection performance, various errors, such as injection beam jitter, optical mismatch and errors, and injection element errors have been investigated and their significance has been discovered. Injection efficiency is then simulated under different error levels. Based on these simulation results, specifications and an error-budget for individual systems have been defined.
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TUPJE084	Development of Nonlinear Injection Kicker Magnet for ALS Accelerator	injection, kicker, power-supply, operation	1837
	G.C. Pappas, D.J. Baum, J.-Y. Jung, D. Robin, C. Steier, C. Sun, C.A. Swenson LBNL, Berkeley, California, USA
	Funding: This work was supported by Lawrence Berkeley National Laboratory under U.S. Department of Energy Contract No. DE-AC02-05CH11231. The ALS in now engaged in the construction of a new hard x-ray beam line and insertion device for protein crystallography. The scope of work entails the reconfiguration of ALS Sectors 1-3 to make room for the new insertion device. The project will require the melioration of the ALS injection system as well as the development of a longitudinal RF kicker. A key aspect of the injector work is the development and integration of a nonlinear injection kicker (NLK) magnet system to facilitate top off injection without noticeable motion of the beam. The technology will, in principal, ultimately allow the removal of the conventional bump injection magnets presently located in ALS Sector 1. The nonlinear injection concept has been explored at several other light sources . We examine the beam dynamics and magnet design requirements to adapt this technology to the ALS lattice with its 1.9 GeV beam. The work will review the injection beam matching, tracking simulations, the electromagnetic design and tolerance analysis, power supply design. The paper will also review the project plan for the integration of this technology into the ALS. T. Atkinson et al., "Development of a Non-Linear Kicker System to Facilitate a New Scheme for the BESSY-II Storage Ring", Proc. of IPAC 2011, THPH024.
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TUPMA012	Developing an Improved Pulsed Mode Operation for Duke Storage Ring Based FEL	FEL, operation, wiggler, damping	1860
	S.F. Mikhailov, H. Hao, V. Popov, Y.K. Wu FEL/Duke University, Durham, North Carolina, USA
	Funding: This work is supported in part by the US DoE grant # DE-FG02-97ER41033 The Duke FEL and High Intensity Gamma-ray Source (HIGS) facility is operated with an e-beam from 0.24 to 1.2 GeV and a photon beam from 190 to 1060 nm. Currently, the energy range of the gamma-ray beam is from 1 MeV to about 100 MeV, with the maximum total gamma-ray flux about 3·10¹⁰ gammas per second around 10 MeV. The FEL is typically operated in quasi-CW mode. Some HIGS user experiments can benefit tremendously from a pulsed mode of FEL operation. For that purpose, a fast steering magnet was developed years ago to modulate the FEL gain. This FEL gain modulator decouples the e-beam from the FEL beam in the interaction region for most of time, but periodically allows a brief overlap of the electron and FEL beams. This allows us to build up a high peak power FEL pulse from a well-damped electron beam. However, the use of this gain modulator at low e-beam energies can dramatically limit e-beam current due to beam instability and poor injection. To overcome these shortcomings, we have successfully tested an RF frequency modulation technique to pulse the FEL beam. In this paper, we will describe this development, and report our preliminary results of this improved pulsed FEL operation.
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TUPMA016	Light Source and Accelerator Physics Research Program at Duke University	FEL, wiggler, operation, electron	1866
	Y.K. Wu FEL/Duke University, Durham, North Carolina, USA
	Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033. The light source and accelerator physics research program at Duke Free-Electron Laser Laboratory (DFELL), TUNL, is focused on the development of the storage ring based free-electron lasers (FELs), and a state-of-the-art Compton gamma-ray source, the High Intensity Gamma-ray Source (HIGS) which is driven by the storage ring FEL. With a maximum total flux about 3·10¹⁰ gamma/s and a spectral flux of more than 1,000 gamma/s/eV around 10 MeV, the HIGS is the world's most intense Compton gamma-ray source. Operated in the energy range from 1 to 100 MeV, the HIGS is a premier Compton gamma-ray facility in the world for a variety of nuclear physics research programs, both fundamental and applied. In this paper, we will describe our ongoing light source development to produce gamma-ray beams in the higher energy range of 100 and 158 MeV. We will also provide a summary of our recent accelerator physics and FEL physics research activities.
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TUPMA022	CESR Upgrade as a High-Energy, High-Brightness X-Ray Light Source	emittance, positron, electron, lattice	1884
	J.P. Shanks, D. L. Rubin Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	Funding: Research supported by NSF grant DMR-1332208. The Cornell Electron Storage Ring (CESR) operates most of the year as the Cornell High Energy Synchrotron Source (CHESS). CESR was originally designed and operated as an electron/positron collider, circulating high-emittance beams in order to maximize luminosity. Beam lines were developed to extract x-rays from both electron and positron beams. The two beams share a common vacuum chamber, and are electrostatically separated to avoid collisions. The requirement to store counter-rotating beams significantly constrains the storage ring optics, limiting emittance and, beam current, and bunch distributions. The proposed upgrade eliminates two-beam operation in favor of a single optimized on-axis beam. Several new undulator-based beam lines are planned. The horizontal emittance is reduced in steps, first from 90nm to 20nm at 5.3 GeV, and then in a ring-wide upgrade to as low as 300 pm-rad at 6GeV. The low-emittance optics are based on multi-bend achromats with combined function bends. The details of the optics, apertures, and magnet parameters are presented.
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TUPMA050	NSLS-II Injector Commissioning and Initial Operation	booster, linac, operation, injection	1944
	E.B. Blum, B. Bacha, G. Bassi, J. Bengtsson, A. Blednykh, S. Buda, W.X. Cheng, J. Choi, J. Cupolo, R. D'Alsace, M.A. Davidsaver, J.H. De Long, L. Doom, D.J. Durfee, R.P. Fliller, M. Fulkerson, G. Ganetis, F. Gao, C. Gardner, W. Guo, R. Heese, Y. Hidaka, Y. Hu, M.P. Johanson, B.N. Kosciuk, S. Kowalski, S.L. Kramer, S. Krinsky, Y. Li, W. Louie, M.A. Maggipinto, P. Marino, J. Mead, J. Oliva, D. Padrazo, K. Pedersen, B. Podobedov, R.S. Rainer, J. Rose, M. Santana, S. Seletskiy, T.V. Shaftan, O. Singh, P. Singh, V.V. Smaluk, R.M. Smith, T. Summers, J. Tagger, Y. Tian, W.H. Wahl, G.M. Wang, G.J. Weiner, F.J. Willeke, L. Yang, X. Yang, E. Zeitler, E. Zitvogel, P. Zuhoski BNL, Upton, Long Island, New York, USA A. Akimov, P.B. Cheblakov, I.N. Churkin, A.A. Derbenev, S.M. Gurov, S.E. Karnaev, V.A. Kiselev, A.A. Korepanov, E.B. Levichev, S.V. Sinyatkin, A.N. Zhuravlev BINP SB RAS, Novosibirsk, Russia
	The injector for the National Synchrotron Light Source II storage ring consists of a 3 GeV booster synchrotron and a 200 MeV S-band linac. The linac was designed to produce either a single bunch with a charge of 0.5 nC of electrons or a train of bunches up to 300 ns long containing a total charge of 15 nC. The booster was designed to accelerate up to 15 nC each cycle. Linac commissioning was completed in April 2012. Booster commissioning was started in November 2013 and completed in March 2014. All of the significant design goals were satisfied including beam emittance, energy spread, and transport efficiency. While the maximum booster charge accelerated was only 10 nC this has proven to be more than sufficient for storage ring commissioning. The injector has operated reliably during storage ring operation since then. Results will be presented showing measurements of injector operating parameters achieved during commissioning and initial operation. Operating experience and reliability during the first year of NSLS-II operation will be discussed.
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TUPMA052	NSLS-II Radio Frequency Systems	cavity, feedback, operation, booster	1947
	J. Rose, F. Gao, B. Holub, J.G. Kulpin, C. Marques BNL, Upton, Long Island, New York, USA A. Goel ANL, Argonne, Ilinois, USA M. Yeddulla Varian Medical Systems, Inc., Palo Alto, California, USA
	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. The NSLS-II RF system consists of the master oscillator, digital low level RF controllers, linac, booster and storage ring RF sub-systems, as well as a supporting cryogenic system. Here we will report on RF commissioning and early operation experience of the system.
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TUPMA053	Experience with First Turns Commissioning in NSLS-II Storage Ring	injection, kicker, betatron, lattice	1950
	S. Seletskiy, G. Bassi, J. Bengtsson, A. Blednykh, E.B. Blum, W.X. Cheng, J. Choi, R.P. Fliller, W. Guo, R. Heese, Y. Hidaka, S.L. Kramer, Y. Li, B. Podobedov, T.V. Shaftan, G.M. Wang, F.J. Willeke, L. Yang, X. Yang BNL, Upton, Long Island, New York, USA
	In this paper we describe our experience with commissioning of the first turns in the NSLS-II storage ring. We discuss the problems that we encountered and show how applying a dedicated first turns commissioning software allowed us to diagnose and resolve these problems.
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TUPMA054	High Level Application for First Turns Commissioning in NSLS-II Storage Ring	software, GUI, lattice, controls	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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TUPMA055	Analysis of Possible Beam Losses in the NSLS II Storage Ring	radiation, dipole, shielding, electron	1956
	S. Seletskiy, R.P. Fliller, W. Guo, S.L. Kramer, Y. Li, B. Podobedov, T.V. Shaftan, W.H. Wahl, F.J. Willeke BNL, Upton, Long Island, New York, USA
	The NSLS-II accelerators are installed within radiation shielding walls that are designed to attenuate the radiation generated from an assumed beam loss power to a level of <0.5mrem/h at the outer surface of the bulk shield walls. Any operational losses greater than specified level are expected to be addressed by installing supplemental shielding near the loss point in order to attenuate the radiation outside the shield wall to the design level. In this paper we report the analysis of the electron beam mis-steering in the NSLS-II storage ring for the determination of supplementary shielding.
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TUPMA056	Analysis of Possible Beam Losses in the NSLS II BSR Transfer Line	booster, radiation, shielding, extraction	1959
	S. Seletskiy, R.P. Fliller, W. Guo, S.L. Kramer, Y. Li, B. Podobedov, T.V. Shaftan, W.H. Wahl, F.J. Willeke BNL, Upton, Long Island, New York, USA
	The NSLS-II accelerators are installed within 0.8 – 1 m thick radiation shielding walls. The safety considerations require attenuating the radiation generated from possible electron beam losses to a level of <0.5mrem/h at the outer surface of the bulk shield walls. Any operational losses greater than specified level shall be addressed by installing supplemental shielding near the loss point. In this paper we discuss simulation studies that identified potential beam loss locations. Results of these studies were used for identification of imposed radiation risks and for specification of the supplemental shielding design necessary to mitigate those risks.
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TUPMA057	Commissioning of Active Interlock System for NSLS II Storage Ring	synchrotron, radiation, synchrotron-radiation, photon	1962
	S. Seletskiy, C. Amundsen, J. Choi, J.H. De Long, K.M. Ha, C. Hetzel, H.-C. Hseuh, Y. Hu, P. Ilinski, S.L. Kramer, Y. Li, M.A. Maggipinto, J. Mead, D. Padrazo, T.V. Shaftan, G. Shen, O. Singh, R.M. Smith, W.H. Wahl, G.M. Wang, F.J. Willeke, L. Yang BNL, Upton, Long Island, New York, USA
	The NSLS-II storage ring is protected from possible damage from insertion devices (IDs) synchrotron radiation by a dedicated active interlock system (AIS). It monitors electron beam position and angle and triggers beam drop if beam orbit exceeds the boundaries of pre-calculated active interlock envelope. In this paper we describe functional details of the AIS and discuss our experience with commissioning of the AIS for the first six IDs installed in the storage ring.
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Paper

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MOAD3

Relative Alignment Within the MAX IV 3 GeV Storage Ring Magnet Blocks

alignment, synchrotron, magnet-design, quadrupole

57

J.H. Björklund Svensson, M.A.G. Johansson
MAX-lab, Lund, Sweden

Unlike the discrete magnet scheme of previous 3rd generation light sources, the magnet elements of the MAX IV storage rings are integrated in precision-machined magnet blocks. By analyzing the rotating coil measurements made by the magnet suppliers, we determined the relative alignment between consecutive magnet elements, which was found to be <10 microns RMS for all magnet block types in both horizontal and vertical direction. This article presents our analysis and results for the full magnet production series.

Slides MOAD3 [1.825 MB]

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MOPWA015

Lattice Correction using LOCO for the ThomX Storage Ring

quadrupole, optics, lattice, coupling

117

I. Chaikovska, C. Bruni, S. Chancé, A. Variola, J.F. Zhang
LAL, Orsay, France
A. Loulergue
SOLEIL, Gif-sur-Yvette, France

Funding: Work is supported by the French Agence Nationale de la Recherche as part of the program EQUIPEX under reference ANR-10-EQPX-51, the Ile de France region, CNRS-IN2P3 and Université Paris Sud XI
ThomX is a compact Compton based X-ray source under construction at LAL in Orsay (France). The ThomX accelerator facility is composed by a 50-70 MeV linac driven by 3 GHz RF gun, a transfer line and a 18 meters long Storage Ring (SR). The Compton backscattering at each revolution between the 1 nC electron bunch and the 25 mJ laser pulses stacked in the Fabry-Perot cavity results in the production of ~10¹³ photons per second with energies in the X-ray regime. This high flux of the X-rays strongly depends on the quality (beam sizes) of the electron beam at the interaction point. To guarantee this, a good knowledge and quality of the linear lattice of the ThomX SR are required. Nowadays, LOCO (Linear Optics from Closed Orbits) is a well-known and widely used algorithm to measure and restore the linear optics of the SRs and ensure the designed performances. Comparing the measured and model orbit response matrices, the linear lattice can be restored by retuning the quadrupole gradients. In this paper, we report on the LOCO analysis of the ThomX SR taking into account simulated misalignment, calibration and field errors.

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MOPWA032

Aspects of SRF Cavity Optimization for BESSY-VSR Upgrade

cavity, HOM, SRF, higher-order-mode

171

T. Galek, K. Brackebusch, T. Flisgen, J. Heller, U. van Rienen
Rostock University, Faculty of Computer Science and Electrical Engineering, Rostock, Germany
B.D. Isbarn, B. Riemann, M. Sommer, T. Weis
DELTA, Dortmund, Germany

Funding: Work supported by Federal Ministry for Research and Education BMBF under contract 05K13HR1.
In this work we present a preliminary study of a long chain of cavities and some aspects involved in the optimization procedure. It is important to numerically model and optimize the SRF cavities with respect to external quality factors of the most dangerous higher order modes. BESSY-VSR is an upgrade scheme for the existing BESSY II storage ring aiming to simultaneously support variable electron pulse lengths. Currently, BESSY II supports long 15 ps bunches in the standard user optics configuration and short 1.5 ps bunches in a so-called low-α optics mode. In order to develop BESSY II into a variable electron pulse length storage ring, additional two sets of SRF higher-harmonic cavities will be installed. The present RF acceleration system operates at 0.5 GHz and the additional 3rd harmonic and 3rd sub-harmonic cavities will operate at 1.5 GHz and 1.75 GHz, respectively. These cavities are essential to produce short 1.5 ps bunches with a design current of up to 0.8 mA per bunch. The total current in the storage ring is limited by the higher order mode damping capabilities of the SRF cavities.

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MOPWA034

Coupled-Bunch Instability Suppression Using RF Phase Modulation at the DELTA Storage Ring

damping, synchrotron, electron, feedback

179

M. Sommer, M. Höner, B.D. Isbarn, S. Khan, B. Riemann, T. Weis
DELTA, Dortmund, Germany

Funding: Work supported by the BMBF under contract no. 05K13PEB
The upcoming upgrade of BESSY II, called BESSY-VSR*, involves the utilization of superconducting multicell RF-resonators with high accelerating gradients to provide short and long bunches in an electron storage ring simultaneously. Even under the assumption of strongest available damping of beam induced modes, the residual impedances of the cavities may cause collective multibunch instabilities at the frontier of stability available from current bunch-by-bunch feedback systems. At the DELTA electron storage ring, a phase modulation of the driving RF is used to suppress coupled-bunch instabilities and to increase the lifetime. The time dependent frequency variation in the order of the synchrotron frequency gives rise to additional damping of the bunch oscillators by decoherence and Landau damping. The behaviour and the additional damping of the bunch oscillators is investigated by the existing bunch-by-bunch feedback system e.g. the increase of the overall damping might support the capability of feedback systems under extreme operating conditions of BESSY-VSR.
* G. Wüstefeld et al., Proc. of IPAC'11, San Sebastián, THPC014

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MOPWA035

Two General Orbit Theorems for Efficient Measurements of Beam Optics

closed-orbit, optics, dipole, lattice

183

B. Riemann, A. Ferrarotto, P. Hartmann, B.D. Isbarn, S. Koetter, M. Sommer, P. Towalski, T. Weis
DELTA, Dortmund, Germany

Closed-orbit perturbations and oscillating beam solutions in storage rings are closely related. While techniques exist to fit accelerator models to closed-orbit perturbations or to oscillation data, the exploitation of their relation has been limited. In this work, two orbit theorems that allow an efficient computation of optical parameters in storage rings with older hardware are derived for coupled linear beam motion. The monitor theorem is based on an uncoupled case study described by the author in an earlier work and has been generalized as well as simplified in mathematical abstraction to provide a reliable and computationally stable framework for beam optics measurements. It is based on a closed-orbit measurement utilizing 4 dipole correctors (2 for each plane). The corrector theorem allows to obtain parameters of these dipole correctors using two turn-by-turn monitors at almost arbitrary positions in the ring (which do not need to be located in a drift space), so that it is possible to uniquely resolve closed orbits into optical parameters without sophisticated lattice models.

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MOPWA044

Quasi-frozen Spin Method for EDM Deuteron Search

dipole, proton, simulation, lattice

213

Y. Senichev, A. Lehrach, B. Lorentz, R. Maier
FZJ, Jülich, Germany
S.N. Andrianov, A.N. Ivanov
St. Petersburg State University, St. Petersburg, Russia
M. Berz, E. Valetov
MSU, East Lansing, Michigan, USA
S. Chekmenev
RWTH, Aachen, Germany

To search for EDM using proton storage ring with purely electrostatic elements the concept of frozen spin method has been proposed by BNL. This method is based on two facts: in the equation of the spin precession the magnetic field dependence is entirely eliminated and at “magic” energy the spin precession frequency coincides with the precession frequency of the momentum. In case of deuteron the anomalous magnetic moment is negative (G=-0.142), therefore we have to use the electrical and magnetic field simultaneously keeping the frozen spin direction along the momentum as in the pure electrostatic ring. In this article we suggest the concept of the quasi-frozen spin when the spin oscillates around the momentum direction within the half value of the advanced spin phase each time returning back by special optics. Due to the low value of the anomalous magnetic moment of deuteron an effective contribution to the expected EDM effect is reduced only by a few percent.

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MOPJE003

Measuring Duke Storage Ring Lattice Using Tune Based Technique

quadrupole, lattice, electron, wiggler

293

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

Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033.
The Duke electron storage ring is a dedicated driver for oscillator Free-Electron Lasers (FELs). A 34 m long straight section of the storage ring is used to host up to four FEL wigglers in several different configurations. A total of six wigglers, two planar OK-4 wigglers and four helical OK-5 wigglers, are available for FEL research. The storage ring magnetic lattice has to be designed with great flexibility to enable the storage ring operation with different FEL wigglers, at various wiggler settings, and for different electron beam energies. Since 2012, the storage ring has demonstrated all designed characteristics in terms of lattice flexibility and tuning. This work is aimed at gaining better understanding of the real storage ring lattice by performing a series of measurements of the beta-functions along the storage ring. Unlike the LOCO technique, the beta-functions in the quadrupoles are directly measured with good accuracy using a tune meassurement system. We will describe our experimental design and techniques, and measurement procedures. We will also report our preliminary results for the lattice characterization.

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MOPJE009

Lattice Design of the SSRF-U Storage Ring

emittance, lattice, dynamic-aperture, injection

304

S.Q. Tian, B.C. Jiang, M.Z. Zhang, Q.L. Zhang, Z.T. Zhao
SINAP, Shanghai, People's Republic of China

Multi-Bend Achromatic (MBA) cell has been well known to significantly reduce the beam emittance of the synchrotron radiation light sources in the past two decades. With the great development of the high gradient magnets, the small-aperture vacuum chamber and the precise alignment, the ultimate-emittance ring based on MBA lattice became practical in recent years. We present a preliminary lattice design for the upgraded SSRF storage ring based on a 7BA lattice in this paper. The circumference and the number of the straight sections are preserved for the existing tunnel. The beam energy is reduced to 3 GeV, and the beam emittance is reduced to about 200 pm.rad. The optimized dynamic aperture is about 10 mm in the horizontal plane, and a sufficient beam injection based on the closed orbit bump can be implemented.

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MOPJE026

Revision of the Impedance Model for the Interpretation of the Single Bunch Measurements at ALBA

impedance, vacuum, undulator, simulation

330

T.F.G. Günzel, U. Iriso
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

Recent measurements showed that the ALBA transverse impedance model was able to explain 65% of the measured single bunch vertical detuning. * This report shows the revision of the impedance model developed to match latest single bunch measurements performed to evaluate the total effective machine impedance and impedance of specific elements, like in-vacuum undulators or a recently installed pinger magnet. The model improvement includes a better bunch length parameterisation, re-calculation of several vacuum chamber elements with Gdfidl, and inclusion of elements neglected so far in the impedance budget. We also show and discuss the computation of the resistive wall impedance using ImpedanceWake2D.
* T.Günzel, U.Iriso, F.Perez, E.Koukovini-Platia, G.Rumolo, "Analysis of the single bunch measurements at the ALBA Storage Ring", TUPRI052, proc. of IPAC14 (2014).

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MOPJE028

Detailed Characterization of ALBA Quadrupoles for Beta Function Determination

quadrupole, synchrotron, optics, controls

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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MOPJE033

Coupled Orbit Response Coefficients with Constant Revolution Time

optics, closed-orbit, radio-frequency, diagnostics

354

V.G. Ziemann
Uppsala University, Uppsala, Sweden

We calculate orbit response coefficients for arbitrarily coupled lattice which keep the orbit length constant as is needed to maintain synchronicity with a radio-frequency system.

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MOPMA002

Optimising the Diamond DDBA Upgrade Lattice for Low Alpha Operation

lattice, optics, injection, dynamic-aperture

525

I.P.S. Martin, R. Bartolini
DLS, Oxfordshire, United Kingdom
R. Bartolini
JAI, Oxford, United Kingdom

The Diamond storage ring will be upgraded during 2016 by replacing one of the existing double bend achromat (DBA) cells with a double-DBA (DDBA) cell*. One requirement of the upgrade is that following the installation of the new cell, Diamond should continue to offer dedicated user time in ‘low alpha’ mode**. In this paper we describe the particular challenges relating to this task, and present the lattice design and optimisation studies undertaken so far. The paper concludes by discussing preliminary studies of adding a second DDBA cell into the storage ring.
* R.P. Walker et al., Proc. IPAC 2014, MOPRO103, (2014)
** I.P.S. Martin et al., Proc. IPAC 2013, MOPEA070, (2013)

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MOPMA003

Reconstruction of Electron Bunch Motion During CSR Bursts using Synchronised Diagnostics

electron, detector, synchrotron, radiation

529

I.P.S. Martin, R. Bartolini, C. Bloomer, L.M. Bobb, G. Rehm
DLS, Oxfordshire, United Kingdom
R. Bartolini, A. Finn
JAI, Oxford, United Kingdom

Above a certain threshold current, electron bunches become unstable and emit bursts of coherent synchrotron radiation (CSR). The character and periodicity of these bursts vary with bunch current, RF voltage and lattice momentum compaction. In this paper we describe recent measurements taken at Diamond of how the electron bunch longitudinal profile and energy vary during a burst, and correlate this with CSR emission at a range of wavelengths.

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MOPMA006

Modeling RF Feedback in Elegant for Bunch-Lengthening Studies for the Advanced Photon Source Upgrade

feedback, cavity, injection, impedance

540

T.G. Berenc, M. Borland
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 proposed Advanced Photon Source (APS) multi-bend achromat (MBA) lattice includes a passive bunch-lengthening cavity to alleviate lifetime and emittance concerns. Feedback in the main radio-frequency (rf) system affects the overall impedance presented to the beam in this double rf system. To aid beam stability studies, a realistic model of rf feedback has been developed and implemented in elegant and Pelegant.

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MOPMA008

Simulation of Gas-Scattering Lifetime using Position- and Species-Dependent Pressure and Aperture Profiles

scattering, vacuum, simulation, photon

546

M. Borland, J.A. Carter, H. Cease, B.K. Stillwell
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.
When computing gas-scattering lifetime for storage rings, it is common to use the average pressure, even though it is known that the pressure varies with location in the ring and varies differently for different gas species. In addition, other simplifications are commonly made, such as assuming that the apertures in the horizontal and vertical planes are independent and assuming that the momentum acceptance can be characterized by a single value. In this paper, we describe computation of the elastic- and bremsstrahlung-scattering lifetimes that includes species-specific gas pressure profiles computed with VACCALC and MOLFLOW. In addition, the computations make use of the detailed shape of the dynamic acceptance and the position-dependent momentum acceptance. Comparisons are made to simpler methods for the Advanced Photon Source storage ring and the multi-bend achromat upgrade lattice.

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MOPMA013

Experience with Round Beam Operation at the Advanced Photon Source

coupling, emittance, operation, resonance

562

A. Xiao, L. Emery, V. Sajaev, B.X. Yang
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
Very short Touschek lifetime becomes a common issue for next-generation ultra-low emittance storage ring light sources. In order to reach a longer beam lifetime, such a machine often requires operating with a vertical-to-horizontal emittance ratio close to an unity, i.e. a ‘‘round beam''. In tests at the APS storage ring, we determined how a round beam can be reached experimentally. Some general issues, such as beam injection, optics measurement and corrections, and orbit correction have been tested also. To demonstrate that a round beam was achieved, the beam size ratio is calibrated using beam lifetime measurement.

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MOPMA015

Applications of an MPI Enhanced Simulated Annealing Algorithm on nuSTORM and 6D Muon Cooling

sextupole, lattice, simulation, emittance

568

A. Liu
Fermilab, Batavia, Illinois, USA

The nuSTORM decay ring is a compact racetrack storage ring with a circumference ∼ 480 m using large aperture (∅=60 cm) magnets. The design goal of the ring is to achieve a momentum acceptance of 3.8±10\% GeV/c and a phase space acceptance of 2000 μm·rad. The design has many challenges because the acceptance will be affected by many nonlinearity terms with large particle emittance and/or large momentum offset. In this paper, we present the application of a meta-heuristic optimization algorithm to the sextupole correction in the ring. The algorithm is capable of finding a balanced compromise among corrections of the nonlinearity terms, and finding the largest acceptance. This technique can be applied to the design of similar storage rings that store beams with wide transverse phase space and momentum spectra. We also present the recent study on the application of this algorithm to a part of the 6D muon cooling channel. The technique and the cooling concept will be applied to design a cooling channel for the extracted muon beam at nuSTORM in the future study.

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MOPMA030

Multisymplectic Integrators for Accelerator Tracking Codes

space-charge, plasma, simulation, DTL

614

S.D. Webb, D.L. Bruhwiler
RadiaSoft LLC, Boulder, Colorado, USA

It has been long understood that long time single particle tracking requires symplectic integrators to keep the simulations stable. In contrast, space charge has been added to tracking codes without much regard for this. Indeed, multisymplectic integrators are a promising new field which may lead to more stable and accurate simulations of intense beams. We present here the basic concept, through a spectral electrostatic field solve which is suitable for adapting into existing tracking codes. We also discuss the limitations of current algorithms, and suggest directions for future development for the next generations of high intensity accelerators.

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MOPMA053

Characterizing Betatron Tune Knobs on Duke Storage Ring

wiggler, lattice, operation, betatron

672

H. Hao, 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.
The Duke electron storage ring is a dedicated driver for oscillator Free-Electron Lasers (FELs). A 34-m long straight section of the storage ring can host up to four FEL wigglers in several different configurations. The storage ring magnetic lattice has designed with great flexibility to enable the operation with different wiggler configurations and at different electron beam energies. To realize smooth storage ring operation with various electron beam and wiggler parameters, a sophisticated lattice feedforward compensation scheme and a set of betatron tune knobs have been designed, developed and implemented in the controls system. The built-in compensation and tune knobs have demonstrated to be highly useful to allow transparent operation of the storage ring. To fully understand the effectiveness of the lattice tuning scheme, experiments have been carried to characterize the betatron tune knobs. In this paper, we will outline the measurement techniques and procedures, report experimental results, and make important observations on the usefulness of developing an advanced light source storage ring using accurate knowledge of individual magnets with high-quality measured fields.

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MOPMA055

MuSim, a Graphical User Interface for Multiple Simulation Programs

simulation, interface, detector, target

678

T.J. Roberts
Muons, Inc, Illinois, USA
P.L. Gueye
Hampton University, Hampton, Virginia, USA

MuSim is a new user-friendly program designed to interface to many different particle simulation codes, regardless of their data formats or geometry descriptions. It presents the user with a compelling graphical user interface that includes a flexible 3-D view of the simulated world plus powerful editing and drag-and-drop capabilities. All aspects of the design can be parametrized so that parameter scans and optimizations are easy. It is simple to create plots and display events in the 3-D viewer (with a slider to vary the transparency of solids), allowing for an effortless comparison of different simulation codes. Simulation codes: G4beamline, MAD-X, and MCNP; more coming. Many accelerator design tools and beam optics codes were written long ago, with primitive user interfaces by today’s standards. MuSim is specifically designed to make it easy to interface to such codes, providing a common user experience for all, and permitting the construction and exploration of models with very little overhead. For today’s technology-driven students, graphical interfaces meet their expectations far better than text-based tools, and education in accelerator physics is one of our primary goals.

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MOPMA056

Measurement and Modeling of Single Bunch Wake Field Effects in CESR

emittance, simulation, impedance, wakefield

681

J.R. Calvey, M.G. Billing, W. Hartung, J.D. Perrin, D. L. Rubin, D. Sagan, S. Wang
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Funding: Work supported by NSF PHY-1416318 and NSF DMR 1332208. This research used the National Energy Research Scientific Computing Center, which is supported by DOE Contract No. DE-AC02-05CH11231.
Short-range wake fields have been incorporated into a Bmad-based particle tracking code in order to assess their contribution to current-dependent emittance growth, tune shift, and single bunch instabilities. The wakes are computed for CESR vacuum components using the T3P modeling software. Simulation results are compared with measurements of bunch length, vertical beam size, and coherent tune shift. Additionally, we use insertable scrapers to vary the transverse wake and measure the effect on the beam. We show that a vertical emittance increase at high current may be due to a transverse monopole wake, originating in the lump pump slots throughout CESR.

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MOPMA060

Impedance Measurement for the SPEAR3 Storage Ring

impedance, lattice, vacuum, damping

694

X. Huang, J.J. Sebek
SLAC, Menlo Park, California, USA

We studied the transverse impedance of the SPEAR3 storage ring with tune shift vs. beam intensity, head-tail instability and transverse mode coupling instability measurements. By taking measurements under different machine conditions, we probed the frequency dependence of the impedance, from which an impedance model was built. This model is consistent with instability measurements and previous bunch lengthening results.

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MOPMN016

Decoherence due to Second Order Chromaticity in the NSLS-II Storage Ring

betatron, synchrotron, damping, lattice

737

G. Bassi, A. Blednykh, J. Choi, V.V. Smaluk
BNL, Upton, Long Island, New York, USA

We study decoherence effects due to second order chromaticity for small amplitude kicks, in order to estimate the energy spread from TbT data of the NSLS-II storage ring. The bare lattice case (no Damping Wigglers and Insertion devices) has been considered, due to the long transverse radiation damping time. To minimize the chromatic damping/antidamping from the slow-head tail effect, we used a short train of bunches distributed over consecutive rf-buckets with a high enough average current to obtain a good BPM signal. The vertical and horizontal betatron motion have been excited independently with pinger magnets. In this contribution we limit the discussion to the horizontal case.

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MOPMN020

Longitudinal Impedance of RHIC

synchrotron, impedance, experiment, scattering

746

M. Blaskiewicz, J.M. Brennan, K. Mernick
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.
The longitudinal impedance of the two RHIC rings has been measured using the effect of potential well distortion on longitudinal Schottky measurements. With Z/n about 5 Ω the impedance of the yellow ring is roughly twice that of the blue ring.

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MOPMN021

NSLS-II Storage Ring BPM Button Development

vacuum, impedance, simulation, multipole

748

A. Blednykh, B. Bacha, G. Bassi, W.X. Cheng, C. Hetzel, B.N. Kosciuk, D. Padrazo, O. Singh
BNL, Upton, Long Island, New York, USA

Funding: Work supported by DOE contract DE-AC02-98CH10886
The NSLS-II BPM Button design and its development process have been described. Subjects discussed include BPM Button impedance optimization, design and construction, production, BPM Button selection and a first temperature measurements at 200mA average current within 1200 bunches.

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MOPMN027

Optimization of Dynamic Aperture for Hadron Lattices in eRHIC

sextupole, lattice, hadron, collider

757

Y.C. Jing, V. Litvinenko, D. Trbojevic
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.
The potential upgrade of the Relativistic Heavy Ion Collider (RHIC) to an electron ion collider (eRHIC) involves numerous extensive changes to the existing collider complex. The expected very high luminosity is planned to be achieved at eRHIC with the help of squeezing the beta function of the hadron ring at the IP to a few cm, causing a large rise of the natural chromaticities and thus bringing with it challenges for the beam long term stability (Dynamic aperture). We present our effort to expand the DA by carefully tuning the nonlinear magnets thus controlling the size of the footprints in tune space and all lower order resonance driving terms. We show a reasonably large DA through particle tracking over millions of turns of beam revolution.

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MOPHA001

Transverse Bunch by Bunch Feedback Operations at the Australian Synchrotron Light Source

feedback, operation, resonance, synchrotron

769

R.T. Dowd, M.P. Atkinson, M.J. Boland, G. LeBlanc, Y.E. Tan, K. Zingre
SLSA, Clayton, Australia

The Australian Synchrotron light source has recently put in operation its transverse bunch-by-bunch feedback system during user beam mode. Getting to the stage of stable operation has been a long road and this paper will outline the many difficulties that were encountered. Chief among these are the apparent strong, high frequency, vertical resonances that appear when the storage ring's three in-vacuum undulators are closed to specific gaps. The behaviour of these resonances and their effects on achieving stable feedback operation will be explored in detail.

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MOPHA009

Single-Shot Electro-Optic Sampling Combined With Photonic Time-Stretch: Detailed Results at SOLEIL

laser, synchrotron, detector, real-time

795

C. Szwaj, C. Evain, E. Roussel
PhLAM/CERLA, Villeneuve d'Ascq, France
S. Bielawski
PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
J.B. Brubach, L. Cassinari, M.-E. Couprie, M. Labat, L. Manceron, J.P. Ricaud, P. Roy, M.-A. Tordeux
SOLEIL, Gif-sur-Yvette, France
M. Le Parquier
CERLA, Villeneuve d'Ascq, France

Funding: ANR (DYNACO project), FEDER, CEMPI LABEX.
Single-shot recording of pulses is possible with high repetition rates (more than 80 MHz), as was demonstrated in the framework of a PhLAM-SOLEIL collaboration * **. This can be achieved by a relatively simple upgrade of existing setups based on spectral encoding. The strategy consists to encode the sub-picosecond information into the time domain, but at a slower scale (nanoseconds), using dispersion in a long optical fiber. Then the information is recorded by a photodiode connected to an oscilloscope. In this poster, we present guidelines for the practical realization of the electro-optical setup, as well as a performance analysis. In particular, we analyze the temporal resolution and compare it to the classical electro-optical sampling setup.
* E. Roussel et al., Proceedings of IPAC2014, THOBA01.
** E. Roussel et al., arXiv:1410.7048

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MOPHA039

A Fast Gated Intensified Camera Setup for Transversal Beam Diagnostics at the ANKA Storage Ring

radiation, experiment, synchrotron, bunching

872

P. Schütze, A. Borysenko, E. Hertle, N. Hiller, B. Kehrer, A.-S. Müller, P. Schönfeldt
KIT, Karlsruhe, Germany

ANKA, the synchrotron light source at Karlsruhe Institute of Technology (KIT), can be operated in different modes including the short bunch operation with bunch lengths compressed to a few picoseconds. In this mode, coherent synchrotron radiation (CSR) is emitted leading to beam instabilities. For gaining further insight into those processes, a setup based on a fast gated intensified camera was installed recently at the visible light diagnostics beamline of the ANKA storage ring. The experimental layout consists of an optical setup, which magnifies the image of the beam in the horizontal and demagnifies it in the vertical plane to obtain a projection of the horizontal beam shape, the camera itself and a fast scanning galvanometric mirror that sweeps this image across the sensor. This allows the tracking of the horizontal bunch size and position over many turns. In this paper we present the setup and show first measurement results.

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MOPHA040

First Results of Energy Measurements with a Compact Compton Backscattering Setup at ANKA

laser, electron, photon, detector

876

C. Chang, E. Bründermann, E. Hertle, N. Hiller, E. Huttel, A.-S. Müller, M.J. Nasse, M. Schuh, J.L. Steinmann
KIT, Karlsruhe, Germany
H.-W. Hübers, H. Richter
DLR, Berlin, Germany

Funding: This work is funded by the European Union under contract PITN-GA-2011-289191
An electron energy measurement setup based on the detection of Compton backscattered photons, generated by laser light scattered off the relativistic electron beam, has been proposed and developed for operation at the ANKA storage ring of the Karlsruhe Institute of Technology (KIT). In contrast to conventional methods based on head-on collisions, the setup at ANKA is, for the first time, realized in a transverse configuration where the laser beam hits the electron beam at an angle of ~90°. This makes it possible to achieve a relatively low-cost and very compact setup since it only requires a small side-port instead of a straight section. This development could benefit storage rings with restricted space or where no straight sections are available, for example due to interferences with existing beamlines. The setup and the first measurement results are presented in the paper.

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MOPTY034

Distributed Beam Loss Monitor Based on the Cherenkov Effect in Optical Fiber

electron, radiation, positron, beam-losses

1004

Yu. Maltseva, F.A. Emanov, A.V. Petrenko, V.G. Prisekin
BINP SB RAS, Novosibirsk, Russia
F.A. Emanov
NSU, Novosibirsk, Russia
A.V. Petrenko
CERN, Geneva, Switzerland

A distributed beam loss monitor based on the Cherenkov effect in optical fiber has been implemented for the VEPP5 electron and positron linacs and the 510 MeV damping ring at the Budker INP. The monitor operation is based on detection of the Cherenkov radiation generated in optical fiber by means of relativistic particles created in electromagnetic shower after highly relativistic beam particles (electrons or positrons) hit the vacuum pipe. The main advantage of the distributed monitor compared to local ones is that a long optical fiber section can be used instead of a large number of local beam loss monitors. In our experiments the Cherenkov light was detected by photomultiplier tube (PMT). Timing of PMT signal gives the location of the beam loss. In the experiment with 20 m long optical fiber we achieved 3 m spatial resolution. To improve spatial resolution optimization and selection process of optical fiber and PMT are needed and according to our theoretical estimations 0.5 m spatial resolution can be achieved. We also suggest similar techniques for detection of electron (or positron) losses due to Touschek effect in storage rings.

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MOPTY044

Machine Protection Systems and their Impact on Beam Availability and Accelerator Reliability

operation, linac, software, proton

1029

R. Andersson, E. Bargalló, A. Nordt
ESS, Lund, Sweden
E. Adli
University of Oslo, Oslo, Norway

Over the last decades, the complexity and performance levels of machine protection have developed. The level of reliability and availability analysis prior to operation differs between facilities, just as the pragmatic changes of the machine protection during operation. This paper studies the experience and development of machine protection for some of the state of the art proton and ion accelerators, and how it relates to reducing damage to and downtime of the machine. The findings are discussed and categorized, with emphasis on proton accelerators. The paper is concluded with some recommendations for a future high power linear proton accelerator.

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MOPTY065

Beam Stability of the Taiwan Light Source Storage Ring

betatron, electron, injection, network

1091

H.C. Chen, H.H. Chen, Y.-S. Cheng, S.J. Huang, C.H. Kuo, J.A. Li, Y.K. Lin
NSRRC, Hsinchu, Taiwan

The Taiwan Light Source Storage Ring (SR) has been in operation since many years ago. Maintaining best stability of the electron beam is becoming the main challenge. This study endeavored to improve the electron beam stability of The Taiwan Light Source Storage Ring (SR). Employing the artificial neural network (ANN)-constructed experiment design to analyze and optimize the storage ring betatron tunes .This report outlines the details of the beam stability process experiment.

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MOPTY072

Beam Loss Study of TLS Using RadFETs

injection, radiation, controls, 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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MOPTY073

Commissioning of BPM System for TPS Booster Synchrotron

booster, electronics, synchrotron, injection

1106

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

The TPS is a latest generation of high brightness synchrotron light source and ready for commissioning. It consists of a 150 MeV electron linac, a booster synchrotron, a 3 GeV storage ring, and experimental beam lines. The BPM electronics Libera Brilliance⁺ are adopted for booster and storage ring of Taiwan Photon Source (TPS). The provided BPM data is useful for beam commissioning where it can be used to measure beam position, rough beam intensity along the longitudinal position and also for tune measurement. This report summarizes the efforts on BPM measurement and related diagnostic tools during TPS booster commissioning.

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MOPTY074

Preliminary Beam Test of Synchrotron Radiation Monitoring System at Taiwan Photon Source

synchrotron, booster, radiation, synchrotron-radiation

1109

C.Y. Liao, Y.-S. Cheng, J. -Y. Chuang, K.T. Hsu, S.Y. Hsu, H.P. Hsueh, K.H. Hu, C.K. Kuan, C.Y. Wu
NSRRC, Hsinchu, Taiwan

Taiwan Photon Source (TPS) is a third generation 3 GeV synchrotron light facility. The synchrotron radiation from a dipole can be used to observe the beam parameters. The synchrotron radiation monitor (SRM) systems were designed and implemented for the booster synchrotron and storage ring. The SRM for the booster synchrotron can serve to diagnose the energy ramping process. The beam size decreases when the energy increases was observed. In the storage ring, the streak camera was preferred to observe the beam behaviour of the consecutive bunches. The bunch length and longitudinal instability were observed. The preliminary beam test results are summarized in this report.

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MOPTY075

Vibration Measurement of the Magnets in the Storage Ring of TPS

quadrupole, ground-motion, dipole, data-acquisition

1112

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

Taiwan photon source is a 3rd generation synchrotron light source which is in beam commissioning at NSRRC. Orbit stability within 100 nm range is essential for such a small emittance light source. Technical noise from the vacuum pumps, water flow, etc. will cause the vibration of quadrupoles and deleterious orbit stability. In order to investigate the magnitude of vibration in the magnets of the storage ring, the vibration spectra of the lattice quadruples; the coherence between the magnets, girders and ground will be systematic investigated in this report.

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MOPTY079

The Installation and Operation of TPS Laser PSD System in TPS Storage Ring

laser, alignment, operation, electron

1123

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

24 sets of Laser PSD positioning system are parts of the TPS girder auto¬alignment system. Laser PSD positioning systems are installed in the straight¬ section girders of TPS storage ring. The Laser PSD systems are assembled and calibrated in the Lab beforehand. The Laser and PSDs are assembled on girder and transported to TPS storage ring and Installed. During construction the system deviates from the normal position caused by variant temperature and external influence. For absolute position precision, another laser calibration system should be built to recalibrate the laser PSD system. This paper describes the installation of Laser PSD system in TPS storage ring and the status of the PSD system. A new absolute position calibration method for precision upgrade is also discussed.

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MOPTY080

A Multi-band Single Shot Spectrometer for Observation of mm-Wave Bursts at Diamond Light Source

detector, synchrotron, radiation, synchrotron-radiation

1126

A. Finn, P. Karataev
JAI, Egham, Surrey, United Kingdom
G. Rehm
DLS, Oxfordshire, United Kingdom

Micro-bunch instabilities (MBI) have been detected at many light sources across the world. The radiation bursts produced as a result of this instability occur in the millimetre wavelength regime. In order to understand more about the mechanism of MBI and improve the accuracy of simulations, more information is needed about the dynamics and spectral content of the radiation. A single shot spectrometer has therefore been developed to investigate this instability at Diamond Light Source. Due to their low noise, ultra-fast response and excellent sensitivity, Schottky detector diodes are employed. Currently, seven Schottky detectors are in place covering a range of 33-750 GHz. Unlike previous measurements at Diamond, each of the Schottky detectors has been characterised thus allowing the results obtained to be more easily compared to simulations. In this paper, we present the calibration of each Schottky detector in the spectrometer, the first results of tests with beam, as well as future plans for the spectrometer.

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MOPWI006

Development of a Supersonic Gas-jet Monitor to Measure Beam Profile Non-destructively

ion, vacuum, electron, experiment

1157

H.D. Zhang, A. Jeff, V. Tzoganis, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
A. Jeff
CERN, Geneva, Switzerland
A. Jeff, V. Tzoganis, C.P. Welsch, H.D. Zhang
The University of Liverpool, Liverpool, United Kingdom
V. Tzoganis
RIKEN, Saitama, Japan

Funding: This project is supported by Helmholtz Association(VH-NG-328), EU’s 7th Framework Program for research, technological development and demonstration( 215080) and STFC Cockcroft core grant(ST/G008248/1).
The measurement of the transverse beam profile is a great challenge for high intensity, high brightness and high power particle beams due to their destructive power. Current non-destructive methods such as residual gas monitors and beam induced fluorescence monitors either require a rather long integration time or residual gas pressures in the order of 10^-7 mbar to make meaningful measurements. A supersonic gas-jet beam profile monitor has been developed by QUASAR group at the Cockcroft Institute, UK and promises significant improvements over these established techniques. In this monitor, a supersonic gas curtain is generated that crosses the beam to be analyzed under an angle of 45°. When both beams interact, ionization of the gas jet particles occurs and these ions are then accelerated by an electrostatic extraction field towards a Micro Channel Plate (MCP). Beam images are then obtained via a phosphor screen-CCD camera combination. In this contribution, we discuss the monitor design and present beam profile measurements of a 5 keV electron beam. These are complemented by results from measurements using a pulsed valve to study the gas jet dynamics.

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MOPWI022

Experimental Study of a Two-Color Storage Ring FEL

FEL, wiggler, operation, electron

1198

J. Yan, H. Hao, S.F. Mikhailov, V. Popov, Y.K. Wu
FEL/Duke University, Durham, North Carolina, USA
S. Huang
PKU, Beijing, People's Republic of China
J.Y. Li
USTC/NSRL, Hefei, Anhui, People's Republic of China
N. Vinokurov
BINP SB RAS, Novosibirsk, Russia
J. Wu
SLAC, Menlo Park, California, USA

Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033.
Multi-color Free-electron Lasers (FELs) have been developed on linac based FELs over the past two decades. On the storage ring, the optical klystron (OK) FEL in its early days was demonstrated to produce lasing at two adjacent wavelengths with their spectral separation limited by the bandwidth of single wiggler radiation. Here, we report a systematic experimental study on the two-color operation at the Duke FEL facility, the first experimental demonstration of a tunable two-color harmonic FEL operation of a storage ring based FEL. We demonstrate a simultaneous generation of two FEL wavelengths, one in infrared (IR) and the other in ultraviolet (UV) with a harmonic relationship. The experimental results show a good performance of the two-color FEL operation in terms of two-color wavelength tunability, power tunability and power stability.

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MOPWI030

Low Emittance Tuning With a Witness Bunch

betatron, emittance, lattice, coupling

1223

D. L. Rubin, R.E. Meller, J.P. Shanks
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Funding: Work supported by NSF PHY-1416318, PHY-0734867 and PHY-1002467, and DOE DE-FC02-08ER- 41538 and DE-SC0006505
Electron positron damping rings and colliders will require frequent tuning to maintain ultra-low vertical emittance. Emittance tuning begins with precision beam based measurement of lattice errors (orbit, transverse coupling, and dispersion) followed by compensation with corrector magnets. Traditional techniques for measuring lattice errors are incompatible with simultaneous operation of the storage ring as light source or damping ring. Dedicated machine time is required. The gated tune tracker (the device that drives the beam at the normal mode frequencies) and the bunch-by-bunch, turn-by-turn beam position monitor system developed at CESR are integrated to allow synchronous detection of phase. The system is capable of measuring lattice errors during routine operation. A single bunch at the end of a train of arbitrary length, is designated as the witness. The witness bunch alone is resonantly excited, and the phase and amplitude of the witness is mea- sured at each of the 100 beam position monitors. Lattice errors are extracted from the measurements. Corrections are then applied. The emittance of all of the bunches in the train is measured and the effectiveness of the correction procedure demonstrated.

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MOPWI031

Microwave Modeling for Electron Cloud Density Measurements at CesrTA

simulation, resonance, electron, synchrotron

1227

J.P. Sikora, Y. Li
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
S. De Santis
LBNL, Berkeley, California, USA

Funding: This work is supported by the US National Science Foundation PHY-0734867, PHY-1002467, and the US Department of Energy DE-FC02-08ER41538, DE-SC0006505.
The electron cloud (EC) density in accelerator beam-pipe has been measured using resonant microwaves. The resonances are produced by changes in beam-pipe geometry that generate reflections and standing waves, with typical behavior being similar to a section of waveguide with shorted ends. The technique uses fact that the EC density will shift the resonant frequencies. In previous analysis, we have made the simplifying approximation that the standing waves are multiples of a half-wavelength and that the magnitude of the electric field is symmetric about the longitudinal center of the resonance. In this paper we show that some changes in beam-pipe geometry will result in asymmetric electric field magnitudes along the resonant length. When this is combined with an EC density that varies along this length, the magnitude of the frequency shift will be altered. We present our initial attempt to correct for this effect by modeling the existing beam-pipe using CST Microwave Studio(R) to obtain a more realistic electric field distribution. This correction is then applied to data taken with beam at several resonant frequencies. The measurements were made at the Cornell Electron Storage Ring (CESR), which has been reconfigured as a test accelerator (CesrTA) providing electron or positron beams ranging in energy from 2 to 5 GeV.
* http://dx.doi.org/10.1016/j.nima.2014.03.063

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TUXC2

Engineering Challenges of Future Light Sources

vacuum, feedback, emittance, synchrotron

1308

R.T. Neuenschwander, L. Liu, S.R. Marques, A.R.D. Rodrigues, R.M. Seraphim
LNLS, Campinas, Brazil

We review some of the present engineering challenges associated with the design and construction of ultra-low emittance storage rings, the 4th generation storage rings (4GSR). The field is experiencing a growing interest since MAX-IV, followed by Sirius, started to build storage rings based on multi-bend-achromat (MBA) lattices. It was the recent progress in accelerator technology that allowed these facilities to base their designs on this kind of lattice. Although the challenges are starting to be overcome, many issues are still open and a lot of R&D is required until the 4GSR achieve optimal performance.

Slides TUXC2 [7.022 MB]

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TUXC3

Commissioning of the Taiwan Photon Source

booster, quadrupole, emittance, synchrotron

1314

C.-C. Kuo, C.-T. Chen, J.Y. Chen, M.-S. Chiu, P.J. Chou, K.T. Hsu, Y.C. Liu, G.-H. Luo, H.-J. Tsai, F.H. Tseng
NSRRC, Hsinchu, Taiwan

The Taiwan Photon Source (TPS) is a 3-GeV third-generation synchrotron light source located in Hsinchu, Taiwan. After ground breaking on February 7, 2010 and five years of construction and hardware developments, commissioning of the beam began on December 12, 2014. The booster ring reached the design energy of 3 GeV on December 16. Beam transferred to the storage ring and first accumulation at 3 GeV produced the first synchrotron light on December 31. This report presents results and experience of the TPS commissioning.

Slides TUXC3 [5.425 MB]

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TUAB2

First Collective Effects Measurements in NSLS-II with ID's

impedance, lattice, vacuum, quadrupole

1332

A. Blednykh, B. Bacha, G. Bassi, W.X. Cheng, J. Choi, Y. Hidaka, Y. Li, B. Podobedov, T.V. Shaftan, V. Smalyuk, T. Tanabe, G.M. Wang, F.J. Willeke, L.-H. Yu
BNL, Upton, Long Island, New York, USA

Funding: Work supported by DOE contract DE-AC02-98CH10886.
As another important milestone towards the final goal to store an average current of 500mA, the average current of 200mA, distributed within ~1000 bunches, was recently achieved in the NSLS-II storage ring after the installation of three Damping Wigglers and four In-Vacuum Undulators. First measurements of the collective effects and instability thresholds, both in single- and multi-bunch mode, are discussed.

Slides TUAB2 [2.691 MB]

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TUPWA001

Measurement of the Incoherent Depth of Field Effect on Horizontal Beam Size Using a Synchrotron Light Interferometer

electron, photon, synchrotron, lattice

1391

M.J. Boland
SLSA, Clayton, Australia
W.J. Corbett
SLAC, Menlo Park, California, USA
T.M. Mitsuhashi
KEK, Ibaraki, Japan

The electron beam size as measured using synchrotron light in a circular accelerator is influenced by the incoherent depth of field effect. This effect comes about due to the instantaneous opening angle of the emitted synchrotron radiation (SR) and the acceptance angle of the SR light monitor beamline. Measurements were made using a visible light interferometer at the visible light beamlines in three circular accelerators at ATF, SPEAR3 and AS. The first order spatial coherence of the beam was measured and from that the horizontal beam size was calculated. The data is compared with a theory of synchrotron radiation with and without the horizontal incoherent field depth effect.

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TUPWA002

Layout Options for the AXXS Injector and XFEL

linac, FEL, lattice, dipole

1394

M.J. Boland, Y.E. Tan, D. Zhu
SLSA, Clayton, Australia

A new injector is being planned for the Australian Synchrotron that is designed to feed both an upgraded storage ring and an XFEL. The desire to fit the AXXS project on the same site as the existing light source presents several layout difficulties. Several options are studied and simulations are performed to check the impact each choice has on the beam performance.

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TUPWA004

Operator Roles at the Australian Synchrotron

operation, synchrotron, controls, database

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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TUPWA006

SIRIUS ACCELERATORS STATUS REPORT

booster, vacuum, dipole, quadrupole

1403

A.R.D. Rodrigues, F.C. Arroyo, O.R. Bagnato, J.F. Citadini, R.H.A. Farias, J.G.R.S. Franco, L. Liu, S.R. Marques, R.T. Neuenschwander, C. Rodrigues, R.M. Seraphim, O.H.V. Silva
LNLS, Campinas, Brazil

Sirius is a 3 GeV synchrotron light source that is being built by the Brazilian Synchrotron Light Laboratory (LNLS). The electron storage ring is based on a modified 5BA cell to achieve a bare lattice emittance of 0.27 nm.rad in a 518 m circumference ring that contains 20 straight sections of alternating 6 and 7 meters in length. The 5BA cell accommodates a thin permanent magnet high field (2 T) dipole in the center of the middle bend producing hard X-ray radiation (εc=12 keV) with a modest contribution to the total energy loss. In this paper we discuss the main achievements and issues for Sirius accelerators. Developments in beamlines are not discussed here.

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TUPWA012

SOLEIL Status Report

undulator, operation, photon, vacuum

1419

A. Nadji, Y.-M. Abiven, F. Bouvet, P. Brunelle, A. Buteau, N. Béchu, L. Cassinari, M.-E. Couprie, X. Delétoille, C. Herbeaux, N. Hubert, N. Jobert, M. Labat, J.-F. Lamarre, P. Lebasque, A. Lestrade, A. Loulergue, P. Marchand, O. Marcouillé, J.L. Marlats, L.S. Nadolski, R. Nagaoka, P. Prigent, K.T. Tavakoli, M.-A. Tordeux, M. Valléau
SOLEIL, Gif-sur-Yvette, France

The 2.75 GeV synchrotron light source SOLEIL (France) delivers photons to 27 beamlines and 2 new ones are under construction. The commissioning of the Femtoslicing operation mode involving two beamlines is in progress. The uniform filling pattern is now available to users with a 500 mA stored beam current. The operation of the two canted and long beamlines ANATOMIX and Nanoscopium both using in-vacuum insertion devices (IDs) as a photon source has been raising challenges still under investigation. Upgrades of crucial subsystem equipment like magnet power supplies, storage ring RF input power couplers, and solid state amplifiers are continuing. New user requests for beam stability are under upgrade consideration. Other projects for the storage ring are ongoing such as the design and construction of new insertion devices, new multipole injection kicker, localised small and round photon beam production, as well as R&D on 500 MHz solid-state amplifiers. In parallel first studies for a future upgrade of the machine have been progressing.

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TUPWA021

A New Method to Generate Ultrashort and Coherent Pulses of Short-Wavelength Synchrotron Radiation

laser, electron, radiation, synchrotron

1448

S. Khan
DELTA, Dortmund, Germany

Funding: Work supported by the BMBF (contract 05K13PE3)
A laser-based method to generate ultrashort pulses of synchrotron radiation in electron storage rings is coherent harmonic generation (CHG) using two undulators to produce coherent radiation at harmonics of the initial laser wavelength by microbunching. The bunching factor and thus the pulse intensity, however, decreases exponentially with increasing harmonic order. Echo-enabled harmonic generation (EEHG), proposed in 2009 as FEL seeding scheme*, can be used to produce short synchrotron radiation pulses at higher harmonics, but requires three undulators in a straight section. In this paper, a less space-consuming method based on seeding with intensity-modulated laser pulses is introduced, which also has the potential of significant bunching factors at high harmonics.
* G. Stupakov, PRL 102 (2009), 074801.

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TUPWA025

Beam Heat Load Analysis with COLDDIAG: A Cold Vacuum Chamber for Diagnostics

electron, diagnostics, vacuum, synchrotron

1459

R. Voutta, S. Casalbuoni, S. Gerstl, A.W. Grau, T. Holubek, D. Saez de Jauregui
KIT, Eggenstein-Leopoldshafen, Germany
R. Bartolini, M.P. Cox, E.C. Longhi, G. Rehm, J.C. Schouten, R.P. Walker
DLS, Oxfordshire, United Kingdom
M. Migliorati, B. Spataro
INFN/LNF, Frascati (Roma), Italy

The knowledge of the heat intake from the electron beam is essential to design the cryogenic layout of superconducting insertion devices. With the aim of measuring the beam heat load to a cold bore and understanding the responsible mechanisms, a cold vacuum chamber for diagnostics (COLDDIAG) has been built. The instrumentation comprises temperature sensors, pressure gauges, mass spectrometers and retarding field analyzers, which allow to study the beam heat load and the influence of the cryosorbed gas layer. COLDDIAG was installed in the storage ring of the Diamond Light Source from September 2012 to August 2013. During this time measurements were performed for a wide range of machine conditions, employing the various measuring capabilities of the device. Here we report on the analysis of the measured beam heat load, pressure and gas content, as well as the low energy charged particle flux and spectrum as a function of the electron beam parameters.

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TUPWA036

Possibility of Longitudinal Bunch Compression in Petra III

emittance, optics, FEL, undulator

1492

I.V. Agapov
XFEL. EU, Hamburg, Germany
S.I. Tomin
NRC, Moscow, Russia
R. Wanzenberg
DESY, Hamburg, Germany

A scheme of short bunch production in storage rings using a longitudinally focusing insertion was presented in *. In this work we study the possibility of integrating such insertion into the PetraIII storage ring. In particular, we discuss possible optics solutions to integrate RF stations, chicane-type delay sections, and the undulators into existing ring geometry.
* I. Agapov and G. Geloni, proc. FEL 2014.

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TUPWA043

Non-interferometric Spectral Analysis of Synchrotron Radiation in the THz regime at ANKA

synchrotron, radiation, synchrotron-radiation, electron

1509

J.L. Steinmann, M. Brosi, E. Bründermann, C.M. Caselle, E. Hertle, N. Hiller, B. Kehrer, A.-S. Müller, M. Schuh, M. Schwarz, P. Schönfeldt, P. Schütze
KIT, Karlsruhe, Germany
J.L. Hesler
Virginia Diodes Inc., Charlottesville, USA

Interferometry is the quasi-standard for spectral measurements in the THz- and IR-range. The frequency resolution, however, is limited by the travel range of the interferometer mirrors. Therefore, a resolution in the low megahertz range would require interferometer arms of about 100 m. As an alternative, heterodyne measurements provide a resolution in the Hertz range, an improvement of 6 orders of magnitude. Here we present measurements done at ANKA with a VDI WR3.4SAX, a mixer that can be tuned to frequencies from 220 GHz to 330 GHz and we show how the bunch filling pattern influences the amplitude of specific frequencies.

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TUPWA064

Study of Inherent Potential for Emittance Reduction at the SPring-8 Storage Ring

optics, brilliance, emittance, photon

1573

Y. Shimosaki
JASRI/SPring-8, Hyogo-ken, Japan

A design study for an upgrade project of the SPring-8, the SPring-8-II, is in progress, which is a full-scale major lattice modification. Besides the design study for the SPring-8-II, an inherent potential of achieving much higher brilliance than that of the present SPring-8 has been explored for the general evaluation. In this paper, the evaluation of the inherent potential for the SPring-8, not for the SPring-8-II, in terms of increasing the brilliance is discussed.

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TUPJE004

Narrow Band Coherent Edge Radiation at UVSOR-III

radiation, electron, experiment, laser

1613

M. Hosaka, O. Oodake, Y. Takashima, N. Yamamoto
Nagoya University, Nagoya, Japan
S. Bielawski, C. Szwaj
PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
M. Katoh, T. Konomi, J. Yamazaki
UVSOR, Okazaki, Japan
H. Zen
Kyoto University, Kyoto, Japan

Edge radiation can be an interesting new light source because of its property that the radiation is well collimated and is radially polarized. We are developing coherent light sources in the THz region at UVSOR-III storage ring. We have already succeeded in producing a narrow band coherent THz radiation by manipulating the interaction of a relativistic electron bunch with an amplitude modulated laser with. Recently a simplified tentative beamline for detection of the edge radiation is installed at downstream of a short straight section of UVSOR-III. Coherent radiation from electron bunches after the interaction with the amplitude modulated laser is observed. Detailed measurements of polarizations and special distribution of the radiation are underway. The latest status of the study will be reported.

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TUPJE005

Development of Pulsed Multipole Magnet for Aichi SR Storage Ring

electron, injection, multipole, synchrotron

1616

K. Ito, M. Hosaka, A. Mano, T. Takano, Y. Takashima
Nagoya University, Nagoya, Japan
K. Hayashi, M. Katoh
UVSOR, Okazaki, Japan
N. Yamamoto
KEK, Ibaraki, Japan

The Aichi synchrotron radiation (Aichi SR) center is an industrial oriented synchrotron light source facility. The electron energy and circumference of the storage ring are 1.2 GeV and 72 m. The natural emittance is 53 nm-rad. Since the pulsed multipole injection scheme provides great advantages for relatively smaller SR rings*, we are developing a pulsed multipole injection system for Aichi SR storage ring. In this system, it is essential to minimize the perturbation to the stored beam. To realize the required performances, we have to minimize the residual field at stored beam position, taken into account the field generated by the copper current lead of the input terminal. In addition, we carried out the analytical calculation to estimate the magnet field due to the current lead and optimized the geometrical structure of them. Construction of the multipole magnet will be completed in March 2015 and the field measurement will be carried out in April. In this presentation, we report the detail of the magnet design and the measurement results of pulsed magnetic field for the manufactured magnet.
* N. Yamamoto, et. al., NIM A 767, 26-33 (2014)

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TUPJE015

Beta Function Matching and Tune Compensation for HLS-II Insertion Devices

insertion, insertion-device, undulator, electron

1647

B. Li, J.Y. Li, W. Xu, K. Xuan
USTC/NSRL, Hefei, Anhui, People's Republic of China

In order to increase its brightness and improve the performance, the Hefei Light Source (HLS) was completely renovated from 2010 to the end of 2014. The magnet lattice of the new storage ring consists of four double bend achromatic (DBA) cells. There are eight straight sections which can be used to install up to 6 insertion devices (IDs). Currently, five insertion devices have been installed in the storage ring. It is known that the dynamics of the electron beam motion in the storage ring would be influenced by the insertion device, depending on its physical properties. In order to keep high performance operation of the storage ring and make the insertion device transparent to the rest of the storage ring, a complex compensation scheme is developed to match the beta functions at both ends of a ID and perform transverse tune compensation. This scheme has been integrated into the EPICS based control system of the HLS-II. The result indicates that the scheme is very effective to compensate the impact of the insertion devices.

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TUPJE018

On-axis Injection Scheme for Ultimate Storage Ring with Double RF Systems

injection, synchrotron, emittance, radiation

1657

B.C. Jiang, S.Q. Tian, M.Z. Zhang, Q.L. Zhang, Z.T. Zhentang
SINAP, Shanghai, People's Republic of China

An on-axis injection scheme using double RF systems for an ultimate storage ring which holds very small dynamic aperture is proposed. By altering RF voltages, empty RF buckets can be created which will be used for on-axis injection. After bunches are injected, a reverse voltage altering process is performed and the injected bunches can be longitudinally dumped to the main buckets.

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TUPJE023

Consideration on the Future Major Upgrades of the SSRF Storage Ring

injection, cavity, emittance, optics

1672

Z.T. Zhao, B.C. Jiang, Y.B. Leng, S.Q. Tian, L. Yin, M.Z. Zhang
SINAP, Shanghai, People's Republic of China

The SSRF storage ring was in operation from 2008, currently it is operating at the energy of 3.5GeV, the natural emittance of 3.9 nm-rad and the beam current of 240 mA, serving for 13 beamlines with 9 IDs. There will be around 40 operated beamlines around 2020, which need some upgrade of the storage ring existing performance, such as the new lattice with superbends. And looking for the future beyond, the major upgrade towards a diffraction limited storage ring is under consideration. This paper presents the initial investigation and the proposal on the ultimate storage ring upgrade for SSRF.

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TUPJE034

A Preliminary Report from Louisiana State University CAMD Storage Ring Operating with an 11-pole 7.5 T Wiggler

wiggler, operation, electron, injection

1682

R.S. Amin, P. Jines, D.J. Launey, K.J. Morris, V.P. Suller, Y. Wang
LSU/CAMD, Baton Rouge, Louisiana, USA
V.K. Lev, N.A. Mezentsev, V.A. Shkaruba, V.M. Syrovatin, O.A. Tarasenko, V.M. Tsukanov, A.A. Volkov, A.V. Zorin
BINP SB RAS, Novosibirsk, Russia

Funding: Funded by the National Science Foundation.
Louisiana State University installed a 7.5 T superconducting wiggler in May 2013 on the electron storage ring located at the Bennett Johnson, Sr. Center for Advanced Microstructures and Devices (CAMD). The wiggler’s influence on betatron tunes and functions, orbit, lifetime, performance, and other relevant beam parameters are described. We further comment on device operations and modifications to ring operations that were necessary to provide light for both wiggler and dipole stations.

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TUPJE035

Optimization of Turn-by-Turn Measurements at Soleil and Alba Light Sources

quadrupole, lattice, betatron, synchrotron

1686

M. Carlà, G. Benedetti, Z. Martí
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
L.S. Nadolski
SOLEIL, Gif-sur-Yvette, France

Turn-by-turn measurements paves the way for fast storage ring diagnostics. On the other hand turn-by-turn technique is by its very nature delicate, requiring an extensive system tuning and understanding. During last year several attempts to recover linear model informations from turn-by-turn measurements has been carried out in cooperation between the synchrotrons of SOLEIL and ALBA. A routine to extract phase advance and betatron amplitude from turn-by-turn measurements in presence of damping has been developed. Moreover a procedure to retrieve quadrupole errors from such observables has been developed tested and verified against the traditional diagnostics tools based on closed orbit measurements. A comparison between the different methods and the performance of the two different experimental setups are reported.

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TUPJE038

Impact of Insertion Devices on the MAX IV Storage Rings

lattice, optics, quadrupole, octupole

1696

S.C. Leemann, H. Tarawneh
MAX-lab, Lund, Sweden

There will be multiple compensations employed for insertion devices in the MAX IV storage rings. Apart from well-known dipole corrections and previously detailed local and global linear optics matching, certain insertion devices in the MAX IV storage rings will also require nonlinear optics adjustments and/or skew quadrupole corrections. The goal of such corrections is ensuring sufficient dynamic aperture as well as low residual emittance coupling. This paper will present a few studies that rely on tracking through kick maps in order to quantify detrimental effects of insertion devices on dynamic aperture and vertical emittance, develop suitable countermeasures, and finally, verify restored storage ring performance.

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TUPJE042

Transverse Tunes Determination from Mixed BPM Data

betatron, operation, injection, coupling

1709

P. Zisopoulos, F. Antoniou, Y. Papaphilippou
CERN, Geneva, Switzerland
E. Hertle, A.-S. Müller
KIT, Eggenstein-Leopoldshafen, Germany

Decoherence due to non-zero chromaticity and/or amplitude dependent tune-shift, but also damping mechanisms can affect the accurate tune determination by leaving a limited number of turns for frequency analysis of the turn by turn (TbT) position data. In order to by-pass these problems, Fourier analysis of mixed TBT data from all BPMs can be employed. The approach is applied in two different accelerators, a hadron collider as the LHC and a synchrotron light source as the ANKA storage ring. The impact in the accuracy of the method of missing BPM data is also discussed.

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TUPJE044

Local Orbit Response Matrix Measurement at SLS

quadrupole, optics, focusing, feedback

1713

M. Aiba, M. Böge
PSI, Villigen PSI, Switzerland

The experimental determination of linear optics is essential to achieve a high performance ring accelerator. One of the methods, linear optics from closed orbits (LOCO), is widely employed to correct linear optics. Due to the ring nature, a quadrupole error at a location of the ring affects the entire orbit response measurement data. The orbit response, however, can be localised to a certain range of the ring when an orbit feedback (or correction) is applied to the rest of the ring. The quadrupole errors located in the range, where the feedback is acting, then have no impact, and the ring optics can be locally examined. An application of this technique to Swiss light source is discussed.

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TUPJE047

Design Studies for an Upgrade of the SLS Storage Ring

emittance, lattice, radiation, operation

1724

A. Streun, M. Aiba, M. Böge, M.P. Ehrlichman, A. Saá Hernández
PSI, Villigen PSI, Switzerland

An upgrade of the Swiss Light Source (SLS) would replace the existing storage ring by a low aperture multibend achromat lattice providing an emittance of about 100–200 pm at 2.4 GeV, while maintaining the hall, the beam lines and the injector. Since emittance scales inversely cubically with the number of lattice cells, an SLS upgrade is challenged by the comparatively small ring circumference of only 288 m. A new concept for a compact low emittance lattice is based on longitudinal gradient bending magnets for emittance minimization and on anti-bends (i.e bends of opposite field polarity) to disentangle dispersion and horizontal beta function in order to provide the optimum matching to the longitudinal gradient bends while minimizing the contribution to chromaticity.

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TUPJE048

Orbit Correction and Stability Studies for Ultra-Low Emittance Storage Rings

photon, emittance, simulation, dipole

1728

M. Böge, M. Aiba, A. Streun
PSI, Villigen PSI, Switzerland

Ultra-low emittance storage rings exhibit extremely strong focusing and sextupolar chromaticity corrections. The therefore mandatory excellent centering of the closed orbit in the small aperture magnets is a challenging task and necessitates a proper beam diagnostics and correction layout. Correction and stability studies for a possible ultra-low emittance upgrade of the Swiss Light Source are presented.

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TUPJE061

Injection Studies for the Diamond Storage Ring

septum, injection, kicker, lattice

1768

I.P.S. Martin, M. Apollonio, R. Bartolini
DLS, Oxfordshire, United Kingdom
R. Bartolini
JAI, Oxford, United Kingdom

The Diamond storage ring will be upgraded during 2016 by replacing one of the existing double bend achromat (DBA) cells with a double-DBA (DDBA) cell*. It is anticipated that both the on and off momentum dynamic aperture will reduce as a result of this change. In order to prepare for this eventuality, injection into the Diamond storage ring has been recently studied in detail. In particular, the oscillation amplitude, angle and energy of the injected beam have been determined, along with the position of the stored beam with respect to the septum plate. Following these studies, the injected beam energy has been matched to the storage ring, and plans have been put in place to move the injection septum 4 mm closer to the stored beam centre line.
*R.P. Walker et al., “The Double-Double Bend Achromat (DDBA) Lattice Modification for the Diamond Storage Ring”, Proc. IPAC 2014, MOPRO103, (2014)

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TUPJE062

First Transparent Realignment Tests at the Diamond Storage Ring

controls, alignment, survey, 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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TUPJE068

Development and Performance of 1.1-m Long Superconducting Undulator at the Advanced Photon Source

undulator, photon, dipole, operation

1794

Y. Ivanyushenkov, C.L. Doose, J.F. Fuerst, E. Gluskin, K.C. Harkay, Q.B. Hasse, M. Kasa, Y. Shiroyanagi, D. Skiadopoulos, E. Trakhtenberg
ANL, Argonne, Ilinois, USA

Funding: Work supported by U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
Development of superconducting undulators continues at the Advanced Photon Source (APS). The second superconducting undulator, SCU1, has been built and installed in the storage ring of the APS. This undulator has a 1.1-m long superconducting magnet and utilizes an improved version of the cryostat of the first superconducting undulator, SCU0. The results of the cold test of the SCU1, and its performance in the APS storage ring are presented in this paper.

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TUPJE075

Simulation Study of Injection Performance for the Advanced Photon Source Upgrade

injection, simulation, emittance, kicker

1816

A. Xiao, V. Sajaev
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
A vertical on-axis injection scheme has been proposed for the hybrid seven-bend-achromat (H7BA) Advanced Photon Source upgrade (APSU) lattice. In order to evaluate the injection performance, various errors, such as injection beam jitter, optical mismatch and errors, and injection element errors have been investigated and their significance has been discovered. Injection efficiency is then simulated under different error levels. Based on these simulation results, specifications and an error-budget for individual systems have been defined.

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TUPJE084

Development of Nonlinear Injection Kicker Magnet for ALS Accelerator

injection, kicker, power-supply, operation

1837

G.C. Pappas, D.J. Baum, J.-Y. Jung, D. Robin, C. Steier, C. Sun, C.A. Swenson
LBNL, Berkeley, California, USA

Funding: This work was supported by Lawrence Berkeley National Laboratory under U.S. Department of Energy Contract No. DE-AC02-05CH11231.
The ALS in now engaged in the construction of a new hard x-ray beam line and insertion device for protein crystallography. The scope of work entails the reconfiguration of ALS Sectors 1-3 to make room for the new insertion device. The project will require the melioration of the ALS injection system as well as the development of a longitudinal RF kicker. A key aspect of the injector work is the development and integration of a nonlinear injection kicker (NLK) magnet system to facilitate top off injection without noticeable motion of the beam. The technology will, in principal, ultimately allow the removal of the conventional bump injection magnets presently located in ALS Sector 1. The nonlinear injection concept has been explored at several other light sources *. We examine the beam dynamics and magnet design requirements to adapt this technology to the ALS lattice with its 1.9 GeV beam. The work will review the injection beam matching, tracking simulations, the electromagnetic design and tolerance analysis, power supply design. The paper will also review the project plan for the integration of this technology into the ALS.
* T. Atkinson et al., "Development of a Non-Linear Kicker System to Facilitate a New Scheme for the BESSY-II Storage Ring", Proc. of IPAC 2011, THPH024.

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TUPMA012

Developing an Improved Pulsed Mode Operation for Duke Storage Ring Based FEL

FEL, operation, wiggler, damping

1860

S.F. Mikhailov, H. Hao, V. Popov, Y.K. Wu
FEL/Duke University, Durham, North Carolina, USA

Funding: This work is supported in part by the US DoE grant # DE-FG02-97ER41033
The Duke FEL and High Intensity Gamma-ray Source (HIGS) facility is operated with an e-beam from 0.24 to 1.2 GeV and a photon beam from 190 to 1060 nm. Currently, the energy range of the gamma-ray beam is from 1 MeV to about 100 MeV, with the maximum total gamma-ray flux about 3·10¹⁰ gammas per second around 10 MeV. The FEL is typically operated in quasi-CW mode. Some HIGS user experiments can benefit tremendously from a pulsed mode of FEL operation. For that purpose, a fast steering magnet was developed years ago to modulate the FEL gain. This FEL gain modulator decouples the e-beam from the FEL beam in the interaction region for most of time, but periodically allows a brief overlap of the electron and FEL beams. This allows us to build up a high peak power FEL pulse from a well-damped electron beam. However, the use of this gain modulator at low e-beam energies can dramatically limit e-beam current due to beam instability and poor injection. To overcome these shortcomings, we have successfully tested an RF frequency modulation technique to pulse the FEL beam. In this paper, we will describe this development, and report our preliminary results of this improved pulsed FEL operation.

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TUPMA016

Light Source and Accelerator Physics Research Program at Duke University

FEL, wiggler, operation, electron

1866

Y.K. Wu
FEL/Duke University, Durham, North Carolina, USA

Funding: This work is supported in part by the US DOE grant no. DE-FG02-97ER41033.
The light source and accelerator physics research program at Duke Free-Electron Laser Laboratory (DFELL), TUNL, is focused on the development of the storage ring based free-electron lasers (FELs), and a state-of-the-art Compton gamma-ray source, the High Intensity Gamma-ray Source (HIGS) which is driven by the storage ring FEL. With a maximum total flux about 3·10¹⁰ gamma/s and a spectral flux of more than 1,000 gamma/s/eV around 10 MeV, the HIGS is the world's most intense Compton gamma-ray source. Operated in the energy range from 1 to 100 MeV, the HIGS is a premier Compton gamma-ray facility in the world for a variety of nuclear physics research programs, both fundamental and applied. In this paper, we will describe our ongoing light source development to produce gamma-ray beams in the higher energy range of 100 and 158 MeV. We will also provide a summary of our recent accelerator physics and FEL physics research activities.

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TUPMA022

CESR Upgrade as a High-Energy, High-Brightness X-Ray Light Source

emittance, positron, electron, lattice

1884

J.P. Shanks, D. L. Rubin
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

Funding: Research supported by NSF grant DMR-1332208.
The Cornell Electron Storage Ring (CESR) operates most of the year as the Cornell High Energy Synchrotron Source (CHESS). CESR was originally designed and operated as an electron/positron collider, circulating high-emittance beams in order to maximize luminosity. Beam lines were developed to extract x-rays from both electron and positron beams. The two beams share a common vacuum chamber, and are electrostatically separated to avoid collisions. The requirement to store counter-rotating beams significantly constrains the storage ring optics, limiting emittance and, beam current, and bunch distributions. The proposed upgrade eliminates two-beam operation in favor of a single optimized on-axis beam. Several new undulator-based beam lines are planned. The horizontal emittance is reduced in steps, first from 90nm to 20nm at 5.3 GeV, and then in a ring-wide upgrade to as low as 300 pm-rad at 6GeV. The low-emittance optics are based on multi-bend achromats with combined function bends. The details of the optics, apertures, and magnet parameters are presented.

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TUPMA050

NSLS-II Injector Commissioning and Initial Operation

booster, linac, operation, injection

1944

E.B. Blum, B. Bacha, G. Bassi, J. Bengtsson, A. Blednykh, S. Buda, W.X. Cheng, J. Choi, J. Cupolo, R. D'Alsace, M.A. Davidsaver, J.H. De Long, L. Doom, D.J. Durfee, R.P. Fliller, M. Fulkerson, G. Ganetis, F. Gao, C. Gardner, W. Guo, R. Heese, Y. Hidaka, Y. Hu, M.P. Johanson, B.N. Kosciuk, S. Kowalski, S.L. Kramer, S. Krinsky, Y. Li, W. Louie, M.A. Maggipinto, P. Marino, J. Mead, J. Oliva, D. Padrazo, K. Pedersen, B. Podobedov, R.S. Rainer, J. Rose, M. Santana, S. Seletskiy, T.V. Shaftan, O. Singh, P. Singh, V.V. Smaluk, R.M. Smith, T. Summers, J. Tagger, Y. Tian, W.H. Wahl, G.M. Wang, G.J. Weiner, F.J. Willeke, L. Yang, X. Yang, E. Zeitler, E. Zitvogel, P. Zuhoski
BNL, Upton, Long Island, New York, USA
A. Akimov, P.B. Cheblakov, I.N. Churkin, A.A. Derbenev, S.M. Gurov, S.E. Karnaev, V.A. Kiselev, A.A. Korepanov, E.B. Levichev, S.V. Sinyatkin, A.N. Zhuravlev
BINP SB RAS, Novosibirsk, Russia

The injector for the National Synchrotron Light Source II storage ring consists of a 3 GeV booster synchrotron and a 200 MeV S-band linac. The linac was designed to produce either a single bunch with a charge of 0.5 nC of electrons or a train of bunches up to 300 ns long containing a total charge of 15 nC. The booster was designed to accelerate up to 15 nC each cycle. Linac commissioning was completed in April 2012. Booster commissioning was started in November 2013 and completed in March 2014. All of the significant design goals were satisfied including beam emittance, energy spread, and transport efficiency. While the maximum booster charge accelerated was only 10 nC this has proven to be more than sufficient for storage ring commissioning. The injector has operated reliably during storage ring operation since then. Results will be presented showing measurements of injector operating parameters achieved during commissioning and initial operation. Operating experience and reliability during the first year of NSLS-II operation will be discussed.

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TUPMA052

NSLS-II Radio Frequency Systems

cavity, feedback, operation, booster

1947

J. Rose, F. Gao, B. Holub, J.G. Kulpin, C. Marques
BNL, Upton, Long Island, New York, USA
A. Goel
ANL, Argonne, Ilinois, USA
M. Yeddulla
Varian Medical Systems, Inc., Palo Alto, California, USA

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. The NSLS-II RF system consists of the master oscillator, digital low level RF controllers, linac, booster and storage ring RF sub-systems, as well as a supporting cryogenic system. Here we will report on RF commissioning and early operation experience of the system.

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TUPMA053

Experience with First Turns Commissioning in NSLS-II Storage Ring

injection, kicker, betatron, lattice

1950

S. Seletskiy, G. Bassi, J. Bengtsson, A. Blednykh, E.B. Blum, W.X. Cheng, J. Choi, R.P. Fliller, W. Guo, R. Heese, Y. Hidaka, S.L. Kramer, Y. Li, B. Podobedov, T.V. Shaftan, G.M. Wang, F.J. Willeke, L. Yang, X. Yang
BNL, Upton, Long Island, New York, USA

In this paper we describe our experience with commissioning of the first turns in the NSLS-II storage ring. We discuss the problems that we encountered and show how applying a dedicated first turns commissioning software allowed us to diagnose and resolve these problems.

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TUPMA054

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

software, GUI, lattice, controls

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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TUPMA055

Analysis of Possible Beam Losses in the NSLS II Storage Ring

radiation, dipole, shielding, electron

1956

S. Seletskiy, R.P. Fliller, W. Guo, S.L. Kramer, Y. Li, B. Podobedov, T.V. Shaftan, W.H. Wahl, F.J. Willeke
BNL, Upton, Long Island, New York, USA

The NSLS-II accelerators are installed within radiation shielding walls that are designed to attenuate the radiation generated from an assumed beam loss power to a level of <0.5mrem/h at the outer surface of the bulk shield walls. Any operational losses greater than specified level are expected to be addressed by installing supplemental shielding near the loss point in order to attenuate the radiation outside the shield wall to the design level. In this paper we report the analysis of the electron beam mis-steering in the NSLS-II storage ring for the determination of supplementary shielding.

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TUPMA056

Analysis of Possible Beam Losses in the NSLS II BSR Transfer Line

booster, radiation, shielding, extraction

1959

S. Seletskiy, R.P. Fliller, W. Guo, S.L. Kramer, Y. Li, B. Podobedov, T.V. Shaftan, W.H. Wahl, F.J. Willeke
BNL, Upton, Long Island, New York, USA

The NSLS-II accelerators are installed within 0.8 – 1 m thick radiation shielding walls. The safety considerations require attenuating the radiation generated from possible electron beam losses to a level of <0.5mrem/h at the outer surface of the bulk shield walls. Any operational losses greater than specified level shall be addressed by installing supplemental shielding near the loss point. In this paper we discuss simulation studies that identified potential beam loss locations. Results of these studies were used for identification of imposed radiation risks and for specification of the supplemental shielding design necessary to mitigate those risks.

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TUPMA057

Commissioning of Active Interlock System for NSLS II Storage Ring

synchrotron, radiation, synchrotron-radiation, photon

1962

S. Seletskiy, C. Amundsen, J. Choi, J.H. De Long, K.M. Ha, C. Hetzel, H.-C. Hseuh, Y. Hu, P. Ilinski, S.L. Kramer, Y. Li, M.A. Maggipinto, J. Mead, D. Padrazo, T.V. Shaftan, G. Shen, O. Singh, R.M. Smith, W.H. Wahl, G.M. Wang, F.J. Willeke, L. Yang
BNL, Upton, Long Island, New York, USA

The NSLS-II storage ring is protected from possible damage from insertion devices (IDs) synchrotron radiation by a dedicated active interlock system (AIS). It monitors electron beam position and angle and triggers beam drop if beam orbit exceeds the boundaries of pre-calculated active interlock envelope. In this paper we describe functional details of the AIS and discuss our experience with commissioning of the AIS for the first six IDs installed in the storage ring.

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TUPHA006

NSLS-II Storage Ring Insertion Device and Front-End Commissioning

emittance, injection, insertion, SRF

1974

G.M. Wang, C. Amundsen, G. Bassi, J. Bengtsson, A. Blednykh, E.B. Blum, W.X. Cheng, J. Choi, O.V. Chubar, T.M. Corwin, M.A. Davidsaver, L. Doom, W. Guo, D.A. Harder, P. He, Y. Hidaka, Y. Hu, P. Ilinski, C.A. Kitegi, S.L. Kramer, Y. Li, M. Musardo, D. Padrazo, B. Podobedov, K. Qian, R.S. Rainer, J. Rank, S. Seletskiy, T.V. Shaftan, S.K. Sharma, O. Singh, V. Smalyuk, R.M. Smith, T. Summers, T. Tanabe, F.J. Willeke, L. Yang, X. Yang, L.-H. Yu
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. In the spring 2014, the storage ring was commissioning up to 50 mA without insertion device. In the fall, the project beamlines, includes seven insertion devices on six ID ports were commissioned within two and a half months. These beamlines consist of IXS, HXN, CSX-1, CSX-2, CHX, SRX, and XPD-1, from the radiation sources elliptically polarizing undulator (EPU), damping wiggler (DW) and in vacuum undulator (IVU) to cover the VUV through the very hard x-ray range. In this paper, a number of commissioning and operation experiences are discussed here, such as injection, lifetime, ID residual field and compensation, source point stability, beam alignment and tools for control, monitor and beam protection.

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TUPHA009

NSLS-II Storage Ring Coupling Measurement and Correction

coupling, betatron, quadrupole, kicker

1983

G.M. Wang, Y. Li, T.V. Shaftan, L. Yang, L.-H. Yu
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. To achieve the goal, 8 pm level vertical beam emittance, the coupling due to the misalignment in quads and vertical beam offset in sextuples must be corrected. Traditional method, based on response matrix, such as LOCO, is wildly used measure and corrects the coupling. In this paper, we present a new method to measure and correct the coupling with BPMs TBT data from fast kickers or pingers excited betatron oscillation. Besides the TBT data, other method, is also used to characterize the coupling.

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TUPHA010

Design of the NSLS-II Top Off Safety System

dipole, interlocks, injection, operation

1986

R.P. Fliller, L. Doom, G. Ganetis, C. Hetzel, P.K. Job, Y. Li, T.V. Shaftan, S.K. Sharma, O. Singh, G.M. Wang, Z. Xia
BNL, Upton, Long Island, New York, USA

The NSLS-II accelerators finished commissioning in the fall of 2014, with beamline commissioning underway. Part of the design for the NSLS-II is to operate in top off mode. The Top Off Safety System (TOSS) is presently under design. In this report we discuss the Top Off Safety System design and implementation, along with the necessary tracking results and radiological calculations.

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TUPHA012

LOCO Application to NSLS2 SR Dispersion and Beta Beating Correction

quadrupole, optics, ion, lattice

1989

X. Yang
BNL, Upton, Long Island, New York, USA
X. Huang, J.A. Safranek
SLAC, Menlo Park, California, USA

During the short run in early July, 2014, we made changes to the Matlab LOCO setup for NSLS-II and applied LOCO successfully to the machine. The MML setup was verified with I/O tests for all quadrupole families. The LOCO setup was further tested with an intentional quadrupole error. After the successful LOCO correction, the rms beta beat was reduced from the initial values of 5.5% x and 5.6% y, to 1.9% x and 1.0% y, respectively. The rms horizontal dispersion error was reduced from 21 mm to 6 mm. It is critical to keep the same closed orbit for LOCO correction to take effect. Because presently some correctors are nearly saturated, closed orbit cannot be controlled for additional iterations. We expect LOCO to achieve better optics correction after the orbit control is improved.

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TUPTY063

FCC-ee: Energy Calibration

polarization, wiggler, electron, simulation

2177

M. Koratzinos, A.P. Blondel
DPNC, Genève, Switzerland
E. Gianfelice-Wendt
Fermilab, Batavia, Illinois, USA
F. Zimmermann
CERN, Geneva, Switzerland

FCC-ee aims to improve on electroweak precision measurements, with goals of 100 keV on the Z mass and width, and a fraction of an MeV on the W mass. Compared to LEP, this implies a much improved knowledge of the centre-of-mass energy when operating at the Z peak and WW threshold. This contribution will describe how it is planned to achieve this, by making systematic use of resonant depolarization. A number of difficulties have been identified, due in particular to the long polarization time and amplified ground motion. However the smaller emittance and energy spread of FCC-ee with respect to LEP should help achieve a much improved performance.

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WEAB2

Beam and Spin Dynamics for Storage Ring Based EDM Search

dipole, simulation, resonance, experiment

2454

A. Lehrach
FZJ, Jülich, Germany

Funding: On behalf of the JEDI collaboration and JARA-FAME (Jülich Aachen Research Alliance)
Permanent EDMs (electric dipole moment) of fundamental particles violate both time invariance T and parity P. Assuming the CPT theorem this implies CP violation. The Standard Model (SM) predicts non-vanishing EDMs, their magnitudes, however, are expected to be unobservably small with current techniques. Hence, the discovery of a non-zero EDM would be a signal for “new physics”. As a first step towards EDM searches of charged particles in storage rings, R&D work at the Cooler Synchrotron COSY is pursued. On a longer time scale, the design and construction of a dedicated storage ring will be carried out. Spin-tracking simulations are absolutely crucial to explore the feasibility of the planned storage ring EDM experiments and to investigate systematic limitations. For a detailed study during the storage and buildup of the EDM signal, one needs to track a large sample of particles for billions of turns. Benchmarking experiments are performed at the Cooler Synchrotron COSY to check and to further improve the simulation tools and prototype accelerator components are tested. Finally, the layout of a dedicated storage ring has to be optimized by a full simulation of spin motion.

Slides WEAB2 [1.459 MB]

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WEBD3

Recent Developments on Superconducting Undulators at ANKA

undulator, operation, vacuum, permanent-magnet

2485

S. Casalbuoni, A. Cecilia, S. Gerstl, N. Glamann, A.W. Grau, T. Holubek, C.A.J. Meuter, D. Saez de Jauregui, R. Voutta
KIT, Eggenstein-Leopoldshafen, Germany
C. Boffo, T.A. Gerhard, M. Turenne, W. Walter
Babcock Noell GmbH, Wuerzburg, Germany

At the synchrotron ANKA (ANgstrom source KArlsruhe) we pursue a research and development program on superconducting undulators (SCUs). This technology is of interest to improve the spectral characteristics of the emitted photons in third and fourth generation light sources. We present here the results obtained within the ongoing collaboration with the industrial partner Babcock Noell GmbH (BNG) on NbTi conduction cooled planar devices. Investigations on the application of alternative superconductors as well as a summary of the achievements reached to precisely characterize the magnetic field properties of SCUs and to measure the beam heat load to a cold bore are also described.

Slides WEBD3 [2.581 MB]

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WEPWA033

Characterization of Laser-plasma Accelerated Electron Beam for a Compact Storage Ring

laser, electron, plasma, target

2569

S. H. Park, Y. Cha, Y.U. Jeong, J.S. Jo, H.N. Kim, K.N. Kim, K. Lee, W.J. Ryu, J.S. Shinn, N. Vinokurov
KAERI, Daejon, Republic of Korea
N. Vinokurov
BINP SB RAS, Novosibirsk, Russia

A compact radiation source can be utilized by an electron beam from a Laser-plasma acceleration combined with localized shielding in a small laboratory. The stability of synchrotron radiation in wavelength and power depends on the shot-to-shot jitters of the energy and charge of an electron beam, which is strongly influenced by the plasma density of target and the jitters of a laser beam. With the 30 TW fs laser in KAERI, the optimization for generating the electron beam have done using the different shape of gas nozzle. We also present the pointing stability and the energy spread of the laser-accelerated electron beams.

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WEPMA003

Vacuum System Design for the Sirius Storage Ring

vacuum, radiation, dipole, synchrotron

2744

R.M. Seraphim, O.R. Bagnato, R.O. Ferraz, H.G. Filho, G.R. Gomes, M. Nardin, R.F. Oliveira, B.M. Ramos, A.R.D. Rodrigues, M.B. Silva, T.M. da Rocha
LNLS, Campinas, Brazil

Sirius is a 3 GeV 4th-generation light source under construction by the Brazilian Synchrotron Light Laboratory (LNLS). Sirius will have a low emittance storage ring, 0.28 nm-rad, based on 20 cells of a highly compact lattice – 5-bend achromat (5BA). This lattice concept leaves very little space for components and therefore requires narrow vacuum chambers with tight mechanical tolerances. Most of the storage ring vacuum chambers will be made of OFS copper and have a circular cross section with inner diameter of 24 mm and a wall thickness of 1 mm. The unused synchrotron radiation will be distributed along the water cooled walls of the chambers. Due to the small conductance of the chambers, the vacuum pumping will be based on distributed concept and then non-evaporable getter (NEG) coating will be extensively used, with more than 95% of the chambers being coated. In this paper, we present an overview of the storage ring vacuum system and the main vacuum chambers fabrication developments.

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WEPMA049

Development of the Ceramic Chamber Integrated Pulsed Magnet Fitting for a Narrow Gap

power-supply, vacuum, dipole, kicker

2879

C. Mitsuda, T. Honiden, N. Kumagai, S. Sasaki
JASRI/SPring-8, Hyogo-ken, Japan
T. Nakanishi
SES, Hyogo-pref., Japan
A. Sasagawa
KYOCERA Corporation, Higashiomi-city, Shiga, Japan

We are pushing forward the development of a pulsed magnet that has a combined structure of magnet coils with a ceramic vacuum chamber, aiming to realize a small gap. The structure we are developing is that single turn air-coils are implanted along the longitudinal axis in the cylindrical ceramic chamber wall with thickness of 5mm. The ceramic wall works for separating the vacuum from the atmosphere, as well as holding the coil structures mechanically and the electrical insulation of coils. By this structure, magnet pole edges can be set close to the inside diameter of the chamber. The small gap increases magnetic field strength, which is for shorter length, and, as a result, the small magnet size reduces the inductance, which is for shorter pulse. We achieved the continuous operation over 200 days, without any failure, of current-excitation with 20 kV, 7.7 kA pulse with 4-μsec width and repetition of 1 Hz, using the dipole type prototype with a bore radius of 30 mm and magnetic length of 0.3m in 2013, while maintaining the vacuum pressure less than 10^-6 Pa. In this conference, we will discuss about the availability and practical utility with the magnetic field output performance.

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WEPMN023

Vacuum System of the Storage Ring of HLS-II

vacuum, synchrotron, radiation, synchrotron-radiation

2976

Y. Wang, L. Fan, Y.Z. Hong, X.T. Pei, J. Wang, W. Wei, B. Zhang
USTC/NSRL, Hefei, Anhui, People's Republic of China

HLS storage-ring has been operated for more than twenty-five years. In 2014 we began to upgrade the machine, which is called HLS-II. The emittance is reduced to 40 nmrad, five insertion devices are added and the injection energy increases to 800MeV. Now the machine commissioning has already been completed. The typical life time is 300 mins at 300mA, 800MeV. The average pressure of static and dynamic vacuum are below 2×10^-8 Pa and 1.2×10-7 Pa respectively. The design, installation and commissioning of the vacuum system of the storage ring are detailedly stated in this paper.

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WEPMN037

High Power Klystron Amplifiers for the PLS & PLS-II Storage Ring

klystron, operation, cathode, high-voltage

3012

M.-H. Chun, Y.D. Joo, H.J. Park, I.S. Park, Y.U. Sohn, I.H. Yu
PAL, Pohang, Kyungbuk, Republic of Korea

Funding: Ministry of Science, ICT and Future Planning in Korea
The RF system of the Pohang Light Source-II (PLS-II) storage ring is operating at the 3.0 GeV/340 mA with three superconducting RF cavities. PLS-II RF system was upgraded to 3.0 GeV/400 mA (max.) beam storage from 2.5 GeV/ 200 mA of PLS. Each high power RF (HPRF) station is composed of a 300 kW klystron with power supplies, transmission components including a 350 kW circulator and load, and water cooling system. The klystrons are generally operated as a RF power source with high gain amplification for RF system of light sources. This paper describes the present operation status of 300 kW klystron amplifier and experiences of the former PLS 75 kW klystron amplifiers as well as RF system.
*Supported by the Ministry of Science, ICT and Future Planning in Korea

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WEPMN043

The RF Stability of PLS-II Storage Ring RF System

cavity, controls, LLRF, EPICS

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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WEPMN050

A Pinger Magnet System for the ALBA Synchrotron Light Source

kicker, electron, high-voltage, simulation

3039

M. Pont, N. Ayala, G. Benedetti, M. Carlà, Z. Martí, R. Núñez-Prieto
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

A pinger magnet system consisting of two short kickers, one for each transversal plane, has been recently commissioned at the ALBA Synchrotron Light Source. The kickers can excite large betatron oscillations on the electron beam in order to probe the linear and non-linear beam dynamics regime together with the turn-by turn capabilities of the BPMs. The kickers are mounted in a single Ti coated ceramic vacuum chamber, have a length of 0.3 m each and provide a half sine pulse with a pulse length of 1 μs at an amplitude of 1.4 mrad and the pulser unit is based on solid state technology. This report summarises the steps followed from its design until its installation, electric and magnetic characterisation in the laboratory, and the first results with beam.

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WEPMN062

MAX IV 3 GeV Storage Ring Magnet Block Production Series Measurement Results

dipole, sextupole, synchrotron, octupole

3069

M.A.G. Johansson, L.-J. Lindgren, M. Sjöström, P.F. Tavares
MAX-lab, Lund, Sweden

The magnet design of the MAX IV 3 GeV storage ring replaces the conventional support girder + discrete magnets scheme of previous third-generation synchrotron radiation light sources with a compact (Ø25 mm aperture) integrated design having several consecutive magnet elements precision-machined out of a common solid iron block, with mechanical tolerances of ±0.02 mm over the 2.3–3.4 m block length. The production series of 140 integrated magnet block units, which was totally outsourced to industry, was completed mid-2014, with mechanical/magnetic QA conforming to specifications. This article presents mechanical and magnetic field measurement results of the full production series.

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WEPMN066

Hall Probe Measurements of 80 Unit Cell Magnets for the MAX-IV Storage Ring

dipole, quadrupole, synchrotron, alignment

3076

A.A.F. Ahl
Scanditronix Magnet AB, Vislanda, Sweden

80 unit cell magnet segments have been manufactured by Scanditronix Magnet for the 3 GeV storage ring at MAX-IV in Lund, Sweden. All of the magnets have been approved by Max-lab after a large field measuring campaign using both a high precision hall probe bench, as well as a new rotating coil system. Each unit cell magnet consists of one dipole, two quadrupole, three sextupole and one vertical and one horizontal corrector magnets. The hall probe bench was used to measure the dipole magnet (with combined dipole and quadrupole component) as well as the quadrupole magnets. This poster will focus on the hall probe measurements performed on the dipole magnets from the perspective of a manufacturer. E.g. the repeatability of the measurements and the relation between field performance and mechanical tolerances will be analyzed.

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WEPHA027

Solid State Amplifier Development for the Swiss Light Source

klystron, booster, operation, power-supply

3170

M.A. Gaspar, T. Garvey
PSI, Villigen PSI, Switzerland

Funding: We acknowledge the financial support of the Swiss Commission for Technology and Innovation under grant number 13192.1 PFFLM-IW.
The Paul Scherrer Institut currently operates a klystron amplifier on the booster ring of the Swiss Light Source (SLS). In order to have an optional RF source for the booster cavity, we have been developing a compact 500MHz – 65kW solid state RF amplifier. An important goal in this development is the optimization of efficiency at any given operating point. In order to achieve this, each RF module has been equipped with its own DC power supply (PS Controller), providing sufficient intelligence to adjust the drain and bias voltages in a fully independent and automatic way. With this technique it is possible to maximize the overall efficiency at any given RF output power. Considerable effort has been made in order to obtain extensive measurements from each individual module with the aim of investigating the behavior of such a large number of combined arrays. We will discuss the amplifier design and present the results of measurements.

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WEPHA029

Operation of Both utility Systems of TPS and TLS at NSRRC

controls, 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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WEPHA034

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

booster, controls, photon, target

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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WEPHA037

DESIGN STORAGE RING AND BOOSTER RING POWER SUPPLY CABLING IN TAIWAN PHOTON SOURCE

booster, power-supply, dipole, quadrupole

3194

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

For this paper is studies the storage ring and booster ring power supply cabling design, Papers can be divided into cabling design, control and instrument area construction (CIA), and testing; design including estimated cable length and arrangement, the CIA construction part site of the cable erection and overcome barriers of space; detection section is high resistance meter and insulation testing. Circumference of booster ring is 496.8 meter and storage ring is 518.4 meter, TPS (Taiwan Photon Source) beam current is 500mA at 3GeV. Booster Ring dipole into BD and BH series 54 magnets, cable size is 250 mm2 and total length of 5000m. Booster Ring and storage ring quadrupole 150 magnets and cable size 250 mm2, total length of 17000m. Storing Ring dipole 48 magnets cable size 325 mm2, total length of 6000m. On the positive and negative voltage cables will produce magnetic interference effects generated through cabling overlapped technology eliminates magnetic interference. Finally, using a high-impedance machine to detect cabling insulation effect. TPS power supply to the energy transfer is to ensure safe and correct magnet.

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WEPHA042

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

controls, simulation, 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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WEPHA044

Alignment Design and Status of Taiwan Photon Source

survey, network, alignment, booster

3212

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

After the construction of Taiwan Photon Source (TPS) was finished, the variation of the survey fiducials was stable. However, the following precise alignment work is concerned by the change of temperature critically. In this paper, the whole process of alignment work in the TPS storage ring with the relation of survey network and thermal issues of the environment will be described. We analysed these survey data so that the correction of survey network could be estimated by the change of temperature, thus all the elements for example, booster, pedestals, and girders could be positioned within the shortest time.

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WEPHA046

Outgassing Analysis During Transport for 14m Long Arc-Cell Vacuum Chambers of the Taiwan Photon Source

vacuum, ion, photon, electron

3219

L.H. Wu, C.K. Chan, C.H. Chang, C.-C. Chang, S.W. Chang, Y.P. Chang, B.Y. Chen, J.-R. Chen, Z.W. Chen, C.M. Cheng, G.-Y. Hsiung, S-N. Hsu, H.P. Hsueh, C.S. Huang, Y.T. Huang, T.Y. Lee, I.C. Yang
NSRRC, Hsinchu, Taiwan
J.-R. Chen
National Tsing Hua University, Hsinchu, Taiwan

An outgassing analysis during transportation for the large, 14-m-long, ultra-high-vacuum aluminum arc-cell chambers of the Taiwan Photon Source (TPS) was performed using residual gas analysis (RGA). Each cell was baked to 150 °C in the laboratory to achieve ultra-high vacuum. Under pumping by primarily ion pumps (IP) and non-evaporable getter (NEG) pumps, the cells obtained pressures of 6.4×10^-9 Pa on average, and the main residual gas was H2. Here, vacuum pressure measurements and residual gas analyses were performed in situ while a cell chamber was being transported. It was found that the vibration of the arc-cell vacuum chamber caused the pressure to rise abruptly; in this case, the main outgassing gas was CH4. Once the arc cell had been fully installed, the vacuum pressure gradually decreased to the original vacuum pressure because of the pumping effect of the ion gauges.

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WEPHA048

Behavior of Vacuum Pressure in TPS Vacuum System

vacuum, booster, synchrotron, photon

3222

I.C. Yang, C.K. Chan, C.-C. Chang, B.Y. Chen, J.-R. Chen, C.M. Cheng, J. -Y. Chuang, G.-Y. Hsiung, C.K. Kuan, C.C. Liang, I.C. Sheng, L.H. Wu
NSRRC, Hsinchu, Taiwan

Taiwan Photon source (TPS) is in its first stage commissioning in 2014-2015. The vacuum systems of TPS were installed for commissioning since August 2014. After four months performance testing and subsystem integration, the commissioning of booster ring began on 12 December and then the first 3 GeV beam was stored on 31 December. 100mA beam current, 35Ah accumulated beam dose was archived in March 2015 before machine shut down. The average pressure in storage ring is 2.8×10^-8 Pa before commissioning, rising to 1.33×10-7 Pa with 100mA beam current. In 35Ah accumulated beam dose, the target of beam cleaning effect has reached to 8.92×10-10 Pa/mA. The vacuum performance, experience and events during commissioning will be presented in this paper.

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WEPWI052

Commissioning and Early Operation Experience of the NSLS-II Storage Ring RF System

cavity, operation, synchrotron, klystron

3606

F. Gao, J. Cupolo, P. Davila, T. Dilgen, W.K. Gash, B. Holub, J.G. Kulpin, J. Papu, G. Ramirez, V. Ravindranath, B. Rose, J. Rose, R. Sikora, J. Tagger, M. Yeddulla
BNL, Upton, Long Island, New York, USA

The National Synchrotron Light Source II (NSLS-II) is a 3 GeV X-ray user facility commissioned in 2014. The storage ring RF system, essential for replenishing energy loss per turn of the electrons, consists of digital low level RF controllers, 310 kW CW klystron transmitters, CESR-B type superconducting cavities, as well as a supporting cryogenic system. Here we will report on RF commissioning and early operation experience of the system for beam current up to 200 mA.

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THYB2

The Auto-Alignment Girder System of TPS Storage Ring

alignment, controls, 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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THPF031

Towards an RF Wien-Filter for EDM Experiments at COSY

dipole, resonance, polarization, betatron

3761

S. Mey, R. Gebel
FZJ, Jülich, Germany

Funding: The work is supported within the framework of the Helmholtz Association’s Accelerator Research and Development (ARD) program.
The JEDI Collaboration (Jülich Electric Dipole Moment (EDM) Investigations) is developing tools for the measurement of permanent EDMs of charged, light hadrons in storage rings. The Standard Model predicts unobservably small values for the EDM, but a non-vanishing EDM can be detected by measuring a tiny build-up of vertical polarization in a beforehand horizontally polarized beam. This technique requires a spin tune modulation by an RF Dipole without any excitation of beam oscillations. In the course of 2014, a prototype RF ExB-Dipole has been successfully commissioned and tested. To determine the characteristics of the device, the force of a radial magnetic field is canceled out by a vertical electric one. In this configuration, the dipole fields form a Wien-Filter that directly rotates the particles' polarization vector. We verified that the device can be used to continuously flip the vertical polarization of a 970 MeV(c deuteron beam without exciting any coherent beam oscillations. For a first EDM Experiment, the RF ExB-Dipole in Wien-Filter Mode is going to be rotated by 90° around the beam axis and will be used for systematic investigations of sources for false EDM signals.

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THPF146

Spin Coherence Time Lengthening of a Polarized Deuteron Beam Using Sextupole FieldsFields

polarization, sextupole, emittance, electron

4066

G. Guidoboni
UNIFE, Ferrara, Italy

Funding: Forschungszentrum Jülich is a member of the Helmholtz Association
The measurement of a non-zero electric dipole moment (EDM) aligned along the spin of sub-atomic particles would probe new physics beyond the standard model. It has been proposed to search for the EDM of charged particles using a storage ring and a longitudinally polarized beam. The EDM signal would be a rotation of the polarization from the horizontal plane toward the vertical direction as a consequence of the radial electric field always present in the particle frame. This experiment requires ring conditions that can ensure a lifetime of the in-plane polarization (spin coherence time, SCT) up to 1000 s. At the COoler SYnchrotron (COSY) located at the Forschungszentrum Jülich, the JEDI collaboration has begun to examine the effects of emittance and momentum spread on the SCT of a polarized deuteron beam at 0.97 GeV/c. The set of data presented here shows how second-order effects from emittance and momentum spread of the beam affect the lifetime of the horizontal polarization of a bunched beam. It has been observed that sextupole fields can correct for depolarizing sources and increase the spin coherence time up to hundreds of seconds while setting the chromaticities equal to zero.

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