Keyword: operation
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MOOB01 Beam Commissioning of SuperKEKB Rings at Phase-2 detector, feedback, MMI, timing 6
 
  • M. Tobiyama, M. Arinaga, J.W. Flanagan, H. Fukuma, H. Ikeda, H. Ishii, S.H. Iwabuchi, G.M. Mitsuka, K. Mori, M. Tejima
    KEK, Ibaraki, Japan
  • G. Bonvicini
    Wayne State University, Detroit, Michigan, USA
  • E. Mulyani
    Sokendai, Ibaraki, Japan
  • G.S. Varner
    University of Hawaii, Honolulu,, USA
 
  The Phase 2 commissioning of SuperKEKB rings with Belle II detector began in Feb. 2018. Staring the commissioning of positron damping ring (DR), the injection and storage of the main rings (HER and LER) smoothly continued in Apr., 2018. The first collision has been achieved on 26th Apr. with the detuned optics (200 mm x 8 mm). Performance of beam instrumentation systems and the difficulties encountered during commissioning time will be shown.  
slides icon Slides MOOB01 [11.232 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOOB01  
About • paper received ※ 05 September 2018       paper accepted ※ 11 September 2018       issue date ※ 29 January 2019  
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MOOB04 Upgrade of the Machine Protection System Toward 1.3 MW Operation of the J-PARC Neutrino Beamline target, proton, FPGA, electronics 18
 
  • K. Sakashita, M.L. Friend, K. Nakayoshi
    KEK, Ibaraki, Japan
  • Y. Koshio, S. Yamasu
    Okayama University, Faculty of Science, Okayama City, Japan
 
  The machine protection system (MPS) is one of the essential components to realize safe operation of the J-PARC neutrino beamline, where a high intensity neutrino beam for the T2K long baseline neutrino oscillation experiment is generated by striking 30GeV protons on a graphite target. The proton beam is extracted from the J-PARC main ring proton synchrotron (MR) into the primary beamline. The beamline is currently operated with 485kW MR beam power. The MR beam power is planned to be upgraded to 1.3+ MW. The neutrino production target could be damaged if the high intensity beam hits off-centered on the target, due to non-uniform thermal stress. Therefore, in order to protect the target, it is important to immediately stop the beam when the beam orbit is shifted. A new FPGA-based interlock module, with which the beam profile is calculated in real time, was recently developed and commissioned. This module reads out signals from a titanium-strip-based secondary emission profile monitor (SSEM) which is placed in the primary beamline. An overview of the upgrade plan of the MPS system and the results of an initial evaluation test of the new interlock module will be discussed.  
slides icon Slides MOOB04 [8.367 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOOB04  
About • paper received ※ 05 September 2018       paper accepted ※ 11 September 2018       issue date ※ 29 January 2019  
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MOPA02 Beam Diagnostics for SuperKEKB Damping Ring in Phase-II Operation injection, timing, radiation, extraction 29
 
  • H. Ikeda, M. Arinaga, J.W. Flanagan, H. Fukuma, H. Ishii, S.H. Iwabuchi, G.M. Mitsuka, K. Mori, M. Tejima, M. Tobiyama
    KEK, Ibaraki, Japan
 
  The SuperKEKB damping ring (DR) commissioning started in February 2018, before main ring (MR) Phase-II operation. We constructed the DR in order to deliver a low-emittance positron beam. The design luminosity of SuperKEKB is 40 times that of KEKB with high current and low emittance. A turn-by- turn beam position monitor (BPM), transverse feedback system, synchrotron radiation monitor (SRM), DCCT, loss monitor using ion chambers, bunch current monitor and tune meter were installed for beam diagnostics at the DR. An overview of the instrumentation and status will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA02  
About • paper received ※ 05 September 2018       paper accepted ※ 14 September 2018       issue date ※ 29 January 2019  
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MOPB14 SSRF Beam Operation Stability Evaluation Using Bunch by Bunch Beam Position Method injection, SRF, damping, storage-ring 104
 
  • N. Zhang
    SSRF, Shanghai, People’s Republic of China
  • Y.B. Leng, Y.M. Zhou
    SINAP, Shanghai, People’s Republic of China
 
  Funding: Work supported by National Natural Science Foundation of China (No.11575282 No.11375255 No.11305253)
In order to improve the efficiency and quality of light in top-up mode at SSRF, disturbance caused by leakage fields mismatch during injection should be minimized and stable. This could be evaluated by analysis of bunch by bunch residual betatron oscillation data, using this method, instability of tune distribution and damping repeatability could also be calculated. So we could evaluate the beam operation stability by the data analysis and discuss in the paper.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPB14  
About • paper received ※ 05 September 2018       paper accepted ※ 11 September 2018       issue date ※ 29 January 2019  
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MOPB16 Continuous Beam Energy Measurements at Diamond Light Source polarization, beam-losses, wiggler, resonance 107
 
  • N. Vitoratou, P. Karataev
    Royal Holloway, University of London, Surrey, United Kingdom
  • P. Karataev
    JAI, Egham, Surrey, United Kingdom
  • G. Rehm
    DLS, Oxfordshire, United Kingdom
 
  Resonant Spin Depolarization (RSD) is a well-known technique that has been employed by Diamond Light Source (DLS) for beam energy measurements. In this project, we study a new approach to make RSD compatible with user beam operation and provide a continuously updated online measurement. An array of four custom-made scintillation detectors has been installed around the beam pipe, downstream of collimators to capture the highest fraction of lost particles and maximize the count rate. The excitation is gated to half of the stored bunches and the acquisition system counts losses in both halves independently. Using the count in the un-excited part for normalisation suppresses external factors that modify the loss rate. Different parameters of the measurement, like excitation kick strength and duration have been explored to optimise depolarisation and to increase the reliability of the measurement.  
poster icon Poster MOPB16 [3.136 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPB16  
About • paper received ※ 05 September 2018       paper accepted ※ 24 September 2018       issue date ※ 29 January 2019  
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MOPC02 Identification of Faulty Beam Position Monitor Based Clustering by Fast Search and Find of Density Peaks SRF, storage-ring, electron, electronics 114
 
  • R. Jiang, Y.B. Leng
    SSRF, Shanghai, People’s Republic of China
  • F.Z. Chen, Z.C. Chen, Y.B. Leng
    SINAP, Shanghai, People’s Republic of China
 
  The accuracy and stability of beam position moni-tors(BPMs) are important for all kinds of measurement systems and feedback systems in particle accelerator field. A proper method detecting faulty beam position monitor or monitoring their stability could optimize accel-erator operating conditions. With development in ma-chine learning methods, a series of powerful analysis approaches make it possible for detecting beam position monitor’s stability. Here, this paper proposed a clustering analysis approach to detect the defective BPMs. The method is based on the idea that cluster centres are char-acterized by a higher density than their neighbours and by a relatively large distance from points with higher densi-ties. The results showed that clustering by fast search and find of density peaks could classify beam data into dif-ferent clusters on the basis of their similarity. And that, aberrant data points could be detected by decision graph. So the algorithm is appropriate for BPM detecting and it could be a significant supplement for data analysis in accelerator physics.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPC02  
About • paper received ※ 05 September 2018       paper accepted ※ 11 September 2018       issue date ※ 29 January 2019  
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MOPC04 Beam Charge Measurement and System Calibration in CSNS proton, target, extraction, electronics 122
 
  • W.L. Huang, F. Li
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • L. Ma, S. Wang, T.G. Xu
    IHEP, Beijing, People’s Republic of China
 
  In China Spallation Neutron Source(CSNS), the beam charge monitors along the ring to the target beam transport line(RTBT) and the ring to the dump beam transport line(RDBT), are consisted of an ICT and three FCTs manufactured by Bergoz. The electronics includes a set of NI PXIe-5160 oscilloscope digitizer, and a Beam Charge Monitor(BCM) from Bergoz as supplementary. The beam charge monitors provide the following information: a) the quantity of protons bombarded the tungsten target; b) the efficiency of particle transportation; c) a T0 signal to the detectors and spectrometers of the white neutron source. With the calibration with an octopus 50Ω terminator in lab and an onboard 16-turn calibrating coils at the local control room, corrections for the introducing the 16-turn calibrating coils and the long cable were made. An accuracy of ±2% for the beam charge measurement during the machine operation has been achieved with the ICT/FCTs and a PXIe-5160 oscilloscope digitizer.  
poster icon Poster MOPC04 [3.082 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPC04  
About • paper received ※ 04 September 2018       paper accepted ※ 11 September 2018       issue date ※ 29 January 2019  
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MOPC18 Development of an Expert System for the High Intensity Neutrino Beam Facility at J-PARC kicker, septum, status, proton 154
 
  • K. Nakayoshi, Y. Fujii, T. Nakadaira, K. Sakashita
    KEK, Ibaraki, Japan
 
  A high intensity neutrino beam is utilized by a long-baseline neutrino oscillation experiment at J-PARC. To generate a high intensity neutrino beam, a high intensity proton beam is extracted from a 30GeV Main Ring Synchrotron (MR) to the neutrino primary beamline. In the beamline, one mistaken shot can potentially do serious damage to beamline equipment. To avoid such a consequence, many beamline equipment interlocks to stop the beam operation are implemented. Once an interlock is activated, prompt and proper error handling is necessary. We are developing an expert system for prompt and efficient understanding of the status to quickly resume the beam operation. An inference engine is one key component in the expert system. We are developing a Machine-Learning(ML) based inference engine for our expert system. ML is one of the most active research fields in computing, we adopt the technology from it. We report the progress of development of the expert system especially ML based inference engine.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPC18  
About • paper received ※ 05 September 2018       paper accepted ※ 12 September 2018       issue date ※ 29 January 2019  
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TUOA01 The Diagnostic System at the European XFEL; Commissioning and First User Operation FEL, MMI, diagnostics, electron 162
 
  • D. Nölle
    DESY, Hamburg, Germany
 
  The European XFEL is now commissioned and user operation has started. Long bunch trains up to 300 bunches are established. The role of and experience with the beam diagnostic will be reported. Highlights, problems and their solutions will be discussed.  
slides icon Slides TUOA01 [8.932 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUOA01  
About • paper received ※ 04 September 2018       paper accepted ※ 11 September 2018       issue date ※ 29 January 2019  
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TUOB03 Demonstration of a Newly Developed Pulse-by-pulse X-Ray Beam Position Monitor in SPring-8 detector, radiation, storage-ring, ISOL 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  
About • paper received ※ 31 August 2018       paper accepted ※ 11 September 2018       issue date ※ 29 January 2019  
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TUPA04 Analysis of Interlocked Events based on Beam Instrumentation Data at J-PARC Linac and RCS linac, vacuum, detector, instrumentation 219
 
  • N. Hayashi, S. Hatakeyama, A. Miura, M. Yoshimoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • K. Futatsukawa, T. Miyao
    KEK, Ibaraki, Japan
 
  J-PARC is a multi-purpose facility. Accelerator stability is the one of important issues for users of this facility. To realize stable operation, we must collect data on interlocked events and analyze these data to determine the reasons for the occurrence of such events. In J-PARC Linac, data of interlocked events have been recorded using several some beam loss monitors and current monitors, and these data have been are analyzed and classified. In J-PARC RCS, new instrumentation is being introduced to obtain beam position. We discuss the present status and future plans related to this subject.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPA04  
About • paper received ※ 07 September 2018       paper accepted ※ 12 September 2018       issue date ※ 29 January 2019  
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TUPA16 Signal Processing for Beam Loss Monitor System at Jefferson Lab machine-protect, FPGA, controls, detector 245
 
  • J. Yan, T.L. Allison, S. Bruhwel, W. Lu
    JLab, Newport News, Virginia, USA
 
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
Ion Chamber and Photomultiplier Tube (PMT) were both used for beam loss monitor in the Machine Protection System (MPS) at Jefferson Lab. The requirements of signal processing of these detectors are different, so two VME-based signal processing boards, Beam Loss Monitor (BLM) board and Ion-Chamber board, were developed. The BLM board has fast response (< 1us) and 5 decades dynamic range from 10nA to 1 mA, while the Ion-Chamber board has 8 decades dynamic range from 100 pA to 10 mA and slower response. Both of boards provide functions of machine protection and beam diagnostics, and have features of fast shutdown (FSD) interface, beam sync interface, built-in-self-test, remotely controlled bias signals, and on-board memory buffer.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPA16  
About • paper received ※ 04 September 2018       paper accepted ※ 13 September 2018       issue date ※ 29 January 2019  
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TUPA17 Status of the BNL LEReC Machine Protection System gun, MMI, electron, laser 249
 
  • S. Seletskiy, Z. Altinbas, D. Bruno, M.R. Costanzo, K.A. Drees, A.V. Fedotov, D.M. Gassner, X. Gu, L.R. Hammons, J. Hock, R.L. Hulsart, P. Inacker, J.P. Jamilkowski, D. Kayran, J. Kewisch, C. Liu, K. Mernick, T.A. Miller, M.G. Minty, M.C. Paniccia, W.E. Pekrul, I. Pinayev, V. Ptitsyn, V. Schoefer, L. Smart, K.S. Smith, R. Than, P. Thieberger, J.E. Tuozzolo, W. Xu, Z. Zhao
    BNL, Upton, Long Island, New York, USA
 
  The low energy RHIC Electron Cooler (LEReC) will be operating with 1.6-2.6 MeV electron beams having up to 140 kW power. It was determined that under the worst case scenario the missteered electron beam can damage the vacuum chamber and in-vacuum components within 40 us. Hence, the LEReC requires a dedicated fast machine protection system (MPS). The LEReC MPS has been designed and built and currently is under commissioning. In this paper we describe the most recent developments with the LEReC MPS.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPA17  
About • paper received ※ 31 August 2018       paper accepted ※ 13 September 2018       issue date ※ 29 January 2019  
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TUPB03 Results of SPIRAL2 Beam Position Monitors on the Test Bench of the RFQ linac, electron, rfq, electronics 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  
About • paper received ※ 04 September 2018       paper accepted ※ 13 September 2018       issue date ※ 29 January 2019  
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TUPB04 Development of a New Button Beam-position Monitor for BESSY VSR impedance, vacuum, resonance, storage-ring 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  
About • paper received ※ 04 September 2018       paper accepted ※ 11 September 2018       issue date ※ 29 January 2019  
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TUPC04 BPM System Upgrade at COSY controls, EPICS, electron, electronics 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  
About • paper received ※ 13 September 2018       paper accepted ※ 14 September 2018       issue date ※ 29 January 2019  
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TUPC09 Initial Results from the LHC Multi-Band Instability Monitor detector, synchrotron, electron, betatron 314
 
  • T.E. Levens, T. Lefèvre, D. Valuch
    CERN, Meyrin, Switzerland
 
  Intra-bunch transverse instabilities are routinely measured in the LHC using a "Head-Tail Monitor" based on sampling a wide-band BPM with a high-speed digitiser. However, these measurements are limited by the dynamic range and short record length possible with typical commercial oscilloscopes. This paper will present the initial results from the LHC Multi-Band Instability Monitor, a new technique developed to provide information on the beam stability with a high dynamic range using frequency domain analysis of the transverse beam spectrum.  
poster icon Poster TUPC09 [17.388 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPC09  
About • paper received ※ 05 September 2018       paper accepted ※ 13 September 2018       issue date ※ 29 January 2019  
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WEOB01 New Beam Loss Detector System for EBS-ESRF SRF, detector, injection, vacuum 346
 
  • L. Torino, K.B. Scheidt
    ESRF, Grenoble, France
 
  In view of the construction and the commissioning of the new Extremely Brilliant Source (EBS) ring, a new Beam Loss Detector (BLDs) system has been developed, installed and tested in the present European Synchrotron Radiation Facility (ESRF) storage ring. The new BLD system is composed of 128 compact PMT-scintillator based BLDs, distributed evenly and symmetrically at 4 BLDs per cell, controlled and read out by 32 Libera Beam Loss Monitors (BLMs). The detectors fast response and the versatility of the read-out electronics allow to measure fast losses with an almost bunch-by-bunch resolution, as well as integrated losses useful during the machine operation. In this paper the different acquisition modes will be explained and results obtained during injection and normal operation will be presented.  
slides icon Slides WEOB01 [8.727 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEOB01  
About • paper received ※ 04 September 2018       paper accepted ※ 13 September 2018       issue date ※ 29 January 2019  
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WEPB01 Photon Beam Imager at SOLEIL undulator, radiation, vacuum, photon 425
 
  • M. Labat, J. Da Silva, N. Hubert, F. Lepage
    SOLEIL, Gif-sur-Yvette, France
 
  In one of the long straight sections of SOLEIL is installed a pair of canted in-vacuum undulators for the ANATOMIX and NANOSCOPIUM beamlines. Since the upstream undulator radiation can potentially damage the downstream undulator magnets, an accurate survey of the respective alignment of the two devices is mandatory. An XBPM has been initially installed for this purpose in the beamline frontend. For redundancy and further analysis, an X-ray imager was then designed and added just downstream the XBPM. It is made of a diamond plate that can be inserted into the upstream beamline frontend at low current. Fluorescence of the Nitrogen impurities in the diamond is imaged on a CCD to check that the upstream radiation is not hitting the downstream insertion device. We present the commissioning of this new device together with its first results in operation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPB01  
About • paper received ※ 05 September 2018       paper accepted ※ 12 September 2018       issue date ※ 29 January 2019  
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WEPB03 First Prototype of a Coronagraph-based Halo Monitor for BERLinPro diagnostics, SRF, linac, cavity 434
 
  • J.G. Hwang, J. Kuszynski
    HZB, Berlin, Germany
 
  Since particle losses by beam halo induced by space charge force and scattering of trapped ions are critical issues for superconducting-linac based high power machines such as BERLinPro, a halo monitor is demanded to monitor and control particle distribution at the level of 10-4 ~ 10-5 of the core intensity. A coronagraph-based halo monitor was adopted and the first prototype has been designed as a demonstrator system aimed at resolving a halo-core contrast in the 10-3 to 10-4 range. This monitor was tested at BESSY II with various operation modes such as Transverse Resonance Island Buckets (TRIBs) and Pulse-Picking by Resonant Excitation (PPRE). We show our design parameters, experimental criterion, and experimental results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPB03  
About • paper received ※ 04 September 2018       paper accepted ※ 12 September 2018       issue date ※ 29 January 2019  
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WEPC08 Optical System of Beam Induced Fluorescence Monitor Toward MW Beam Power at the J-PARC Neutrino Beamline proton, photon, simulation, radiation 505
 
  • S.V. Cao, M.L. Friend, K. Sakashita
    KEK, Tsukuba, Japan
  • M. Hartz
    Kavli IPMU, Kashiwa, Japan
  • A. Nakamura
    Okayama University, Okayama, Japan
 
  A Beam Induced Fluorescence (BIF) monitor is being developed as an essential part of the monitor update toward MW beam power operation at the J-PARC neutrino beamline. By measuring the fluorescence light from proton-gas interactions, the BIF monitor will be used as a continuous and non-destructive diagnostic tool for monitoring the proton beam profile spill-by-spill, with position and width precision on the order of 200 µm. The main challenge lies in collecting a sufficient amount of fluorescence light for the beam profile reconstruction while controlling the beam-induced noise with the current beamline configuration. A study is presented with a particular focus on the optical system under development, which allows us to transport fluorescence light away from the high radiation environment near the proton beamline and detect the optical signal with a Multi-Pixel Photon-Counter-based fast readout.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC08  
About • paper received ※ 06 September 2018       paper accepted ※ 13 September 2018       issue date ※ 29 January 2019  
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THOA01 Low vs High Level Programming for FPGA FPGA, interface, experiment, software 527
 
  • J. Marjanovic
    DESY, Hamburg, Germany
 
  From their introduction in the eighties, Field-Programmable Gate Arrays (FPGAs) have grown in size and performance for several orders of magnitude. As the FPGA capabilities have grown, so have the designs. It seems that current tools and languages (VHDL and (System)Verilog) do not match the complexity required for advanced digital signal processing (DSP) systems usually found in experimental physics applications. In the last couple of years several commercial High-Level Synthesis (HLS) tools have emerged, providing a new method to implement FPGA designs, or at least some parts of it. By providing a higher level of abstraction, new tools offer a possibility to express algorithms in a way which is closer to the mathematical description. Such implementation is understood by a broader range of people, and thus minimizes the documentation and communication issues. Several examples of DSP algorithms relevant for beam instrumentation will be presented. Implementations of these algorithms with different HLS tools and traditional implementation in VHDL will be compared.  
slides icon Slides THOA01 [1.873 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-THOA01  
About • paper received ※ 04 September 2018       paper accepted ※ 12 September 2018       issue date ※ 29 January 2019  
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THOB03 Long Term Investigation of the Degradation of Coaxial Cables radiation, insertion, scattering, photon 552
 
  • M. Kuntzsch, R. Schurig
    HZDR, Dresden, Germany
  • S.J. Burger
    Delta Gamma RF-Expert, Melbourne, Australia
  • T. Weber
    el-spec GmbH, Geretsried, Germany
 
  For the transport of RF signals coaxial cables with PTFE (’Teflon’) as dielectric medium are widely used because they offer a wide bandwidth and low insertion loss. Coaxial cables that are routed in immediate vicinity to the beamline are exposed to ionizing radiation that is mainly generated by beam-loss. In this radiative environment cables change their electrical properties which directly affects the signal on the receiver side and in turn the measured beam parameters. This contribution describes a measurement setup at the superconducting CW accelerator ELBE that was used to investigate the degradation of coaxial cables under well-controlled conditions up to an accumulated dose of 94 kGy. Furthermore the acquired data up to 40 GHz of two coaxial cable samples are presented and the results are discussed.  
slides icon Slides THOB03 [6.958 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-THOB03  
About • paper received ※ 05 September 2018       paper accepted ※ 12 September 2018       issue date ※ 29 January 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)