4. Beam position monitors
Paper Title Page
TUOB03 Demonstration of a Newly Developed Pulse-by-pulse X-Ray Beam Position Monitor in SPring-8 182
 
  • H. Aoyagi, Y. Furukawa, S. Takahashi, A. Watanabe
    JASRI/SPring-8, Hyogo, Japan
 
  Funding: This work was partly supported by Japan Society for the Promotion of Science through a Grant-in-Aid for Scientific Research (c), No. 20416374 and No. 18K11943.
A newly designed pulse-by-pulse X-ray beam position monitor (XBPM), which is photoemission type, has been demonstrated successfully in the SPring-8 synchrotron radiation beamline. Conventional XBPMs work in the direct-current (DC) mode, because it is difficult to measure a beam position in the pulse mode under the sever heat load condition. The key point of the design is aiming at improving heat-resistance property without degradation of high frequency property [1]. This monitor is equipped with microstripline structure for signal transmission line to achieve pulse-by-pulse beam position signal. A photocathode is titanium electrode that is sputtered on a diamond heat sink to achieve high heat resistance. We have manufactured the prototype, and demonstrated feasibility at the SPring-8 bending magnet beamline. As a result, we observed a unipolar single pulse with the pulse length of less than 1 ns FWHM and confirmed that it has pulse-by-pules position sensitivity [2]. Furthermore, this monitor can be also used in the direct-current mode with good stability and good resolution. The operational experience will be also presented.
[1] http://accelconf.web.cern.ch/AccelConf/medsi2016/papers/wepe10.pdf
[2] http://www.pasj.jp/webpublish/pasj2017/proceedings/PDF/THOM/THOM06.pdf
 
slides icon Slides TUOB03 [2.380 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUOB03  
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TUOB04 A Vertical Phase Space Beam Position and Emittance Monitor for Synchrotron Radiation 186
 
  • N. Samadi
    University of Saskatchewan, Saskatoon, Canada
  • L.D. Chapman, L.O. Dallin
    CLS, Saskatoon, Saskatchewan, Canada
 
  We report on a system (ps-BPM) that can measure the electron source position and angular motion at a single location in a synchrotron bend magnet beamline using a combination of a monochromator and an absorber with a K-edge to which the monochromator was tuned in energy. The vertical distribution of the beam was visualized with an imaging detector where horizontally one part of the beam was with the absorber and the other part with no absorber. The small range of angles from the source onto the monochromator crystals creates an energy range that allows part of the beam to be below the K-edge and the other part above. Measurement of the beam vertical location without the absorber and edge vertical location with the absorber gives the source position and angle. Measurements were made to investigate the possibility of using the ps-BPM to correct experimental imaging data. We have introduced periodic electron beam motion using a correction coil in the storage ring lattice. The measured and predicted motions compared well for two different frequencies. We then show that measurement of the beam width and edge width gives information about the vertical electron source size and angular distribution.
[1] A phase-space beam position monitor for synchrotron radiation. J Synchrotron Radiat, 2015. 22(4): p. 946-55.
 
slides icon Slides TUOB04 [9.532 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUOB04  
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TUOC01 Integration of a Pilot-Tone Based BPM System Within the Global Orbit Feedback Environment of Elettra 190
 
  • G. Brajnik, S. Bassanese, G. Cautero, S. Cleva, R. De Monte
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
 
  In this contribution, we describe the advantages of the pilot tone compensation technique that we implemented in a new BPM prototype for Elettra 2.0. Injecting a fixed reference tone upstream of cables allows for a continuous calibration of the system, compensating the different behaviour of every channel due to thermal drifts, variations of cable properties, mismatches and tolerances of components. The system ran successfully as a drop-in substitute for a Libera Electron not only during various machine shifts, but also during a user dedicated beamtime shift for more than 10 hours, behaving in a transparent way for all the control systems and users. The equivalent RMS noise (at 10 kHz data rate) for the pilot tone position was less than 200 nm on a 19 mm vacuum chamber radius, with a long-term stability better than 1 um in a 12-hour window. Two main steps led to this important result: firstly, the development of a novel RF front end that adds the pilot tone to the signals originated by the beam, secondly, the realisation of an FPGA-based double digital receiver that demodulates both beam and pilot amplitudes, calculating the compensated X and Y positions.  
slides icon Slides TUOC01 [6.468 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUOC01  
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TUOC03 Commissioning of the Open Source Sirius BPM Electronics 196
 
  • S.R. Marques, G.B.M. Bruno, L.M. Russo, H.A. Silva, D.O. Tavares
    LNLS, Campinas, Brazil
 
  The new Brazilian 4th generation light source, Sirius, have already started and commissioning is planned to start in 2018. This paper will report on the manufacturing, deployment and production batch testing of the in-house developed BPM electronics. The latest performance and reliability achievements will be presented.  
slides icon Slides TUOC03 [14.606 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUOC03  
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TUOC04 Development of Beam Position Monitor for the SPring-8 Upgrade 204
 
  • H. Maesaka
    RIKEN SPring-8 Center, Innovative Light Sources Division, Hyogo, Japan
  • H. Dewa, T. Fujita, M. Masaki, S. Takano
    JASRI, Hyogo, Japan
 
  We are developing a new electron beam position monitor (BPM) system for the low-emittance upgrade of SPring-8. The requirements for the BPM system are: (1) a single-pass resolution of 100 µm rms for a 100 pC bunch and an electric center accuracy of 100 µm rms for the initial beam commissioning to achieve the first turn, (2) a closed-orbit distortion (COD) resolution better than 0.1 µm rms for a 100 mA stored beam and a position stability of less than 5 µm for the ultimate stability of a photon beam axis. We have completed prototypes of a precise button electrode and a BPM block to obtain high-intensity signals and sufficient mechanical accuracy while suppressing high-Q trapped modes leading to impedance and heating issues. The development of readout electronics based on the MTCA.4 standard and the evaluation of radiation-hard coaxial cables have also been conducted. The prototype BPM head was installed in the present SPring-8 storage ring for performance verification with an actual electron beam. We confirmed sufficient signal intensity, electric center accuracy, position stability, etc. by the beam test. The new BPM system is almost ready for the SPring-8 upgrade.  
slides icon Slides TUOC04 [2.126 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUOC04  
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TUPB01 The Installation and Commissioning of the AWAKE Stripline BPM 253
 
  • S. Liu, P.E. Dirksen, V.A. Verzilov
    TRIUMF, Vancouver, Canada
  • S.J. Gessner, F. Guillot-Vignot, D. Medina, L. Søby
    CERN, Geneva, Switzerland
 
  Funding: # TRIUMF contribution was supported by NSERC and CNRC
AWAKE (The Advanced Proton Driven Plasma Wakefield Acceleration Experiment at CERN) stripline BPMs are required to measure the position of the single electron bunch to a position resolution of less than 10 µm rms for electron charge of 100 pC to 1 nC. This paper describes the design, installation and commissioning of a such BPM system developed by TRIUMF (Canada). Total 12 BPMs and electronics had been installed on AWAKE beam lines and started commissioning since Fall of 2017. The calibration and measurement performance are also reviewed.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB01  
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TUPB02 Complete Test Results of New BPM Electronics for the ESRF New LE-Ring 257
 
  • K.B. Scheidt
    ESRF, Grenoble, France
 
  Among the 320 BPMs in the ESRF new low emittance ring, a set of 128 units will be equipped with new electronics, while the other set (192) will be served by the existing Libera-Brilliance electronics. These new electronics are an upgraded version of the low-cost Spark electronics originally developed 3 years ago for the ESRF Injector complex. All these 128 units have been installed in the first half of 2018 on existing BPM signals (through duplication with RF-splitters) and subsequently been tested thoroughly for performance characteristics like stability, resolution and reliability. It will be shown that while these Sparks have a very straightforward and simple concept, i.e. completely omitting calibration schemes like RF-cross-bar switching, pilot-tone introduction or active temperature control, that they are fully compatible with all the beam position measurement requirements of this new ring.  
poster icon Poster TUPB02 [1.577 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB02  
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TUPB03 Results of SPIRAL2 Beam Position Monitors on the Test Bench of the RFQ 261
 
  • M. Ben Abdillah, P. Ausset
    IPN, Orsay, France
  • R. Ferdinand
    GANIL, Caen, France
 
  SPIRAL2 project is based on a multi-beam superconducting LINAC designed to accelerate 5 mA deuteron beams up to 40 MeV, proton beams up to 33 MeV and 1 mA light and heavy ions (Q/A = 1/3) up to 14.5 MeV/A. The accurate tuning of the LINAC is essential for the operation of SPIRAL2 and requires measurement of the beam transverse position, the phase of the beam with respect to the radiofrequency voltage, the ellipticity of the beam and the beam energy with the help of Beam Position Monitor (BPM) system. The commissioning of the RFQ gave us the opportunity to install two BPM sensors, associated with their electronics, mounted on a test bench. The test bench is a D-plate fully equipped with a complete set of beam diagnostic equipment in order to characterize as completely as possible the beam delivered by the RFQ and to gain experience with the behavior of these diagnostics under beam operation. This paper addresses the measurements carried with the two BPMs on the Dplate: energy, transverse position and ellipticity under 750 KeV proton beam operation  
poster icon Poster TUPB03 [1.443 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB03  
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TUPB04 Development of a New Button Beam-position Monitor for BESSY VSR 265
 
  • J.G. Hwang, V. Dürr, M. Ries, A. Schälicke, G. Schiwietz, D. Wolk
    HZB, Berlin, Germany
 
  An extreme operation mode such as the BESSY-VSR conditions stimulates the development of a high accuracy bunch-by-bunch beam-position monitor (BPM) system which is compatible with the bunch-selective operation for the orbit feedback system. Such a system will also greatly benefit to accelerator R&D such as transverse resonance island buckets (TRIBs). Compensation of the long-range ringing signal produced by the combined effect of impedance mismatching inside the button and trapped TE-modes in the aluminum-oxide insulator (Al2O3) material is required essentially to improve the resolution. This is important since the ringing causes a misreading of the beam position and current of following bunches. We show the design study of a new button-type BPM to mitigate the influence of the ringing signal as well as to reduce wake losses by improving the impedance matching in the button and by replacing the insulator material.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB04  
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TUPB05 Design of a Cavity Beam Position Monitor for the ARES Accelerator at DESY 269
 
  • D. Lipka, M. Dohlus, M. Marx, S. Vilcins, M. Werner
    DESY, Hamburg, Germany
 
  The SINBAD facility (Short and INnovative Bunches and Accelerators at DESY) is foreseen to host various experiments in the field of production of ultra-short electron bunches and novel high gradient acceleration techniques. The SINBAD linac, also called ARES (Accelerator Research Experiment at SINBAD), will be a conventional S-band linear RF accelerator allowing the production of low charge (within a range between 0.5 pC and 1000 pC) ultra-short electron bunches. To detect the low charge bunches a cavity beam position monitor is designed based on the experience from the EU-XFEL. It will consist of a stainless steel body with low Q factor of 70, a resonance frequency of 3.3 GHz and a relative wide gap of 15 mm to reach a high peak position sensitivity of 4.25 V/(nC mm). The design considerations and simulation results will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB05  
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TUPB07 Stability Study of Beam Position Measurement Based on Higher Order Mode Signals at FLASH 273
 
  • J.H. Wei
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  • N. Baboi
    DESY, Hamburg, Germany
  • L. Shi
    PSI, Villigen PSI, Switzerland
 
  FLASH is a free-electron laser driven by a supercon-ducting linac at DESY in Hamburg. It generates high-brilliance XUV and soft X-ray pulses by SASE (Self Amplified Spontaneous Emission). Many accelerating cavities are equipped with HOMBPMs (Higher Order Mode based Beam Position Monitors) to align the beam and monitor the transverse beam position. However, these lose their position prediction ability over time. In this paper, we applied an efficient measurement and signal analysis with various data process methods including PLS (Partial Least Square) and SVD (Singular Value Decomposition) to determine the transverse beam position. By fitting the HOM signals with a genetic algorithm, we implemented a new HOMBPM calibration procedure and obtained reliable beam prediction positions over a long time. A stable RMS error of about 0.2 mm by using the spectra of signals and 0.15 mm by using the new method over two months has been observed.  
poster icon Poster TUPB07 [1.816 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB07  
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TUPB09 The Evaluation of Beam Inclination Angle on the Cavity BPM Position Measurement 278
 
  • J. Chen, L.W. Lai, Y.B. Leng, L.Y. Yu, R.X. Yuan
    SINAP, Shanghai, People's Republic of China
 
  Cavity beam position monitor (CBPM) is widely used to measure the transverse position in free-electron laser (FEL) and international linear collider (ILC) facilities due to the characteristic of high sensitive. In order to study the limiting factors of the position resolution of cavity BPM, the influence of beam inclination angle on the measure-ment of CBPM position and the direction of beam deflec-tion was analyzed. The simulation results show that the beam inclination angle is an important factor limiting the superiority of CBPM with extremely high position resolu-tion. The relative beam experiments to change the relative inclination angle between the cavity and the electron beam based on a 4-dimension moveable platform were performed in Shanghai Soft X-ray FEL (SXFEL) facility, the experiment results will also be mentioned as well.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB09  
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TUPB10 Design and Simulation of Stripline BPM for HUST Proton Therapy Facility 281
 
  • J.Q. Li, Q.S. Chen, K. Fan, K. Tang, P. Tian
    HUST, Wuhan, People's Republic of China
 
  Proton beams used in Huazhong University of Science and Technology Proton Therapy Facility(HUST-PTF)have extreme low currents of the order of nanoampere,which is a great challenge to beam diagnostics due to low signal level. Conventional destructive beam diagnostic devices will affect the quality of the beam and cannot work online during the patient treatment, so a non-destructive stripline beam position monitor (BPM) is designed. This study will introduce some analysis and simulation results of the stripline BPM, such as the coupling between the electrodes, impedance matching, signal response, etc. We also discussed how to increase the output signal by geometry optimization.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB10  
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TUPB12 Machine Studies with Libera Instruments at the SLAC Spear3 Accelerators 284
 
  • S. Condamoor, W.J. Corbett, D.J. Martin, S. C. Wallters
    SLAC, Menlo Park, California, USA
  • M. Cargnelutti, P. Leban
    I-Tech, Solkan, Slovenia
  • L.W. Lai
    SSRF, Shanghai, People's Republic of China
  • Q. Lin
    Donghua University, Shanghai, People's Republic of China
 
  Turn-by-turn BPM readout electronics were tested on the SPEAR3 booster synchrotron and storage ring to identify possible improvements for the booster injection process and to characterize processor performance in the storage ring. For this purpose, Libera Spark and Libera Brilliance+ instruments were customized for the booster (358.4 MHz) and storage ring (476.3 MHz) radio-frequencies, respectively, and tested during machine studies. Even at low single-bunch booster beam current, the dynamic range of the Libera Spark readout electronics provided excellent transverse position measurement capability during the linac-to-booster injection process, the energy ramp-up phase and during beam extraction. Booster injection efficiency was also analyzed as a function of linac S-band bunch train arrival time. In the SPEAR3 storage ring turn-by-turn Libera Brilliance+ measurement capability was evaluated for single and multi-bunch fill patterns as a function of beam current. The single-turn measurement resolution was found to be better than 10 microns for a single 3 mA bunch. The horizontal single-bunch damping time was then determined with the 238 MHz bunch-by-bunch feedback system on and off.  
poster icon Poster TUPB12 [1.531 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB12  
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TUPB13 Stability Tests with Pilot-Tone Based Elettra BPM RF Front End and Libera Electronics 289
 
  • M. Cargnelutti, P. Leban, M. Žnidarčič
    I-Tech, Solkan, Slovenia
  • S. Bassanese, G. Brajnik, S. Cleva, R. De Monte
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
 
  Long-term stability is one of the most important properties of the BPM readout system. Recent developments on pilot tone capable front end have been tested with an established BPM readout electronics. The goal was to demonstrate the effectiveness of the pilot tone compensation to varying external conditions. Simulated cable attenuation change and temperature variation of the readout electronics were confirmed to have no major effect to position data readout. The output signals from Elettra front end (carrier frequency and pilot tone frequency) were processed by a Libera Spark with the integrated standard front end which contains several filtering, attenuation and amplification stages. Tests were repeated with a modified instrument (optimized for pilot tone) to compare the long-term stability results. Findings show the pilot tone front end enables great features like self-diagnostics and cable-fault compensation as well as small improvement in the long-term stability. Measurement resolution is in range of 10 nanometers RMS in 5 Hz bandwidth.  
poster icon Poster TUPB13 [1.223 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB13  
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TUPB14 New Beam Position Monitors for the CERN Linac3 to LEIR Ion Beam Transfer Line 293
 
  • L. Søby, G. Baud, M. Bozzolan, R. Scrivens
    CERN, Geneva, Switzerland
 
  The injection line into the CERN Low Energy Ion Ring (LEIR) has recently been equipped with nine, new, electrostatic Beam Position Monitors (BPMs) in order to measure and optimize the trajectory of the low intensity ion beams coming from LINAC3. In this paper, we describe the design of the BPM, the low noise charge amplifier mounted directly on the BPM, and the digital acquisition system. There is special emphasis on the first commissioning results where the measured beam positions were seen to be perturbed by EMI and charging of the BPM electrodes by secondary particles. The effect of mitigation measures, including repelling voltages on the electrodes and external magnetic fields, are also discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPB14  
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TUPC01 Australian Synchrotron BPM Electronics Upgrade 297
 
  • Y.E. Tan, R.B. Hogan
    AS - ANSTO, Clayton, Australia
 
  The storage ring at the Australian Synchrotron (AS) was originally equipped with 98 Libera Electrons. In late 2017 all 98 of the BPM electronics has been upgraded to Libera Brilliance+ and the old Libera Electrons have been moved to the injection system. The transition process and results from commissioning the new system will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPC01  
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TUPC03 Beam Quality Monitoring System in the HADES Experiment at GSI Using CVD Diamond Material* 300
 
  • A. Rost, T. Galatyuk
    TU Darmstadt, Darmstadt, Germany
  • J. Adamczewski-Musch, S. Linev, J. Pietraszko, M. Traxler
    GSI, Darmstadt, Germany
 
  Funding: *Work supported by the DFG through GRK 2128 and VH-NG-823.
The beam quality monitoring of extracted beams from SIS18, transported to the HADES experiment, is of great importance to ensure high efficiency data recording. The main detector system used for this purpose is the Start-Veto system which consists of two diamond based sensors made of pcCVD and scCVD materials. Both sensors are equipped with a double-sided strip segmented metalization (300 µm width) which allows a precise position determination of the beam position. Those senors are able to deliver a time precision <100 ps and can handle rate capabilities up to 107 particles/channel. The read-out of the sensors is based on the TRB3 system [1]. Precise FPGA-TDCs (264 channels, <10 ps RMS) are implemented inside FPGAs. The TRB3 system serves as data acquisition system with scaler capability. Analysis and on-line visualization will be performed in DABC [2]. Having the precise time measurement and a precise position information of the incoming beam ions one can monitor important beam parameters namely the beam intensity, its position during extraction and the beam time structure. In this contribution the general read-out concept will be introduced.
[1] A. Neiser et al., TRB3: a 264 channel high precision TDC platform and its applications, 2013 JINST 8 C12043.
[2] dabc.gsi.de, 30.05.2018
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPC03  
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TUPC04 BPM System Upgrade at COSY 303
 
  • V. Kamerdzhiev, I. Bekman, C. Böhme, B. Lorentz, S. Merzliakov, P. Niedermayer, K. Reimers, M. Simon, M. Thelen
    FZJ, Jülich, Germany
 
  The beam position monitoring system of the Cooler Synchrotron (COSY) has been upgraded in 2017. The upgrade was driven by the requirement of the JEDI collaboration to significantly improve the orbit control and by the electronics approaching end-of-life. The entire signal processing chain has been replaced. The new low noise amplifiers, mounted directly on the BPM vacuum feedthroughs, were developed in-house and include adjustable gain in 80 dB rage and in-situ test and calibration capabilities. The signals are digitized and processed by means of commercial BPM signal processing units featuring embedded EPICS IOC. The decision path, technical details of the upgrade and performance of the new system are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPC04  
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TUPC05 Influence of Sampling Rate and Passband on the Performance of Stripline BPM 307
 
  • T. Wu, S.S. Cao, F.Z. Chen, Y.B. Leng, Y.M. Zhou
    SSRF, Shanghai, People's Republic of China
  • J. Chen, L.W. Lai
    SINAP, Shanghai, People's Republic of China
 
  It is obviously that the property of SBPM is influenced by data acquisition system, but how the procedure of data acquisition and processing takes effect is still room for enquiring into it. This paper will present some data simulation and experiment results to discuss the function between resolution and pass band, sampling rate or other influence factor. We hope that this paper would give some advice for building up data acquisition system of SBPM.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPC05  
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TUPC07 First Results of Button BPMs at FRIB 311
 
  • S. Cogan, J.L. Crisp, T.M. Ford, S.M. Lidia
    FRIB, East Lansing, USA
 
  Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661, the State of Michigan and Michigan State University.
Commissioning and tuning the linac driver for the Facility for Rare Isotope Beams (FRIB) requires a large network of warm and cryogenic BPMs, with apertures of 40 - 150 mm, sensitivity to beam currents of 100 nA to 1 mA, and accurate for beams with velocities as low as 0.03c. We present initial results of the BPM system, analog and digital signal processing, distortion and error correction, and calibration for time of flight (TOF) measurements. Measurements for low energy beams are presented.
 
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