Keyword: detector
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MOOB01 Beam Commissioning of SuperKEKB Rings at Phase-2 operation, 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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MOPA04 The Beam Instruments for HIMM@IMP synchrotron, MMI, extraction, cyclotron 33
 
  • T.C. Zhao, Y.C. Chen, J.M. Dong, Y.C. Feng, X.C. Kang, M. Li, S. Li, W.L. Li, W.N. Ma, R.S. Mao, H.H. Song, K. Song, Y. Wang, K. Wei, Z.G. Xu, Y. Yan, Y. Yin, Z.L. Zhao
    IMP/CAS, Lanzhou, People’s Republic of China
 
  HIMM(Heavy Ion Medical Machine)is a synchrotron based accelerator for cancer therapy in Wuwei city, China. It is composed of 2 ion sources, LEBT, cyclotron, MEBT, a synchrotron, HEBT and therapy terminals. The commissioning of HIMM is completed .At present, electrical safety, electromagnetic compatibility and performance testing of medical devices have been passed, and now enters the clinical tests phase. The beam diagnositics(BD) devices for HIMM are designed and produced by IMP BD department .An overview of the integrated devices is presented, and the common beam parameters in the different parts of the accelerator facility are reviewed including intensity measurement, beam profile, emmitance, energy and so on with the related detectors such as the View Screen, Faraday Cup, Radial Detector, Multi-wires, Phase Probe, Wire Scanner, DCCT, ICT, BPM, Schottky, Slit, Beam Stopper, Beam Halo Monitor, Multi-channel Ionization Chamber. Additionally, the RF-KO for beam extraction, the strip foil with automatic control system as well as the detectors for terminal therapy are described.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA04  
About • paper received ※ 05 September 2018       paper accepted ※ 13 September 2018       issue date ※ 29 January 2019  
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MOPA06 Recent Advances in Beam Monitoring During SEE Testing on ISDE&JINR Heavy Ion Facilities monitoring, heavy-ion, radiation, real-time 36
 
  • P.A. Chubunov
    ISDE, Moscow, Russia
  • V.S. Anashin
    United Rocket and Space Corporation, Institute of Space Device Engineering, Moscow, Russia
  • A. Issatov
    JINR/FLNR, Moscow region, Russia
  • S.V. Mitrofanov
    JINR, Dubna, Moscow Region, Russia
 
  SEE testing of candidate electronic components for space applications is essential part of a spacecraft radiation hardness assurance process in terms of its operability in the harsh space radiation environment. The unique in Russia SEE test facilities have been created to provide SEE testing. The existing ion beam monitoring system has been presented at IBIC 2017, however, it has a number of shortcomings related to the lack of reliable online ion fluence measurement on the DUT, and inability to measure energies of the high-energy (15-60 MeV/nucleon) long-range (10-2000 µm) ions on the DUT. The paper presents the latest developments and their test results of the ISDE and JINR collaboration in the field of flux online monitoring (including, on the DUT) during tests using scintillation detectors based on flexible optical fibers, and measuring ion energies by the method of total absorption in the volume of scintillation or semiconductor detector. The modernization of the standard beam monitoring procedure during tests is proposed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA06  
About • paper received ※ 06 September 2018       paper accepted ※ 12 September 2018       issue date ※ 29 January 2019  
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MOPA13 Fast Luminosity Monitoring for the SuperKEKB Collider (LumiBelle2 Project) luminosity, MMI, feedback, monitoring 51
 
  • C.G. Pang, P. Bambade, S. Di Carlo, D. Jehanno, V. Kubytskyi, Y. Peinaud, C. Rimbault
    LAL, Orsay, France
  • Y. Funakoshi, S. Uehara
    KEK, Ibaraki, Japan
 
  LumiBelle2 is a fast luminosity monitoring system prepared for SuperKEKB. It uses sCVD diamond detectors placed in both the electron and positron rings to measure the Bhabha scattering process at vanishing scattering angle. Two types of online luminosity signals are provided, a Train-Integrated-Luminosity at 1 kHz as input to the dithering feedback system used to maintain optimum overlap between the colliding beams in horizontal plane, and Bunch-Integrated-Luminosities at about 1 Hz to check for variations along the bunch trains. Individual beam sizes and offsets can also be determined from collision scanning. This paper will describe the design of LumiBelle2 and report on its performance during the Phase-2 commissioning of SuperKEKB.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA13  
About • paper received ※ 04 September 2018       paper accepted ※ 11 September 2018       issue date ※ 29 January 2019  
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MOPB06 DAΦNE Luminosity Monitor luminosity, simulation, scattering, experiment 81
 
  • A. De Santis, C. Bisegni, O.R. Blanco-García, O. Coiro, A. Michelotti, C. Milardi, A. Stecchi
    INFN/LNF, Frascati (Roma), Italy
 
  The DAΦNE collider instantaneous luminosity has been measured identifying Bhabha scattering events at low polar angle (∼10°) around the beam axis by using two small crystal calorimeters shared with the KLOE-2 experiment. Independent DAQ setup based on !CHAOS, a novel Control System architecture, has been designed and realized in order to implement a fast luminosity monitor, also in view of the DAΦNE future physics runs. The realized setup allows for measurement of Bunch-by-Bunch (BBB) luminosity that allows to investigate the beam-beam interaction for the Crab-Waist collisions at DAΦNE and luminosity dependence on the bunch train structure.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPB06  
About • paper received ※ 06 September 2018       paper accepted ※ 12 September 2018       issue date ※ 29 January 2019  
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MOPB09 Comparison Among Different Tune Measurement Schemes at HLS-II Storage Ring betatron, storage-ring, pick-up, experiment 93
 
  • L.T. Huang, X.Y. Liu, P. Lu, M.X. Qian, B.G. Sun, J.G. Wang, J.H. Wei, F.F. Wu, Y.L. Yang, T.Y. Zhou
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
 
  Tune measurement is one of the most significant beam diagnostics at HLS-II storage ring. When measuring tune, higher tune spectral component and lower other compo-nents are expected, so that the tune measurement will be more accurate. To this end, a set of BBQ (Base Band Tune) front-end based on 3D (Direct Diode Detection) technique has previously developed to improve the effec-tive signal content and suppress other components. Em-ploying the BBQ front-end, four different tune measure-ment schemes are designed and related experiments per-formed on the HLS-II storage ring. Experimental results and analysis will be presented later.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPB09  
About • paper received ※ 05 September 2018       paper accepted ※ 11 September 2018       issue date ※ 29 January 2019  
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MOPC12 The Radial Detector in the Cyclotron of HIMM cyclotron, controls, target, extraction 140
 
  • M. Li, Y.C. Chen, Y.C. Feng, X.C. Kang, S. Li, W.L. Li, W.N. Ma, R.S. Mao, Y.G. Nie, H.H. Song, Y. Wang, Y. Yin, T.C. Zhao
    IMP/CAS, Lanzhou, People’s Republic of China
 
  The cyclotron is designed as the injector of the Heavy Ion Medical Machine (HIMM) in Wuwei city, China. It provides 10 uA carbon beams to fulfill the requirement of the accumulation in the following syn-chrotron. The Radial detector is used to measure the beam current and beam turn motion in this Cyclotron. The beam current signal gathered by radial detector is acquired by four picoammeters, meanwhile the beam time structure is measured with FPGA and real time operating system. This paper introduces the design of radial detector, the motion control and data acquisition system for it of the cyclotron. Finally, the beam current and turn pattern measurement results at HIMM are presented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPC12  
About • paper received ※ 05 September 2018       paper accepted ※ 12 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 radiation, operation, 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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TUOB04 A Vertical Phase Space Beam Position and Emittance Monitor for Synchrotron Radiation synchrotron, electron, experiment, photon 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  
About • paper received ※ 05 September 2018       paper accepted ※ 11 September 2018       issue date ※ 29 January 2019  
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TUPA02 A Micromegas Based Neutron Detector for the ESS Beam Loss Monitoring neutron, photon, simulation, proton 211
 
  • L. Segui, H. Alves, S. Aune, J. Beltramelli, Q. Bertrand, T. Bey, M. Combet, D. Desforge, F. Gougnaud, T.J. Joannem, M. Kebbiri, C. Lahonde-Hamdoun, P. Le Bourlout, Ph. Legou, O. Maillard, J. Marroncle, V. Nadot, T. Papaevangelou, G. Tsiledakis
    CEA-IRFU, Gif-sur-Yvette, France
  • I. Dolenc Kittelmann, T.J. Shea
    ESS, Lund, Sweden
  • Y. Mariette
    CEA-DRF-IRFU, France
 
  Beam loss monitors are of high importance in high-intensity hadron facilities where any energy loss can produce damage or/and activation of materials. A new type of neutron BLM have been developed for hadron accelerators aiming to cover the low energy part. In this region typical BLMs based on charged particle detection are not appropriate because the expected particle fields will be dominated by neutrons and photons. Moreover, the photon background due to the RF cavities can produce false beam loss signals. The BLM proposed is based on gaseous Micromegas detectors, designed to be sensitive to fast neutrons and insensitive to photons (X and gamma). In addition, the detectors will be insensitive to thermal neutrons, since part of them will not be directly correlated to beam loss location. The appropriate configuration of the Micromegas operating conditions will allow excellent timing, intrinsic photon background suppression and individual neutron counting, extending thus the dynamic range to very low particle fluxes. The concept of the detectors and the first results from tests in several facilities will be presented. Moreover, their use in the nBLM ESS system will be also discussed  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPA02  
About • paper received ※ 04 September 2018       paper accepted ※ 11 September 2018       issue date ※ 29 January 2019  
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TUPA03 Test of New Beam Loss Monitors for SOLEIL storage-ring, controls, shielding, electron 215
 
  • N. Hubert, M. El Ajjouri, D. Pédeau
    SOLEIL, Gif-sur-Yvette, France
 
  Soleil is currently testing new beam loss monitors to replace its pin-diode based existing system. The new detectors are made of plastic scintillators associated with photomultiplier and connected to Libera BLM dedicated electronics. This new detector should provide both fast (turn by turn) and slow (averaged) loss measurements, post mortem capabilities and should be less sensitive to the beam directivity compared to the pin-diodes. Different methods for a relative calibration of the modules are under investigation, either using a diode (LED) or a cesium radioactive source. Calibration results and first measurements with beam are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPA03  
About • paper received ※ 05 September 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, operation, 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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TUPA08 Arc Discharge Detectors for the CiADS Superconducting RF Cavities hardware, software, cavity, electron 228
 
  • Z.P. Xie, Y.K. Ding, J. Liang, H. Liu
    Hohai University, Nanjing, People’s Republic of China
  • Y. He, Y.M. Li
    IMP/CAS, Lanzhou, People’s Republic of China
 
  Funding: Work supported by the National Natural Science Foundation of China (Grant No.11505255, No.91026001) and the Fundamental Research Funds for the Chinese Central Universities(2015B29714)
Arc discharge due to the electron emission is one of the key issues in the CW superconducting RF(SRF) for the CiADS particle accelerator. Arc discharges can deteriorate the SRF cavities and damage the facility. Monitoring arc discharges is important for the purpose of machine protection. In this paper, an arc discharge detector has been designed to provide fast response upon events of arc discharge using open-source hardware and LabVIEW software. Electronic design techniques are described to enhance the system stability while utilizing the flexibility of embedded electronics. The proposed detector system gives about 700 ns of response time and it employs a LabVIEW based graphic user interface. The system has the capability of detecting the instantaneous arc discharge events in real time. Timestamps of the event will be recorded to assist beam diagnostics. This paper describes the hardware/software implementation and concludes with initial results of tests at CiADS.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPA08  
About • paper received ※ 04 September 2018       paper accepted ※ 11 September 2018       issue date ※ 29 January 2019  
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TUPA14 Beam Loss Monitoring in the ISIS Synchrotron Main Dipole Magnets dipole, synchrotron, controls, radiation 236
 
  • D.M. Harryman, S.A. Fisher, W.A. Frank, B. Jones, A. Pertica, D.W. Posthuma de Boer, C.C. Wilcox
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
 
  Beam loss monitoring at the ISIS Neutron and Muon Source is primarily carried out with the use of gas ionisation chambers filled with argon. These chambers are 3 to 4m long and are positioned around the inside of the synchrotron as well as along the ISIS Linac and Extracted Proton Beamlines (EPBs). To achieve finer spatial resolution a programme has been implemented to install six scintillator Beam Loss Monitors (BLMs), each 300 mm long, inside each of the ten main dipole magnets. Using these scintillator BLMs the accelerator can be fine-tuned during set-up to reduce areas of beam loss that were previously unseen or hard to characterise. As the installation programme comes to an end, this paper will review: the installation of the scintillator BLMs, the electronic hardware and software used to control them, and the initial measurements that have been taken using them.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-TUPA14  
About • paper received ※ 05 September 2018       paper accepted ※ 11 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, operation 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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TUPC03 Beam Quality Monitoring System in the HADES Experiment at GSI Using CVD Diamond Material monitoring, electron, experiment, electronics 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  
About • paper received ※ 05 September 2018       paper accepted ※ 13 September 2018       issue date ※ 29 January 2019  
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TUPC09 Initial Results from the LHC Multi-Band Instability Monitor operation, 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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WEOA03 First Electro-Optical Bunch Length Measurements from the European XFEL laser, electron, FEL, optics 338
 
  • B. Steffen, M.K. Czwalinna, C. Gerth, P. Peier
    DESY, Hamburg, Germany
 
  Three electro-optical bunch length detection systems based on spectral decoding have been installed and are being commissioned at the European XFEL. The systems are capable of recording individual longitudinal bunch profiles with sub-picosecond resolution at a bunch repetition rate 1.13 MHz. Bunch lengths and arrival times of entire bunch trains with single-bunch resolution have been measured as well as jitter and drifts for consecutive bunch trains. In this paper, we present first measurement results for the electro-optical detection system located after the second bunch compressor. A preliminary comparison with data from the bunch arrival-time monitor shows good agreement.  
slides icon Slides WEOA03 [4.496 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEOA03  
About • paper received ※ 05 September 2018       paper accepted ※ 12 September 2018       issue date ※ 29 January 2019  
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WEOB01 New Beam Loss Detector System for EBS-ESRF SRF, injection, operation, 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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WEOC02 Review of Recent Status of Coded Aperture X-ray Monitors for Beam Size Measurement optics, emittance, electron, MMI 361
 
  • J.W. Flanagan
    KEK, Ibaraki, Japan
 
  Funding: US-Japan Cooperation in High Energy Physics (Japan Monbukagakusho and US DOE). Kakenhi.
X-ray beam profile monitors based on coded aperture imaging use an array of pinholes or slits to achieve large open apertures, which provide improved photon collection efficiency over single pinholes or slits. The resulting improvement in photon statistics makes possible single-bunch, single-turn measurements at lower bunch currents than are possible with a single pinhole or slit. In addition, the coded aperture pattern provides extra information for beam profile reconstruction, which makes possible somewhat improved resolution, as compared to a single slit. The reconstruction algorithm for coded aperture imaging is more complicated and computing-intensive than that for a single slit, though with certain classes of coded pertures a faster reconstruction method is possible. This talk will provide a survey of efforts to use coded aperture imaging for beam profile diagnostics at accelerators to date, covering principles and practical experiences with the technique, as well as prospects for the future at SuperKEKB, where it forms the primary means of measuring vertical beam sizes.
 
slides icon Slides WEOC02 [4.065 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEOC02  
About • paper received ※ 12 September 2018       paper accepted ※ 24 September 2018       issue date ※ 29 January 2019  
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WEPA06 Thermal Coefficient of Delay Measurement of the New Phase Stable Optical Fiber controls, laser, power-supply, data-acquisition 383
 
  • L. Liu, X. Ma, G. Pei
    IHEP, Beijing, People’s Republic of China
 
  The Thermal Coefficient of Delay (TCD) is an essen-tial parameter of optical fiber which determines a fiber’s phase transfer stability due to temperature variation. The TCD of a new phase stable single mode optical fiber (YPSOC) from Yangtze Optical Fibre and Cable Compa-ny (YOFC) is measured. The radio frequency (RF) signal is modulated to optical wave by a laser module which is transmitted through the 400-meter long YPSOC to be measured. The returned optical wave is demodulated to RF signal by the photodetector. A phase detector and a data acquisition module (DAQ) are used to acquire the phase difference between the forward and returned sig-nals. Two temperature-stabilized cabinets are designed to maintain and control the ambient temperature of the measurement system. The TCD of less than 10ps/km/K at room temperature is obtained. YPSOC and the meas-urement platform can be applied on signal transmission or measurement system that need to compensate the temperature drift.  
poster icon Poster WEPA06 [0.653 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPA06  
About • paper received ※ 03 September 2018       paper accepted ※ 12 September 2018       issue date ※ 29 January 2019  
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WEPB02 Development of a a YAG/OTR Monitor photon, diagnostics, background, target 429
 
  • R.J. Yang, P. Bambade, S. Wallon
    LAL, Orsay, France
  • A. Aryshev, T. Naito, N. Terunuma
    KEK, Ibaraki, Japan
  • M. Bergamaschi
    CERN, Geneva, Switzerland
 
  To study the mechanisms of beam halo formation and its dynamics, a YAG/OTR monitor has been developed and tested at the KEK-ATF. The monitor has four ceramic Ce:YAG screens for the visualization of the beam core and beam halo and an OTR target to provide complementary measurements of beam core. A high dynamic range (DNR>105) and a high resolution (<10 um) have been demonstrated through the optimization of light detection, reduction of background and suppression of scintillation saturation. Measurements using this monitor are consistent with previous results and theoretical modeling of beam halo at ATF, and have allowed further progress in the characterization of the driving mechanisms.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPB02  
About • paper received ※ 04 September 2018       paper accepted ※ 24 September 2018       issue date ※ 29 January 2019  
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WEPB13 Beam-Gas Imaging Measurements at LHCb luminosity, experiment, vacuum, injection 459
 
  • G.R. Coombs, M. Ferro-Luzzi, R. Matev
    CERN, Meyrin, Switzerland
 
  The LHCb detector is one of the four large particle physics experiments situated around the LHC ring. The excellent spatial resolution of the experiment’s vertex locator (VELO) and tracking system allows the accurate reconstruction of interactions between the LHC beam and either residual or injected gas molecules. These reconstructed beam-gas interactions gives LHCb the ability, unique among experiments, to measure the shape and the longitudinal distribution of the beams. Analysis methods were originally developed for the purpose of absolute luminosity calibration, achieving an unprecedented precision of 1.2% in Run I. They have since been extended and applied for online beam-profile monitoring that is continuously published to the LHC, for dedicated cross-calibration with other LHC beam profile monitors and for studies of the dynamic vacuum effects due to the proximity of the VELO subdetector to the beam. In this talk, we give an overview of the LHCb experience with beam-gas imaging techniques, we present recent results on the outlined topics and we summarise the developments that are being pursued for the ultimate understanding of the Run II measurements.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPB13  
About • paper received ※ 05 September 2018       paper accepted ※ 12 September 2018       issue date ※ 29 January 2019  
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WEPB15 A Multipurpose Scintillating Fibre Beam Monitor for the Measurement of Secondary Beams at CERN experiment, electron, electronics, secondary-beams 468
 
  • I. Ortega Ruiz, L. Fosse, J. Franchi, A. Frassier, J. Fullerton, J. Kral, J. Lauener, T. Schneider, J. Spanggaard, G. Tranquille
    CERN, Meyrin, Switzerland
 
  A scintillating fibre beam monitor has been developed at CERN for the measurement of low energy and low intensity secondary beams. This monitor can track the passage of individual particles up to intensities of 107 particles per second per mm2, over an active area of 20 cm x 20 cm, and with a spatial resolution of 1 mm. Thanks to an external trigger system, the achieved detection efficiency is 95% and the noise level is kept below 10-4 events/second. The simple design of this monitor avoids the common production difficulties of scintillating fibre detectors and makes its maintenance easier, when compared to other tracking detectors, due to the absence of gas or cooling. Using special electronics, a version of the monitor can also be used for time-of-flight measurements, achieving a time resolution of 900 ps. Thanks to its versatility, the monitor will perform several functions when measuring the secondary beams of the CERN Neutrino Platform: beam profile, position and intensity measurement, magnetic momentum spectrometry, particle identification through time-of-flight, and trigger generation for the experiments.  
poster icon Poster WEPB15 [1.172 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPB15  
About • paper received ※ 03 September 2018       paper accepted ※ 14 September 2018       issue date ※ 29 January 2019  
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WEPC05 The European XFEL Wire Scanner System FEL, optics, collimation, undulator 498
 
  • T. Lensch, S. Liu, M. Scholz
    DESY, Hamburg, Germany
 
  The European-XFEL (E-XFEL) is an X-ray Free Electron Laser facility located in Hamburg (Germany). The superconducting accelerator for up to 17.5 GeV electrons will provide photons simultaneously to several user stations. Currently 12 Wire Scanner units are used to image transverse beam profiles in the high energy sections. These scanners provide a slow scan mode which is currently used to measure beam emittance and beam halo distributions. When operating with long bunch trains (>100 bunches) also fast scans are planned to measure beam sizes in an almost nondestructive manner. Scattered electrons can be detected with regular Beam Loss Monitors (BLM) as well as dedicated wire scanner detectors. Latter are installed in different variants at certain positions in the machine. Further developments are ongoing to optimize the sensitivity of the detectors to be able to measure both, beam halo and beam cores within the same measurement with the same detector. This paper describes the current status of the system and examples of different slow scan measurements.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC05  
About • paper received ※ 05 September 2018       paper accepted ※ 11 September 2018       issue date ※ 29 January 2019  
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WEPC06 The New Diagnostic Suite for the Echo Enabled Harmonic Generation Experiment at FERMI laser, electron, FEL, diagnostics 501
 
  • M. Veronese, A. Abrami, E. Allaria, M. Bossi, I. Cudin, M.B. Danailov, R. De Monte, M. Ferianis, F. Giacuzzo, S. Grulja, G. Kurdi, P. Rebernik Ribič, R. Sauro, G. Strangolino
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
 
  The Echo Enabled Harmonic Generation (EEHG) experiment has been implemented on the FEL2 line of the FERMI FEL at Elettra (Italy). The main purpose is to validate the expected performance improvements at short wavelengths before a dedicated major upgrade is deployed. This paper describes the new diagnostics and the operational experience with them during the EEHG experiment. By means of a multi position vacuum vertical manipulator, different optical components are positioned on the electron and seed laser path. Both transverse and longitudinal measurements are performed. A YAG:Ce screen (e beam) and a terbium doped UV scintillator (laser) are imaged on a dedicated CMOS camera. For the temporal alignment, an OTR screen and a scattering surface are used to steer radiation from the e-beam and laser, onto a fast photodetector. Also coherent OTR radiation, due to micro-bunching, is acquired by means of a PbSe photodetector. Finally, for the normal EEHG operation, the laser beam is injected on the electron beam axis by means of a UV reflecting mirror. The results of the installed diagnostics commissioning are here presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-WEPC06  
About • paper received ※ 05 September 2018       paper accepted ※ 13 September 2018       issue date ※ 29 January 2019  
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