Keyword: diagnostics
Paper Title Other Keywords Page
MOBL1 Instrumentation and Results from the SwissFEL Injector Test Facility radiation, transverse, electron, laser 12
 
  • R. Ischebeck, V.R. Arsov, S. Bettoni, B. Beutner, M.M. Dehler, A. Falone, F. Frei, I. Gorgisyan, Ye. Ivanisenko, P.N. Juranic, B. Keil, F. Löhl, G.L. Orlandi, M. Pedrozzi, P. Pollet, E. Prat, T. Schietinger, V. Schlott, B. Smit
    PSI, Villigen PSI, Switzerland
  • P. Peier
    DESY, Hamburg, Germany
  
  The SwissFEL Injector Test Facility (SITF) has been equipped with numerous prototype diagnostics (BPMs, screen monitors, wire scanners, optical synchrotron radiation monitor, compression (THz) monitor, bunch arrival time monitor, EO spectral decoding monitor, charge and loss monitor) specifically designed for the low charge SwissFEL operation modes. The design of the diagnostics systems and recent measurement results will be presented.  
slides icon Slides MOBL1 [35.165 MB]  
 
MOBL2 Thermalized and Reaccelerated Beams at the National Superconducting Cyclotron Laboratory ion, acceleration, cyclotron, injection 19
 
  • S.J. Williams, T. Baumann, K. Cooper, A. Lapierre, D. Leitner, D.J. Morrissey, G. Perdikakis, J.A. Rodriguez, S. Schwarz, A. Spyrou, M. Steiner, C. Sumithrarachchi
    NSCL, East Lansing, Michigan, USA
  • W. Wittmer
    FRIB, East Lansing, Michigan, USA
  
  Funding: This work is supported by the National Science Foundation under contract number RC100609.
The National Superconducting Cyclotron Laboratory at Michigan State University is a Radioactive Ion Beam (RIB) facility providing beams of exotic nuclear species through projectile fragmentation. The Coupled Cyclotron Facility accelerates stable ion beams to ~100 MeV/A which are then fragmented and selected with the A1900 separator. A recent addition to NSCL is the gas stopping facility which thermalizes the high energy beam. The RIBs are extracted at <60keV and selected by A/Q for further transport to the low energy areas, currently consisting of the BECOLA beam cooling and laser spectroscopy system, and LEBIT Penning trap. RIBs up to 6 MeV/A will be provided by the ReA post-accelerator, currently consisting of an EBIT, RFQ and superconducting RF cavities. Energies up to 1.5 MeV/A are presently available, and energy increases will be phased in with the addition of further cryomodules. In a campaign of commissioning experiments, RIBs from a fragmentation facility were thermalized and post-accelerated for the first time. Preliminary results will be presented, focussing on the diagnostic challenges of detecting and characterizing beams over a wide range of energy and rate. 		 
slides icon Slides MOBL2 [2.084 MB]  
 
MOBL3 Electron Bunch Diagnostic at the Upgraded ELBE Accelerator: Status and Challenges ELBE, electron, laser, pick-up 23
 
  • M. Kuntzsch, S. Findeisen, M. Gensch, B.W. Green, J. Hauser, S. Kovalev, U. Lehnert, P. Michel, F. Röser, Ch. Schneider, R. Schurig
    HZDR, Dresden, Germany
  • A. Al-Shemmary, M. Bousonville, M.K. Czwalinna, T. Golz, H. Schlarb, B. Schmidt, S. Schulz, N. Stojanovic, S. Vilcins
    DESY, Hamburg, Germany
  • E. Hass
    Uni HH, Hamburg, Germany
  
  Within the ELBE upgrade towards a Center for High Power Radiation Sources (HSQ), a mono energetic positron, a liquid lead photo neutron source and two new THz sources have been installed at the superconducting electron linac at ELBE. A variety of established as well as newly developed electron beam diagnostics were installed and tested. In this paper we want to present first results achieved with the currently existing prototype beam arrival time and bunch compression monitors (BAM, BCM) as well as one versatile EOS set-up. Based on these future developements and upgrades are discussed.  
slides icon Slides MOBL3 [3.578 MB]  
 
MOCL3 Emittance and Momentum Diagnostics for Beams with Large Momentum Spread quadrupole, CLIC, emittance, transverse 37
 
  • M. Olvegård, V.G. Ziemann
    Uppsala University, Uppsala, Sweden
  
  In the drive beam complex of CLIC, but also in plasma wakefield accelerators, the momentum spread can be on the order of tens of percent while conventional diagnostic methods often assume a very small momentum spread. This leads to systematic misinterpretations of the measurements. Spectrometry and emittance measurements based on quadrupole scan rely on measuring the beam size, which depends on the beam envelope. This, in turn, depends on the momentum distribution. We have studied the systematic errors that arise and developed novel algorithms to correctly analyze these measurements for arbitrary momentum distributions. As an application we consider the CLIC drive beam decelerator, where extraction of up to 90% of the kinetic energy leads to a very large momentum spread. We study a measurement of the time-resolved momentum distribution, based on sweeping the beam in a circular pattern and recording the beam size on a screen using optical transition radiation. We present the algorithm to extract the time-resolved momentum distribution, together with simulation results to prove its applicability.  
slides icon Slides MOCL3 [2.984 MB]  
 
MOPC02 Status of Beam Diagnostics for NSLS-II Booster booster, controls, BPM, vacuum 41
 
  • V.V. Smaluk, E.A. Bekhtenev, S.E. Karnaev, G.V. Karpov, O.I. Meshkov
    BINP SB RAS, Novosibirsk, Russia
  • D. Padrazo, O. Singh, V.V. Smaluk, K. Vetter, G.M. Wang
    BNL, Upton, Long Island, New York, USA
  
  For the NSLS II third generation light source, a full-energy Booster ring has been designed and produced by Budker Institute of Nuclear Physics. For the Booster commissioning and operation, following beam diagnostic instruments have been designed and manufactured: 6 beam flags, 36 electrostatic pickups with BPM receivers, 2 synchrotron light monitors (SLMs), 1 DC current transformer, 1 fast current transformer, Tune Measurement System (TMS) including 2 strip-line assemblies. All the equipment has been installed in the Booster ring and Injector Service Area. Control software of the beam diagnostic devices has been developed and incorporated into the NSLS-II control system using the EPICS environment. A number of high-level applications has been developed using Control System Studio and Python. The Integrated Testing and the System Level Testing have been performed. Current status of the Booster beam diagnostic instrumentation is reviewed.  
 
MOPC03 Overview of the ESS-Bilbao Mobile Diagnostics Test Stand ESS, rfq, emittance, transverse 45
 
  • D. Belver, I. Arredondo, I. Bustinduy, P. Echevarria, J. Feuchtwanger, Z. Izaola, J. Ortega Mintegui, S. Varnasseri
    ESS Bilbao, Zamudio, Spain
  
  A MObile diagnostics Test Stand (MOTS) is being designed at ESS-Bilbao in order to characterize the beam at the end of the Radio Frequency Quadrupole (RFQ) at 3 MeV. Injection of the beam from the RFQ to the Drift Tube Linac (DTL) tank and acceleration up to 12 MeV is a sensitive operation in the accelerating chain. The output beam of the RFQ should be fully characterized and tuned to optimize this operation. To perform this characterization the MOTS is being designed with a set of diagnostics devices to measure also beam parameters after the Medium Energy Beam Transport (MEBT), and with minor modifications after the first tank of the DTL. The most important beam parameters that will be measured with the test stand are the beam current, the beam energy and the energy spread. Other important parameters are the beam emittance, the transverse beam position and the profile and bunch length. This contribution describes the beam properties that will be measured and the corresponding instrumentation devices, and presents a general layout of the MOTS.  
poster icon Poster MOPC03 [1.146 MB]  
 
MOPC04 Electron Beam Collimation for Slice Diagnostics and Generation of Femtosecond Soft X-Ray Pulses from a Free Electron Laser emittance, electron, collimation, FEL 49
 
  • S. Di Mitri, M. Bossi, D. Castronovo, I. Cudin, M. Ferianis, L. Fröhlich
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  
  We present the experimental results of femtosecond slicing an ultra-relativistic, high brightness electron beam with a collimator*. We demonstrate that the collimation process preserves the slice beam quality, in agreement with our theoretical expectations, and that the collimation is compatible with the operation of a linear accelerator. Thus, it turns out to be a more compact and cheaper solution for electron slice diagnostics than commonly used radiofrequency deflecting cavities and having minimal impact on the machine design. The collimated beam can also be used for the generation of stable femtosecond soft x-ray pulses of tunable duration from a free electron laser.
* S. Di Mitri et al., Phys. Rev. Special Topics - Accel. Beams 16, 042801 (2013). 		 
 
MOPC06 Beam Diagnostics System for a Photo-Neutron Source Driven by 15MeV Electron Linac electron, beam-position, linac, BPM 57
 
  • Y.B. Yan, J. Chen, Z.C. Chen, Y.B. Leng, L.Y. Yu, R.X. Yuan, W.M. Zhou
    SINAP, Shanghai, People's Republic of China
  
  A photo-neutron source driven by 15MeV electron LINAC is under construction at Shanghai Institute of Applied Physics (SINAP). Several kinds of beam monitors (BPM, Profile and ICT) have been installed. The stripline beam position monitor with eight electrodes was designed, also for energy spread measurement. Due to the multi-bunch operation mode, a custom RF front end was adopted, which down-converts the signal from 2856MHz to 500MHz and then brings it to Libera Single Pass E. The beam position monitor was based on the integrated step-servo motor and GigE Vision camera. For the beam charge measurement we used the ICT from Bergoz and scope from Agilent. The detail of the whole beam diagnostics system development will be reported in this paper.  
 
MOPC07 Design Considerations for a New Beam Diagnostics for Medical Electron Accelerators electron, transverse, controls, emittance 60
 
  • D. Vlad
    Siemens AG Healthcare, H CP CV - Components and Vacuum, Erlangen, Germany
  • M. Hänel
    Siemens Healthcare, Erlangen, Germany
  
  A new beam diagnostics system is under construction at the Siemens Healthcare Sector facility in Rudolstadt, Germany. The project goal is to develop, commission and operate a beam diagnostics system to characterize the compact medical linear electron accelerators and help improve the quality of their output beam. A brief system description together with the main electron beam parameters is given. The diagnostics will allow the characterization of the compact linear accelerators by measuring beam intensity/charge using a toroid, transverse beam profile using scintillating screens and transverse beam emittance by means of the quadrupole scan method. In the longitudinal plane the energy and energy spread will be determined using a spectrometer magnet.  
 
MOPC12 Development of the New Electronic Instrumentation for the LIPAc/IFMIF Beam Position Monitors BPM, beam-position, instrumentation, controls 71
 
  • A. Guirao, D. Jimenez, L.M. Martinez Fresno, J. Molla, I. Podadera
    CIEMAT, Madrid, Spain
  
  Funding: Work partially supported by the Spanish Ministry of Science and Innovation under project AIC10-A-000441 and AIC-A-2011-0654.
Among all the LIPAc/IFMIF accelerator diagnostics instrumentation, the Beam Position Monitors are a cornerstone for its operation. A new approach for the LIPAc/IFMIF beam position monitors acquisition electronics is proposed for the twenty BPM stations distributed along the accelerator. The new system under development is a fully digital instrumentation which incorporates automatic calibration of the monitors' signals and allows monitoring of both fundamental and second signal harmonics. The current state of the development and first experimental results of the system on the test bench will be presented. 		 
 
MOPC20 Application of Metal-Semiconductor-Metal (MSM) Photodetectors for Transverse and Longitudinal Intra-Bunch Beam Diagnostics synchrotron, BPM, CTF3, CERN 97
 
  • R.J. Steinhagen
    CERN, Geneva, Switzerland
  • M.J. Boland
    SLSA, Clayton, Australia
  • T.G. Lucas, R.P. Rassool
    The University of Melbourne, Melbourne, Australia
  • T.M. Mitsuhashi
    KEK, Ibaraki, Japan
  
  The performance reach of modern accelerators is often governed by the ability to reliably measure and control the beam stability. In high-brightness lepton and high-energy hadron accelerators the use of optical diagnostic techniques for this purpose is becoming more widespread as the required bandwidth, resolution and high RF beam power level involved limit the use of traditional electro-magnetic RF pick-up based methods. This contribution discusses the use of fibre-coupled ultra-fast Metal-Semiconductor-Metal Photodetectors (MSM-PD) as an alternative, dependable means to measure signals deriving from electro-optical and synchrotron-light based diagnostics systems. It describes the beam studies performed at CERN's CLIC Test Facility (CTF3) and the Australian Synchrotron to assess the feasibility of this technology as a robust, wide-band and sensitive technique for measuring transverse intra-bunch and bunch-by-bunch beam oscillations, longitudinal beam profiles, un-bunched beam population and beam-halo profiles. The used amplification schemes, achieved sensitivities, linearity, and dynamic range of the detector setup are presented.  
poster icon Poster MOPC20 [3.065 MB]  
 
MOPC24 Design Of The Stripline BPM For The Advanced Photoinjector Experiment BPM, impedance, simulation, coupling 108
 
  • S. De Santis, M.J. Chin, D. Filippetto, W.E. Norum, Z. Paret, G.J. Portmann, F. Sannibale, R.P. Wells
    LBNL, Berkeley, California, USA
  
  Funding: Work supported by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231
We describe the design, bench testing, and initial commissioning of the shorted striplines beam position monitors used in the Advanced Photoinjector Experiment (APEX) at Lawrence Berkeley National Laboratory. Our BPM's are characterized by extreme compactness, being designed to fit in the vacuum chamber of the quadrupole magnets, with only a short portion including the RF feedthroughs occupying additional beam pipe length. In this paper we illustrate the design process, which included extensive 3D computer simulations, the bench testing of prototype and final components, and the first measurements with beam. The readout electronics is also described. 		 
 
MOPF02 The Wire Scanner Control Sytem for C-ADS Injector-II controls, emittance, feedback, linac 197
 
  • M. Li, X.C. Kang, R.S. Mao, J.X. Wu, Y.J. Yuan, J. Zhang, Y. Zhang, G. Zhu
    IMP, Lanzhou, People's Republic of China
  
  The C-ADS project is a strategic plan to solve the nuclear waste problem and the resource problem for nuclear power plants in China. The first step of this project is to build two 5-MeV test CW linac. The institute of Modern physics (IMP) is in charge of designing one of them. In order to measure the beam profile in this linac, a wire scanner system was designed and tested. In this paper, the mechanical design and control system of this wire scanner system are introduced. A real-time, closed loop control system is being developed and tested for more repeatable and accurate positioning of beam sense wires. All of the electronic and computational duties are handled in one the National Instruments compact RIO real-time chassis with a Field-Programmable Gate Array (FPGA). The beam test result of this system in IMP 320 KV beam line was present. The test result of this system and the measured beam profile result are discussed in this paper.  
 
MOPF06 Beam Profile Monitors at REGAE electron, photon, optics, SNR 212
 
  • H. Delsim-Hashemi, K. Flöttmann
    DESY, Hamburg, Germany
  • S. Bayesteh
    Uni HH, Hamburg, Germany
  
  A new linac is commissioned at DESY mainly as the electron source for femtosecond electron diffraction facility REGAE (Relativistic Electron Gun for Atomic Exploration). REGAE enables studies on structural dynamics of atomic transition states occurring in the sub-hundred femtosecond time-scale. REGAE comprises a photo-cathode gun followed by normal conducting 1.5 cell rf-cavity to provide sub pC electron-bunches of 2-5 MeV with a coherence length of 30nm. In order to produce and maintain such electron bunches, sophisticated single-shot diagnostics are desired e.g. emittance, energy, energy-spread and bunch-length measurement. REGAE rep-rate can be up to 50 Hz. This relatively high rep-rate makes it more challenging to deal with low intensity detection especially in single-shot mode. In this contribution the conceptual ideas, realization and results of transversal diagnostics will be presented.  
 
MOPF27 A Beam Current Monitor for the VECC Accelerator linac, gun, vacuum, radiation 275
 
  • W.R. Rawnsley, R.E. Laxdal
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  
  TRIUMF is building VECC, the first stage of a 50 MeV electron linac. Beam diagnostic devices will be inserted radially into 8-port vacuum boxes. RF shields, 6.3 cm dia. tubes perforated by pump out slots, can be inserted to reduce wakefields. They will also serve as capacitive probes picking up harmonics of the 650 MHz bunch rate. 100 mV P/P was measured for 3 mA at 100 kV. A SC cavity will accelerate the beam to 10 MeV. The dump current is limited by the shielding to 300 W. We will use a 3 mA beam at 1% duty cycle. Two RF shields will monitor the current. A newly developed circuit will give dc outputs proportional to the peak and average current. It uses a log detector with range of 70 dB for 1 dB of error and a rise and fall time of ~20 ns. Terasic development boards process the log signal. It is digitized by a 14-bit ADC at a 50 MHz rate and passed to a FPGA programmed in Verilog. Altera Megafunctions offset, scale, convert to floating point, antilog and filter the signal in a pipeline architecture. Two 14-bit DACs provide the outputs. Digital processing maintains the wide dynamic range. Beam pulses can be <250 ns and the sample rate insures accuracy at low duty cycle.  
poster icon Poster MOPF27 [1.314 MB]  
 
MOPF30 Novel Diagnostics for Breakdown Studies electron, CLIC, simulation, klystron 287
 
  • M. Jacewicz, Ch. Borgmann, M. Olvegård, R.J.M.Y. Ruber, V.G. Ziemann
    Uppsala University, Uppsala, Sweden
  • J.W. Kovermann
    CERN, Geneva, Switzerland
  
  The phenomenon that currently prevents achieving high accelerating gradients in high energy accelerators such as the CLIC linear collider is electrical breakdown at very high electrical field. The ongoing experimental work is trying to benchmark the theoretical models focusing on the physics of vacuum breakdown which is responsible for the discharges. The CLIC collaboration has commissioned a dedicated 12 GHz test-stand to validate the feasibility of accelerating structures and observe the characteristics of the RF discharges and their eroding effects on the structure. A versatile system for detection of the dark and breakdown currents and light emission is being developed for the test-stand. It consists of a collimation system with an external magnetic spectrometer for measurement of the spatial and energy distributions of the electrons emitted from the acceleration structure during a single RF pulse. These measurements can be correlated with e.g. the location of the breakdown inside the structure using information from the incident, reflected and transmitted RF powers giving a complete picture of the vacuum breakdown phenomenon.  
 
TUPC01 Overview of the European Spallation Source Warm Linac Beam Instrumentation linac, ESS, emittance, ion 346
 
  • B. Cheymol, C. Böhme, I. Dolenc Kittelmann, H. Hassanzadegan, A. Jansson, T.J. Shea, L. Tchelidze
    ESS, Lund, Sweden
  
  The normal conducting front end of the European Spallation source will accelerate the beam coming for the ion source up to 90 MeV. The ESS front end will consist in an ion source, a low energy beam transport line, a radio frequency quadrupole, a medium energy beam transport line and a drift tube linac. The warm linac will be equipped with beam diagnostics to measure the beam position, the transverse and longitudinal profile as well as beam current and beam losses. This will provide efficient operation of ESS, and ensure keeping the losses at a low level. This paper gives an overview of the beam diagnostics design and their main features.  
 
TUPC06 Status of Beam Diagnostic Systems for TRIUMF Electron Linac BPM, target, electron, linac 361
 
  • V.A. Verzilov, P.S. Birney, D.P. Cameron, P. Dirksen, J.V. Holek, S.Y. Kajioka, S. Kellogg, M. Lenckowski, M. Minato, W.R. Rawnsley
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
  • J.M. Abernathy, D. Karlen, D.W. Storey
    Victoria University, Victoria, B.C., Canada
  
  TRIUMF laboratory is currently in a phase of the construction of a superconducting 50 MeV 10 mA cw electron LINAC to drive photo-fission based rare radioactive isotope beam (RIB) production. The project imposes certain technical challenges on various accelerator systems including beam diagnostics. In the first place these are a high beam power and strongly varying operating modes ranging from microsecond beam pulses to the cw regime. Diagnostics development interleaves with the construction of the diagnostics instrumentation required for the test facility which delivered the first beam in Fall of 2011. The paper reports the present status of various diagnostics systems along with measurement results obtained at the test facility.  
 
TUPC41 A Femtosecond Resolution Electro-Optic Diagnostic Using a Nanosecond-Pulse Laser laser, CLIC, alignment, longitudinal 474
 
  • S.P. Jamison
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • W.A. Gillespie, D.A. Walsh
    University of Dundee, Nethergate, Dundee, Scotland, United Kingdom
  
  Funding: We gratefully acknowledge support under CERN collaboration agreement KE1865/TE
Electro-optic longitudinal profile diagnostic systems with intrinsically improved reliability and a time resolution of 20 fs rms are being developed for CLIC. Exploiting the electro-optic effect, the bunch electric field 'pulse carves' an optical replica from a narrow bandwidth nanosecond duration laser probe. All-optical characterisation of the optical replica is via spectrally resolved auto-correlation, providing a sub-20fs resolution capability. An optical parametric amplification stage following the pulse carving, and driven by same nanosecond laser that provides the probe, enables sufficient intensity for single-shot measurement. In basing the optical system on nanosecond Q-switched lasers, bypassing complex femtosecond laser systems, the potential for robust instrumentation development is enhanced. The bandwidth limitations of the electro-optic materials are being addressed through investigations into multiple crystal detectors, and THz induced second harmonic generation on metal surfaces. Experimental results on the optical subsystems, using laser-produced THz as an electron bunch mimic, are presented together with performance projections for the integrated system. 		 
 
TUPC43 Bunch Length Measurement With Streak Camera At SSRF Storage Ring electron, longitudinal, storage-ring, synchrotron 478
 
  • J. Chen, Z.C. Chen, Y.B. Leng, K.R. Ye, R.X. Yuan
    SINAP, Shanghai, People's Republic of China
  
  A streak camera is installed to measure the bunch length of storage ring at SSRF. The principle, structure, configuration and error analysis of the measurement is introduced. Some result of the measurement are analysed to explain the physical meaning of beam status. The system is used in daily operation and machine study at SSRF.  
 
TUPF05 Particle Tracking for the FETS Laser Wire Emittance Scanner laser, dipole, simulation, emittance 503
 
  • J.K. Pozimski
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • S.M. Gibson
    Royal Holloway, University of London, Surrey, United Kingdom
  
  The Front End Test Stand (FETS) is an R&D project at Rutherford Appleton Laboratory (RAL) with the aim to demonstrate a high power (60 mA, 3 MeV with 50 pps and 10 % duty cycle), fast chopped H− ion beam. The diagnostics of high power particle beams is difficult due to the power deposition on diagnostics elements introduced in the beam so non-invasive instrumentation is highly desirable. The laser wire emittance scanner under construction is based on a photo-detachment process utilizing the neutralized particles produced in the interaction between Laser and H− beam for beam diagnostics purposes. The principle is appropriate to determine the transversal beam density distribution as well as the transversal and longitudinal beam emittance behind the RFQ. The instrument will be located at the end of the MEBT with the detachment taking place inside a dipole field. Extensive particle tracking simulations have been performed for various settings of the MEBT quadrupoles to investigate the best placement and size of the 2D scintillating detector and to determine the range and resolution of the instrument. Additionally the power distribution in the following beam dumps has been determined.  
 
TUPF14 Description of Laser Transport and Delivery System for the FETS Laserwire Emittance Scanner laser, coupling, emittance, focusing 527
 
  • A. Bosco, G.E. Boorman, S. Emery, S.M. Gibson
    Royal Holloway, University of London, Surrey, United Kingdom
  • C. Gabor
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  • T. Hofmann
    CERN, Geneva, Switzerland
  • A.P. Letchford
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  • J.K. Pozimski, P. Savage
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  
  A beam emittance monitor for H− beams based on laser-induced ions neutralization is being developed at the Front End Test Stand (FETS) at the Rutherford Appleton Laboratory (RAL). The laser system that will be used for the photo-neutralization of the H− beam is a fiber laser emitting 110 ns pulses at λ=1064nm, with a repetition rate of 30 kHz and peak power of 8 kW. The laser will be conveyed to the interaction area over a distance of 70 m via an optical fiber. An assembly of two remotely controlled motorized translation stages will enable the system to scan across the H− beam along its vertical profile. A motorized beam expander will control the output size of the collimated laser beam in order to enable the system to operate with different spatial characteristics of the ions beam. In this paper we present a full account of the laser characteristics, the optical transport system and the final delivery assembly. All the relevant measurements such as power, spatial and temporal characteristics of the laser, fiber transport efficiency and final delivery laser beam parameters will be reported.  
poster icon Poster TUPF14 [4.081 MB]  
 
TUPF24 Instrumentation for the Proposed Low Energy RHIC Electron Cooling Project electron, ion, RHIC, emittance 561
 
  • D.M. Gassner, A.V. Fedotov, D. Kayran, V. Litvinenko, R.J. Michnoff, T.A. Miller, M.G. Minty, I. Pinayev, M. Wilinski
    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
There is a strong interest in running RHIC at low ion beam energies of 2.5-20GeV/nucleon; this is much lower than the typical operations with 100GeV/nucleon. The primary motivation for this effort is to explore the existence and location of the critical point on the QCD phase diagram. Electron cooling can increase the average integrated luminosity and increase the length of the stored lifetime. Simulations and conceptual cooling sub-system designs are underway. The present plan is to provide 10–50mA of bunched electron beam with adequate quality and an energy range of 0.9–5MeV. The preliminary cooling facility configuration planned to be fully inside the RHIC tunnel will include a 102.74MHz SRF gun, a booster cavity, a beam transport to the Blue ring to allow electron-ion co-propagation for ~10-20m, then a 180 degree u-turn electron transport so the same electron beam can similarly cool the Yellow ion beam, then to a dump. The electron beam instrumentation systems that will be described include current transformers, BPMs, profile monitors, a pepper pot emittance station and loss monitors. 		 
poster icon Poster TUPF24 [1.588 MB]  
 
TUPF26 Laser-Based Beam Instrumentation R&D within LA3NET laser, electron, target, acceleration 567
 
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  
  Funding: LA³NET is funded by the European Commission under Grant Agreement Number 289191.
Within LA3NET, Laser Applications for Accelerators are being developed by an international NETwork of more than 30 partner institutions from across the world. Laser-based beam instrumentation is at the core of this EU-funded project which will train 17 fellows during its four year project duration. In this contribution, we will present the consortium's recent research results in beam diagnostics, ranging from development of a laser velocimeter and laser emittance meter, over measurement of the bunch shape with electro-optical sampling in an electron accelerator and precision determination of electron beam energy with Compton backscattered laser photons to measurement of electron bunches with a time resolution of better than 20 femtoseconds. We will also provide a summary of past training events organized by the consortium and give an overview of future workshops, conferences and schools. 		 
 
TUPF27 An Ultra Low-Noise AC Beam Transformer and Digital Signal Processing System for CERN’s ELENA Ring CERN, pick-up, longitudinal, extraction 571
 
  • M.E. Angoletta, C. Carli, F. Caspers, S. Federmann, J.C. Molendijk, F. Pedersen, J. Sanchez-Quesada
    CERN, Geneva, Switzerland
  
  CERN’s Extra Low ENergy Antiproton (ELENA) Ring is a new synchrotron that will be commissioned in 2016 to further decelerate the antiprotons coming from CERN’s Antiproton Decelerator. Essential longitudinal diagnostics required for commissioning and operation include the intensity measurement for bunched and debunched beams and the measurement of Dp/p for debunched beams to assess the electron cooling performance. The beam phase information is also needed by the low-level RF system. The baseline system for providing the required beam parameters and signals is based upon two ultra-low-noise AC beam transformers and associated digital signal processing. The AC beam transformers cover different frequency regions and are an adaptation to the ELENA layout of those used in the AD. Two AC beam transformers will also be installed in the extraction lines to provide beam intensity and bunch shape measurements. The digital signal processing will be carried out with the leading-edge hardware family used for ELENA’s low-level RF system. The paper provides an overview of the beam transformer and head amplifier, as well as of the associated digital signal processing.  
 
TUPF28 A Leading-Edge Hardware Family for Diagnostics Applications and Low-Level RF in CERN’s ELENA Ring CERN, controls, antiproton, synchrotron 575
 
  • M.E. Angoletta, A. Blas, M. Jaussi, P.M. Leinonen, T.E. Levens, J.C. Molendijk, J. Sanchez-Quesada, J. Simonin
    CERN, Geneva, Switzerland
  
  The CERN Extra Low ENergy Antiproton (ELENA) Ring is a new synchrotron that will be commissioned in 2016 to further decelerate the antiprotons transferred from the CERN’s Antiproton Decelerator (AD). The requirements for the acquisition and treatment of signals for longitudinal diagnostics are very demanding, owing to the revolution frequency swing as well as to the digital signal processing required. The requirements for the Low-Level RF (LLRF) system are very demanding as well, especially in terms of revolution frequency swing, dynamic range and low noise required by the cavity voltage control and digital signal processing to be performed. Both sets of requirements will be satisfied by using a leading-edge hardware family, developed to cover the LLRF needs of all synchrotrons in the Meyrin site; it will be first deployed in 2014 in the CERN’s PSB and in the medical machine MedAustron. This paper gives an overview of the main building blocks of the hardware family and of the associated firmware and IP cores. The performance of some blocks will also be detailed.  
 
TUPF31 Intensity Control in GANIL’s Experimental Rooms controls, simulation, instrumentation, pick-up 587
 
  • C. Courtois, C. Doutresssoulles, B. Ducoudret, C. Jamet, W. Le Coz, G. Ledu, C. Potier de courcy
    GANIL, Caen, France
  
  The safety re-examination of existing GANIL facilities requires the implementation of a safety system which makes a control of beam intensities sent in the experimental rooms possible. The aim is to demonstrate that beam intensities are below the authorized limits. The required characteristics should enable the measurement, by a non-interceptive method, of beam intensities from 5 nA to 5μA with a maximum uncertainty of 5%, independently of the frequency and the beam energy. After a comparative study, two types of high frequency diagnostics were selected, the capacitive peak-up and the Fast current transformer. This paper presents the signal simulations from diagnostics with different beam energies, the uncertainty calculations and the results of the first tests with beam.  
poster icon Poster TUPF31 [2.086 MB]  
 
WEAL1 Large Aperture X-ray Monitors for Beam Profile Diagnostics optics, photon, emittance, undulator 608
 
  • C.A. Thomas, G. Rehm
    Diamond, Oxfordshire, United Kingdom
  • F. Ewald
    ESRF, Grenoble, France
  • J.W. Flanagan
    KEK, Ibaraki, Japan
  
  Emittance is one of the main characteristic properties of a beam of particles in an accelerator, and it is measured generally by means of the particle beam profile. In particular, when the beam of particles is emitting an X-ray photon beam, a non perturbative way of measuring the particle beam profile is to image it using the emitted X-ray photon beam. Over the years, numerous X-ray imaging methods have been developed, fulfilling the requirements imposed by a particle beam becoming smaller, and approaching micron size for electron beam machine with vertical emittance of the order of 1pm-rad. In this paper, we will first recall the properties of the X-ray photon as function of source and its properties. From this we will derive some natural definition of a large aperture X-ray imaging system. We will then use this selection criterion to select a number of X-ray imaging devices used as a beam profile diagnostics in an attempt to give an overview of what has been achieved and what is possible to achieve with the selected devices.  
slides icon Slides WEAL1 [7.499 MB]  
 
WEPC02 Project PROMETHEUS: Design and Construction of a Radio Frequency Quadrupole at TAEK rfq, ion, ion-source, quadrupole 652
 
  • G. Turemen, B. Yasatekin
    Ankara University, Faculty of Sciences, Ankara, Turkey
  • Y. Akgun, A. Alacakir, A.S. Bolukdemir, E. Durukan, H. Karadeniz, E. Recepoğlu
    TAEK, Ankara, Turkey
  • E. Cavlan
    TOBB ETU, Ankara, Turkey
  • M. Celik, Z. Sali
    Gazi University, Faculty of Arts and Sciences, Teknikokullar, Ankara, Turkey
  • S. Erhan
    UCLA, Los Angeles, California, USA
  • Ö. Mete
    UMAN, Manchester, United Kingdom
  • G. Unel
    UCI, Irvine, California, USA
  
  The PROMETHEUS Project is ongoing for the design and development of a 4-vane radio frequency quadrupole (RFQ) with its H+ ion source, a low energy beam transport (LEBT) line and diagnostics section. The main goal of the project is to achieve the acceleration of the low energy ions up to 1.5 MeV by an RFQ (352 MHz) shorter than 2 m. A plasma ion source is being developed to produce a 20 keV, 1 mA H+ beam. Ion source, transmission and beam dynamics in the RFQ are discussed through simulation results. In addition, analytical studies were also performed resulting into an RFQ design code, DEMIRCI as discussed and presented here in comparison with various existing software. As a result of the simulations, beam transmission of 99% was achieved at 1.7 m downstream reaching energy of 1.5 MeV. As the first phase an Aluminum RFQ prototype, the so-called cold model, will be built for low power RF characterization. In this contribution the status of the project, design considerations, simulation results, the various diagnostics techniques and RFQ fabrication issues are discussed.  
poster icon Poster WEPC02 [25.664 MB]  
 
WEPC03 Brookhaven 200 MeV Linear Accelerator Beam Instrumentation Upgrade linac, instrumentation, vacuum, radiation 656
 
  • O. Gould, B. Briscoe, D.M. Gassner, V. LoDestro, R.J. Michnoff, J. Morris, D. Raparia, K. Sanders, W. Shaffer, C. Theisen, M. Wilinski
    BNL, Upton, Long Island, New York, USA
  • D. Persaud
    City College of The City University of New York, New York, USA
  
  The Brookhaven National Laboratory 200 MeV H− LINAC beam instrumentation equipment has been in operation for four decades with various changes implemented over this period. There is a need to upgrade the entire beam instrumentation system of the LINAC to improve the diagnostics of the beam from the Low Energy Beam Transport Line through the LINAC and into the LINAC Booster Transfer Line and BLIP line. Profile Monitors, Current Monitors, Beam Position Monitors, Loss Radiation Monitors, and Emittance Measurement devices are to be designed and implemented over the next three years. This upgrade will improve the operation reliability, beam quality and beam losses. Additional improvements will be obtained by designing the beam instrumentation system to integrate with other proposed diagnostics and malfunction detection and display upgrades in the LINAC Control Room to improve the overall performance of the LINAC.  
poster icon Poster WEPC03 [18.356 MB]  
 
WEPC04 Beam Diagnostics for Commissioning and Operation of a Novel Compact Cyclotron for Radioisotope Production cyclotron, ion, ion-source, target 660
 
  • I. Podadera, B. Ahedo, P. Arce, L. García-Tabarés, D. Gavela, A. Guirao, J.I. Lagares, L.M. Martinez, D. Obradors-Campos, C. Oliver, J.M. Perez Morales, F. Sansaloni, F. Toral
    CIEMAT, Madrid, Spain
  
  Funding: Work partially funded by the CDTI and supported by the Spanish Ministry of Science and Innovation under project AMIT, within the subprogramme CENIT-2009.
The AMIT cyclotron will be a 8.5 MeV, 10 μA CW H− accelerator which aims to deliver a beam for radioisotope production. In order to properly validate all the beam commissioning steps, a set of diagnostics needs to be implemented. They must cover all the commissioning phases: ion source characterization, medium energy acceleration and nominal energy at full current. Due to compactness of the design, the number of beam diagnostics is limited and restricted to the most essential ones during operation. An overview of the diagnostics that are planned for the characterization of the cyclotron will be discussed in this contribution. In all the commissioning phases, beam current probes are essential to validate the cyclotron and each subsystem. As a main diagnostic, a moveable probe has been designed and simulated for optimization of the cyclotron. The thermal simulations of the probe and the mechanical integration will be presented. 		 
 
WEPC20 Bunch Extension Monitor for LINAC of SPIRAL2 facility linac, ion, MCP, photon 720
 
  • R.V. Revenko, J.L. Vignet
    GANIL, Caen, France
  
  Funding: This work is funded in frame of CRISP project.
Measurements of the bunch longitudinal shape of beam particles are crucial for optimization and control of the LINAC beam parameters and maximization of its integrated luminosity. The non-interceptive bunch extension monitor for LINAC of SPIRAL2 facility is being developed at GANIL. The five bunch extension monitors are to be installed on the entrance of LINAC between superconducting cavities. The principle of monitor operation is based on registration of x-rays induced by ions of accelerator beam and emitted from thin tungsten wire. The monitor consists of two parts: system for wire insertion and positioning and x-ray detector based on microchannel plates. The prototype of detector has been developed and was tested using protons and heavy ions beams. 		 
poster icon Poster WEPC20 [9.366 MB]  
 
WEPC31 New Design of the 40 GHz Bunch Arrival Time Monitor Using MTCA.4 Electronics at FLASH and for the European XFEL laser, XFEL, pick-up, DESY 749
 
  • M.K. Czwalinna, C. Gerth, H. Schlarb
    DESY, Hamburg, Germany
  • S. Bou Habib
    Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
  • S. Korolczuk, J. Szewiński
    NCBJ, Świerk/Otwock, Poland
  • A. Kuhl
    Uni HH, Hamburg, Germany
  
  At free-electron lasers, today's pump-probe experiments and seeding schemes make high demands on the electron bunch timing stability with an arrival time jitter reduction down to the femtosecond level. At FLASH and the upcoming European XFEL, the bunch train structures with their high bunch repetition rates allow for an accurate intra-train stabilisation. To realise longitudinal beam-based feedbacks a reliable and precise arrival time detection over a broad range of bunch charges, which can even change from 1 nC down to 20 pC within a bunch train, is essential. Benefitting from the experience at FLASH, the current bunch arrival time monitors (BAMs), based on detection of RF signals from broad-band pick-ups by use of electro-optic modulators, are further developed to cope with the increased requirements. In this paper, we present the new BAM prototype, including an adapted electro-optical front-end and the latest development of the read-out electronics based on the MTCA.4 platform.  
 
WEPF10 Wire Scanner Design for the European Spallation Source linac, ESS, proton, CERN 830
 
  • B. Cheymol, A. Jansson, T.J. Shea
    ESS, Lund, Sweden
  
  The European Spallation Source (ESS), to be built in the south of Sweden, will use a 2 GeV superconducting LINAC to produce the world's most powerful neutron source with a beam power of 5 MW. The beam power is a challenge for interceptive beam diagnostics like wire scanner, the thermal load on intercepting devices implies to reduce the beam power in order to preserve the device integrity. For nominal operation, non-disturbing techniques for profile measurements are planned, while for the commissioning phase, accurate measurements and cross checking, wire scanners will be used. This paper describes the preliminary design of the wire scanner system in the normal conducing LINAC as well as in the superconducting LINAC.  
 
WEPF22 Non Invasive Optical Synchrotron Radiation Monitor Using a Mini-Chicane emittance, electron, radiation, space-charge 860
 
  • R.B. Fiorito, R.A. Kishek, A.G. Shkvarunets
    UMD, College Park, Maryland, USA
  • D. Castronovo, M. Cornacchia, S. Di Mitri, M. Veronese
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • C. Tschalär
    MIT, Middleton, Massachusetts, USA
  
  Funding: Office of Naval Research and DOD Joint Technology Office
We are developing a design for a minimally perturbing mini-chicane which utilizes the optical synchrotron radiation (OSR) generated from magnetic bends to measure the rms emittance and other optical parameters of the beam. The beam is first externally focused at the first bend and the OSR generated there is used to image the beam. Subsequently, any pair of bends produces interferences (OSRI) whose visibility can used to determine the beam divergence. The properties of different configuration of bends in the chicane have been analyzed to provide an optimum diagnostic design for a given set of beam parameters which: 1) provides a sufficient number of OSRI fringes to allow a measurement of the beam divergence; 2) minimizes the competing effect of energy spread on the fringe visibility; 3) minimizes the effect of coherent synchrotron radiation and space charge on the beam emittance; and 4) minimizes the effect of compression on the bunch length, as the beam passes through the chicane. Diagnostic designs have been produced for 100-300 MeV beams with a normalized rms emittance of about 1 micron for application to Fermi@Elettra and similar high brightness free electron lasers. 		 
poster icon Poster WEPF22 [0.642 MB]  
 
WEPF23 Beam Diagnostics R&D within oPAC radiation, OTR, transverse, simulation 864
 
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  
  Funding: oPAC is funded by the European Commission under Grant Agreement Number 289485.
Optimization of particle accelerators by combining research into beam physics, beam instrumentation, accelerator control systems and numerical simulation studies is the goal of the oPAC project. Supported with 6 Million Euros by the European Union, the network is one of the largest-ever Initial Training Networks. During the project's four year duration 22 fellows will be trained and a very broad international training program, consisting of schools, topical workshops and conferences will be organized by a consortium of currently more than 30 partner institutions. In this contribution, we will give an overview of oPAC's broad beam diagnostics R&D program, comprising absolute beam intensity measurements for low energy beams, beam diagnostics for synchrotron light sources, cyrogenic beam loss monitors, beam halo monitoring and 3D dose measurements as part of intensity modulated radiotherapy treatment. We will also summarize past oPAC events and give an outlook on future events. 		 
 
WEPF24 Charge Monitors at the Relativistic Electron Gun for Atomic Exploration – REGAE electron, laser, DESY, gun 868
 
  • H. Delsim-Hashemi, K. Flöttmann, M. Seebach
    DESY, Hamburg, Germany
  • S. Bayesteh
    Uni HH, Hamburg, Germany
  
  A new linac is commissioned at DESY mainly as the electron source for femtosecond electron diffraction facility REGAE (Relativistic Electron Gun for Atomic Exploration). REGAE comprises a photo-cathode gun followed by normal conducting 1.5 cell rf-cavity to provide sub pC charge electron-bunches of 2-5 MeV with a coherence length of 30nm. In order to produce and maintain such electron bunches, sophisticated single-shot diagnostics are desired e.g. emittance, energy, energy-spread and bunch-length measurement. There are three methods at REGAE for charge measurement. The most routine method is based on Faraday-cups that are distributed along machine and can provide charge reading down to ~50 fC. The second method, which is non-destructive, is a cavity based antenna that measures beam induced fields. A third method is based on beam-profile measurement diagnostics. By proper calibration of integral intensity that arrives at detector one can measure charges down to fC level. The last method has the potential to reach the limit of few electrons charge when state-of-the-art intensifiers are used in profile monitors.  
 
WEPF26 Test Bench Experiments for Energy Measurement and Beam Loss of ESS-Bilbao beam-losses, rfq, ion, ESS 876
 
  • S. Varnasseri, I. Arredondo, D. Belver, P. Echevarria, M. Eguiraun
    ESS Bilbao, Zamudio, Spain
  
  Various test benches have been developed at ESS-Bilbao in order to characterize different beam diagnostics and control systems prior to their installation on various parts of the accelerator. One test bench includes time-of-flight (TOF) characterization for energy measurement using fast current transformers (FCT). Using FCTs for the TOF measurement would allow us to measure accurately the delay between two successive bunched or un-bunched beam pulses of low energy ions. The other test bench includes a beam loss monitoring and interlock system using ACCTs, cRIO and PXI chassis with some acquisition modules and optical fiber link which represent a complete system of beam loss detection, interlock logic and trigger signal transmission. Having an integration on the ACCT output also allows us to measure the beam charge at the location of monitoring. In the test benches the functionality of hardware and software, the logic and required signal specifications like rise time, jitters and delays are measured. An overview of test benches and their measurement results are reported in this paper.  
poster icon Poster WEPF26 [1.120 MB]  
 
WEPF28 Longitudinal Beam Diagnostic from a Distributed Electrostatic Pick-Up in CERN’s ELENA Ring longitudinal, CERN, pick-up, antiproton 883
 
  • M.E. Angoletta, F. Caspers, S. Federmann, J.C. Molendijk, P.J. Pascal Jean, F. Pedersen, J. Sanchez-Quesada, L. Søby, M.A. Timmins
    CERN, Geneva, Switzerland
  
  The CERN Extra Low ENergy Antiproton (ELENA) Ring is a new synchrotron that will be commissioned in 2016 to further decelerate the antiprotons coming from CERN’s Antiproton Decelerator (AD). Required longitudinal diagnostics include the intensity measurement for bunched and debunched beam and the measurement of Dp/p for a debunched beam to assess the electron cooling performance. A novel method for the calculation of these parameters is proposed for ELENA, where signals from the twenty electrostatic pick-ups (PU) used for orbit measurements will be combined to improve the signal-to-noise ratio. This requires that the signals be digitally down-converted, rotated and digitally summed so that the many electrostatic PUs will function as a single, distributed PU from to the processing system viewpoint. This method includes some challenges and will not be used as the baseline longitudinal diagnostics for the initial ELENA operation. This paper gives an overview of the hardware and digital signal processing involved, as well as of the challenges that will have to be faced.  
 
THBL2 The White Rabbit Project controls, CERN, CDR, radio-frequency 936
 
  • J. Serrano, M. Cattin, G. Daniluk, E. Gousiou, M.M. Lipiński, E. Van der Bij, T. Włostowski
    CERN, Geneva, Switzerland
  
  White Rabbit (WR) is a multi-laboratory, multi-company collaboration for the development of a new Ethernet-based technology which ensures sub-nanosecond synchronisation and deterministic data transfer. The project uses an open source paradigm for the development of its hardware, gateware and software components. This article provides an introduction to the technical choices and an explanation of the basic principles underlying WR. It then describes some possible applications and the current status of the project. Finally, it provides insight on current developments and future plans.  
slides icon Slides THBL2 [5.516 MB]