Keyword: instrumentation
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MOOCA02 RF Design and Operation of a Modular Cavity for Muon Ionization Cooling R&D cavity, solenoid, vacuum, operation 42
 
  • Y. Torun
    IIT, Chicago, Illinois, USA
  • D.L. Bowring, M.A. Palmer, K. Yonehara
    Fermilab, Batavia, Illinois, USA
 
  Funding: Supported by the US Department of Energy Office of Science through the Muon Accelerator Program.
Ionization cooling channel designs call for the operation of high-gradient, normal-conducting RF cavities in multi-Tesla solenoidal magnetic fields. However, strong magnetic fields have been shown in some cases to limit the maximum achievable gradient in RF cavities. This gradient limit is characterized by RF breakdown and damage to the cavity surface. To study this issue, we have developed an experimental program at Fermilab's MuCool Test Area (MTA) based on a modular pillbox cavity operating at 805 MHz. The modular cavity design allows for the evaluation of different cavity geometries and materials – such as beryllium – which may ameliorate or circumvent RF breakdown triggers. We present a summary of recent results and plans for the future of the MTA normal conducting RF cavity program.
 
slides icon Slides MOOCA02 [32.552 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOOCA02  
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TUPRI079 Test Results of the Libera Sync 3 CW Reference Clock Transfer System detector, controls, FEL, operation 1751
 
  • P. Orel, E. Janezic, P.L. Lemut, S. Zorzut
    I-Tech, Solkan, Slovenia
  • S. Hunziker, V. Schlott
    PSI, Villigen PSI, Switzerland
 
  The new Libera Sync 3 CW reference clock transfer system has been specifically designed to meet the strict requirements of the latest fourth generation light sources, such as the Swiss FEL. The system has been co-developed with the Paul Scherrer Institute (PSI). It has been produced and tested at Instrumentation Technologies (I-Tech) and later installed at PSI. In this article we give a general overview of the system and its functionalities. We also present a brief overview of the supporting products that have been developed in order to enable testing at the level of performance discussed. Finally, we focus on presenting some of the test results obtained at I-Tech and PSI showing the performance capabilities and limitations of the system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRI079  
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WEPME068 Mitigating Noise Sources in MTCA.4 Electronics for High Precision Measurements coupling, distributed, FPGA, simulation 2436
 
  • U. Mavrič, M. Hoffmann, F. Ludwig, H. Schlarb
    DESY, Hamburg, Germany
 
  The RF field detection instrumentation plays a crucial role in modern accelerator performance. The most critical section is the transition from the analog signal processing to the digitalization. In this paper we present state of the art performance of COTS components and limitations imposed by crate-oriented solutions. We give recipes on how to optimize performance and present some of the recent results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPME068  
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WEPRI057 RF Control and DAQ Systems for the Upgraded Vertical Test Facility at Fermilab cavity, controls, interface, coupling 2612
 
  • Y.M. Pischalnikov, R.H. Carcagno, F.L. Lewis, R. Nehring, R.V. Pilipenko, W. Schappert
    Fermilab, Batavia, Illinois, USA
 
  Funding: Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.
The Fermilab Vertical Cavity Test Facility (VCTF) [1] is a used to test production cavities prior to their installation in cryomodules and to characterize the performance of research cavities as part of the extensive SRF cavity R&D program at FNAL. The performance of a variety of SRF cavities (325MHz, 650MHz, 1300MHz; bare and dressed) can be measured at VCTF. Recently FNAL upgraded the facility by adding two additional test stands (VTS2&3) in preparation for production of cavities for two new linear accelerators (LCLS II and PIP II). This paper provides an overview of the design features, technical parameters and experience with first operation of the upgraded RF control and DAQ systems.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI057  
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WEPRI099 Testing of a Single 11 T Nb3Sn Dipole Coil Using a Dipole Mirror Structure dipole, quadrupole, pick-up, target 2728
 
  • A.V. Zlobin, N. Andreev, E.Z. Barzi, G. Chlachidze, V.V. Kashikhin, A. Nobrega, I. Novitski, D. Turrioni
    Fermilab, Batavia, Illinois, USA
  • M. Karppinen, D. Smekens
    CERN, Geneva, Switzerland
 
  Funding: Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy and European Commission under FP7 project HiLumi LHC, GA no.284404
FNAL and CERN are developing an 11 T Nb3Sn dipole suitable for installation in the LHC. To optimize coil design parameters and fabrication process and study coil performance, a series of 1 m long dipole coils is being fabricated. One of the short coils has been tested using a dipole mirror structure. This paper describes the dipole mirror magnetic and mechanical designs, and reports coil parameters and test results.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRI099  
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THPME003 A Precise Determination of the Core-halo Limit emittance, linac, space-charge, extraction 3208
 
  • P.A.P. Nghiem, N. Chauvin, D. Uriot, M. Valette
    CEA/DSM/IRFU, France
  • W. Simeoni
    IF-UFRGS, Porto Alegre, Brazil
 
  For high-intensity beams, the dynamics of the dense core is different from that of the much less dense halo. Relations between core emittance growth and halo generation are often studied, halo scraping often experienced and halo re-formation observed. For all that, a clear distinction between the core and the halo parts does not exist. This paper proposes a new method for precisely determining the core-halo limit applicable to any particle distribution type. Once this limit is known, the importance of the halo relative to the core can be precisely quantified. The core-halo limit determination may be easily extended to the nD phase space, allowing the definition of emittance and Twiss parameters for the core and the halo separately.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME003  
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THPME077 Complex Beam Profile Reconstruction, A Novel Rotating Array of Vibrating Wires vacuum, operation, extraction, detector 3415
 
  • S.G. Arutunian
    ANSL, Yerevan, Armenia
  • J.R. Alonso
    LBNL, Berkeley, California, USA
 
  Proton/ion beams of multiple charge/mass ratio can be very complex. Orthogonal X-Y projections are often inappropriate to represent these profiles. An array of vibrating wires, rotating around the beam axis is under development. The mechanical implementation is described. An algorithm to reconstruct the profile is proposed. The tradeoffs between the number of wires, the rotation angles, the response time and the profile resolution are discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME077  
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THPME096 Goubau Line Beam Instrumentation Testing, The Benefits resonance, electromagnetic-fields, impedance, electronics 3462
 
  • F. Stulle, J.F. Bergoz
    BERGOZ Instrumentation, Saint Genis Pouilly, France
  • J. Musson
    JLab, Newport News, Virginia, USA
 
  At JLab and Bergoz Instrumentation Goubau lines are used for beam instrumentation testing. A Goubau line differs fundamentally from standard bench testing techniques in the way it produces the electromagnetic fields which interact with the DUT. This allows to acquire complementary information about DUT characteristics. Consequently, we improve our knowledge about the DUT. At JLab BPM responses have been successfully mapped and at Bergoz Instrumentation high frequency behavior of current transformers is under study. We present results, highlight benefits and outline ideas for future studies of additional accelerator components.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME096  
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THPME129 Application of Libera Brilliance+ to Special Purpose BPMs in SuperKEKB brilliance, luminosity, positron, betatron 3544
 
  • S. Kanaeda, H. Fukuma, H. Ishii, K. Mori, M. Tobiyama
    KEK, Ibaraki, Japan
 
  The KEKB accelerator at KEK is being upgraded to SuperKEKB, and will be starting operation in 2015. SuperKEKB will have 444 Beam Position Monitors (BPMs) in the positron ring (LER), and 466 in the electron ring (HER). Two BPMs in each ring will be newly introduced for measuring fast beam orbit oscillations, and another two BPMs in each ring will be introduced for the fast beam orbit interlock at SuperKEKB. The required resolution is below several μm for fast beam orbit oscillation monitoring, and the requirement for the response time is less than 100 μs for the fast beam orbit interlock. We plan to use the Libera Brilliance+ from Instrumentation Technologies as signal processors for these special purpose BPMs. This paper discusses the application of the Libera Brilliance+ to these special purpose BPMs.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME129  
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THPME141 Design of Beam Intensity Measurement System in Injector for HLS II electron, linac, controls, monitoring 3581
 
  • C. Cheng, P. Lu, B.G. Sun, K. Tang, J. Xu, Y.L. Yang, Z.R. Zhou, J.Y. Zou
    USTC/NSRL, Hefei, Anhui, People's Republic of China
 
  A new beam intensity measurement (BIM) system has been developed and has been used in the upgrade project of HLS II. After the upgrading is accomplished, electron energy in Injector endpoint will increase from 200MeV to 800MeV to achieve the goal of top-off injector. Meanwhile, macro pulse width changes from 1us to 1ns and peak intensity from 50mA to 1A approximately. So three fast current transformers (FCTs) and two integrating current transformer (ICTs) are installed in Linac and Transport Line to measure single pass beam parameters. In this article, off-line calibration of beam transformer is elaborated. Since the fast pulse signals from beam transformer will be hugely distorted after they transmit from Injector vacuum chamber to the Injector beam diagnostic centre room after hundreds of meters long LMR-400 cable, signal recovery algorithm based on FFT/IFFT is used to re-appear the true original signal and calculate the calibration efficient. In the end, resolution and measurement result of the BIM system is presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME141  
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THPME176 CERN Antiproton Decelerator Beam Instrumentation for the ELENA Era antiproton, pick-up, operation, electron 3684
 
  • M. Ludwig, L. Bojtár, M.F. Fernandes, M. Gąsior, L. Søby, G. Tranquille
    CERN, Geneva, Switzerland
 
  CERN is currently constructing an Extra Low ENergy Antiproton ring (ELENA), which will allow the further deceleration of antiprotons from the currently exploited Antiproton Decelerator (AD). In order to meet the challenges of ELENA the beam instrumentation systems of the CERN AD are being consolidated and upgraded. An updated controls architecture with a more flexible timing system needs to be adopted and obsolete systems must be replaced. This paper presents the status and plans for improved performance and measurement availability of the AD beam instrumentation with a decreased risk of failure.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME176  
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THPRI022 The Accelerator Reliability Forum HOM, operation, controls, software 3813
 
  • A. Lüdeke
    PSI, Villigen PSI, Switzerland
  • R. Giachino
    CERN, Geneva, Switzerland
  • L. Hardy
    ESRF, Grenoble, France
 
  A high reliability is a very important goal for most particle accelerators. The biennial Accelerator Reliability Workshop covers topics related to the design and operation of particle accelerators with a high reliability. In order to optimize the over-all reliability of an accelerator one needs to gather information on the reliability of many different subsystems. While a biennial workshop can serve as a platform for the exchange of such information, the authors aimed to provide a further channel to allow for a more timely communication: the Particle Accelerator Reliability Forum (http://reliability.forumotion.com). This contribution will describe the forum and advertise it's usage in the community.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI022  
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THPRI071 Instrumentation for Characterizing 201-MHz MICE Cavity at Fermilab cavity, vacuum, pick-up, electron 3930
 
  • M. Chung, D.L. Bowring, A. Moretti, R.J. Pasquinelli, D.W. Peterson, R.P. Schultz
    Fermilab, Batavia, Illinois, USA
  • P.G. Lane, Y. Torun
    Illinois Institute of Technology, Chicago, Illinois, USA
  • L. Somaschini
    INFN-Pisa, Pisa, Italy
 
  A 201-MHz single cavity module is installed in the Mucool Test Area (MTA) of Fermilab to test the performance of the cavity at the design parameters for the International Muon Ionization Cooling Experiment (MICE) particularly in multi-Tesla external magnetic fields. To monitor various aspects of the cavity and to understand detailed physics involved in RF breakdown and multipacting, numerous instrumentation is installed on the cavity module and also in the experimental hall, which includes thermocouples, infrared sensors, electron pickups, fiber light guides, and radiation detectors. In this paper, we will present details of each diagnostic and initial test results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI071  
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