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MOPG10 BPM Stabiltiy Studies for the APS MBA Upgrade detector, ground-motion, diagnostics, vacuum 55
  • R.M. Lill, N. Sereno, B.X. Yang
    ANL, Argonne, Illinois, USA
  Funding: Work supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
The Advanced Photon Source (APS) is currently in the preliminary design phase for the multi -bend achromat (MBA) lattice upgrade. Beam stability is critical for the MBA and will require long term drift defined as beam motion over a seven-day timescale to be no more than 1 micron at the insertion device locations and beam angle change no more than 0.5 micro-radian. Mechanical stability of beam position monitor (BPM) pickup electrodes mounted on insertion device vacuum chambers place a fundamental limitation on long-term beam stability for insertion device beamlines. We present the design and implementation of using prototype mechanical motion system (MMS) instrumentation for quantifying this type of motion specifically in the APS accelerator tunnel and experiment hall floor under normal operating conditions. The MMS presently provides critical position information on the vacuum chamber and BPM support systems. Initial results of the R&D prototype systems have demonstrated that the chamber movements far exceed the long-term drift tolerance specified for the APS Upgrade MBA storage ring.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG10  
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MOPG12 A Wire-Based Methodology to Analyse the Nanometric Resolution of an RF Cavity BPM cavity, software, alignment, dipole 63
  • S. Zorzetti, K. Artoos, F.N. Morel, P. Novotny, D. Tshilumba, M. Wendt
    CERN, Geneva, Switzerland
  • L. Fanucci
    Università di Pisa, Pisa, Italy
  Funding: The PACMAN project is funded by the European Union's Seventh Framework Programme for research, technological development and demonstration under grant agreement no. 606839
Resonant Cavity Beam Position Monitors (RF-BPMs) are diagnostic instruments capable of achieving beam position resolutions down to the nanometre scale. To date, their nanometric resolution capabilities have been predicted by simulation and verified through beam-based measurements with particle beams. In the frame of the PACMAN project at CERN, an innovative methodology has been developed to directly observe signal variations corresponding to nanometric displacements of the BPM cavity with respect to a conductive stretched wire. The cavity BPM of this R&D study operates at the TM110 dipole mode frequency of 15GHz. The concepts and details of the RF stretched wire BPM test-bench to achieve the best resolution results are presented, along with the required control hardware and software.
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG12  
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MOPG58 Coherent Diffraction Radiation Imaging Methods to Measure RMS Bunch electron, radiation, detector, simulation 198
  • R.B. Fiorito, C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C.I. Clarke, A.S. Fisher
    SLAC, Menlo Park, California, USA
  • A.G. Shkvarunets
    UMD, College Park, Maryland, USA
  The measurement of the RMS bunch length with high resolution is very important for latest generation light sources and also a key parameter for the optimization of the final beam quality in high gradient plasma accelerators. In this contribution we present progress in the development of novel single shot, RMS bunch length diagnostic techniques based on imaging the near and far fields of coherent THz diffraction radiation (CTHzDR) that is produced as a charged particle beam interacts with a solid foil or an aperture. Recent simulation results show that the profile of a THz image of the coherent point spread function (CSF) of a beam whose radius is less than the PSF, i.e. the image produced by a single electron, is sensitive to bunch length and can thus be used as a diagnostic. The advantages and disadvantages of near field and far field imaging are examined and the results of a recent high energy (20 GeV) CTHzDR experiments at SLAC/FACET are presented. Plans for experiments to further validate and compare these imaging methods for both moderate and high energy charged particle beams are also discussed.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG58  
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TUPG20 The CMS Beam Halo Monitor at the LHC: Implementation and First Measurements detector, background, vacuum, luminosity 364
  • N. Tosi
    INFN-Bologna, Bologna, Italy
  A Cherenkov based detector system has been installed at the Large Hadron Collider (LHC), in order to measure the Machine Induced Background (MIB) for the Compact Muon Solenoid (CMS) experiment. The system is composed of forty identical detector units formed by a cylindrical Quartz radiator directly coupled to a Photomultiplier. These units are installed at a radius of 1.8m and a distance of 20.6 m from the CMS interaction point. The fast and direction-sensitive signal allows to measure incoming MIB particles while suppressing the much more abundant collision products and albedo particles, which reach the detector at a different time and from a different direction. The system readout electronics is based on the QIE10 ASIC and a uTCA based back-end, and it allows a continuous online measurement of the background rate separately per each bunch. The detector has been installed in 2015 and is now fully commissioned. Measurements demonstrating the capability of detecting anomalous beam conditions will be presented.
on behalf of the CMS collaboration
poster icon Poster TUPG20 [2.609 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG20  
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TUPG24 Online Total Ionisation Dosimeter (TID) Monitoring Using Semiconductor Based Radiation Sensors in the ISIS Proton Synchrotron radiation, synchrotron, proton, injection 379
  • D.M. Harryman, A. Pertica
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  During routine operation, the radiation levels in the ISIS proton synchrotron become high enough to permanently affect systems and electronics. This can potentially cause critical components to fail unexpectedly or denature over time, causing disruption for users of the ISIS facility or a loss of accuracy on a number of systems. To study the long term effects of ionising radiation on ISIS systems and electronics, the total dose received by such components must be recorded. A semiconductor based online Total Ionisation Dosimeter (TID) was developed to do this, using pin diodes and Radiation sensing Field Effect Transistors (RadFETs) to measure the total ionisation dose. Measurements are made by feeding the TIDs with a constant current, with the threshold voltage on each device increasing in relation to the amount of radiation that it has received. This paper will look at preliminary offline results using off the shelf Field Effect Transistors (FETs) and diodes, before discussing the development of the RadFET online monitor and the results it has gathered thus far. Finally the paper will look at future applications and studies that this type of monitor will enable.  
poster icon Poster TUPG24 [1.235 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG24  
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TUPG26 COSY BPM Electronics Upgrade electronics, hadron, hardware, synchrotron 383
  • C. Böhme, A.J. Halama, V. Kamerdzhiev
    FZJ, Jülich, Germany
  The Cooler Synchrotron COSY delivers proton and deuteron beams to the users since the early 90s. The experiments are carried out using the circulating beam as well as the beams extracted from the ring and delivered by three beamlines. The original BPM system still operational in the ring does not fulfill the requirements for new experiments. It utilizes cylindrical and shoe-box type diagonally cut capacitive pick-ups. The most signal processing is done the analog way. Additionally to its age and the increasing failure rate, the analog processing introduces large drifts in e.g. the offset, which regularly require a significant effort for manual calibration. Even then the drifts render it impossible to match the requirements of the planned JEDI experiment, which is an orbit with a maximum of 100 um RMS deviation. Therefore an upgrade of the readout electronics was decided. The decision process is described, the implications listed and the current status is reported.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG26  
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TUPG31 The Alignment of Convergent Beamlines at a New Triple Ion Beam Facility ion, target, laser, alignment 403
  • O.F. Toader, T. Kubley, F.U. Naab, E.E. Uberseder
    NERS-UM, Ann Arbor, Michigan, USA
  The Michigan Ion Beam Laboratory (MIBL) at the University of Michigan in Ann Arbor Michigan, USA, has recently upgraded its capabilities from a two accelerator to a three accelerator operation mode. The laboratory, equipped with a 3 MV Tandem, a 400 kV Ion Implanter and a 1.7 MV Tandem has also increased the number of available beamlines from three to seven with two more in the planning stages. The MIBL staff had to overcome multiple challenges during the physical alignment process of the accelerators, beamlines and experimental end-stages. Not only the position of the accelerators changed, but the target chambers were moved into a different room behind a 1 m thick concrete wall. At the same time, one beamline from each accelerator had to converge and connect to a single chamber at a precise angle. This setup allows researchers to conduct simultaneous dual and triple ion beam experiments. This work presents the details of building this new setup, with focus on the alignment process.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG31  
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TUPG40 The Cherenkov Detector for Proton Flux Measurement (CpFM) in the UA9 Experiment detector, proton, radiation, vacuum 430
  • S. Montesano, W. Scandale
    CERN, Geneva, Switzerland
  • F.M. Addesa, G. Cavoto, F. Iacoangeli
    INFN-Roma, Roma, Italy
  • L. Burmistrov, S. Dubos, V. Puill, W. Scandale, A. Stocchi
    LAL, Orsay, France
  The UA9 experiment at the CERN SPS investigates the possibility to use bent crystals to steer particles in high energy accelerators. In this framework the CpFM have been developed to measure the beam particle flux in different experimental situations. Thin movable fused-silica bars installed in the SPS primary vacuum and intercepting the incoming particles are used to radiate Cherenkov light. The light signal is collected outside the beam pipe through a quartz optical window by radiation hard PMTs. The PMT signal is readout by the WaveCatcher acquisition board, which provides count rate as well as waveform information over a configurable time window. A bundle of optical fibers can be used to transport the light signal far from the beam pipe, allowing to reduce the radiation dose to the PMT. A first version of the CpFM has been successfully commissioned during the data taking runs of the UA9 Experiment in 2015, while a second version has been installed in the TT20 extraction line of the SPS in 2016. In this contribution the design choices will be presented and the final version of the detector will be described in detail.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG40  
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TUPG41 Development of High Resolution Beam Current Measurement System for COSY-Jülich software, hardware, Ethernet, instrumentation 434
  • Y. Valdau, S. Mikirtytchiants, S. Trusov
    FZJ, Jülich, Germany
  • L. Eltcov
    Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany
  • P. Wuestner
    Forschungszentrum Jülich, Jülich, Germany
  An experiment to test the Time Reversal Invariance at COSY (TRIC) is under the preparation at the Forschungszentrum Jülich. This experiment requires a precise measurement of the beam life time. A high resolution beam current measurement system, based on Fast Current Transformer (FCT), is under the development for the COSY storage ring. The signal from the FCT is measured by a modern lock-in amplifier which is read out by a dedicated DAQ over an Ethernet. Additional instruments, equipped with Ethernet interface, can be implemented into this DAQ and read out synchronously with other systems necessary for the TRIC experiment. Relative resolution of 10-4, sufficient for the TRIC experiment, has been demonstrated at the test bench in the laboratory. Preliminary results of the system commissioning at COSY will be presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG41  
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WEPG45 Present Status of the Laser Charge Exchange Test Using the 3-MeV Linac in J-PARC laser, proton, linac, rfq 736
  • H. Takei, E. Chishiro, K. Hirano, Y. Kondo, S.I. Meigo, A. Miura, T. Morishita, H. Oguri, K. Tsutsumi
    JAEA/J-PARC, Tokai-mura, Japan
  The accelerator-driven system (ADS) is discussed as one of the efficient device to transmute long-lived nuclides. For the efficient transmutation of the minor actinide (MA), precise prediction of neutronic performance of ADS is indispensable. The Transmutation Physics Experimental Facility (TEF-P) aimed at obtaining experimental data for the accuracy improvement of neutronics evaluation of MA-loaded ADS. The critical assembly installed in TEF-P operates below 500 watt to prevent the excessive radio activation of assembly. For the separation of low power beam from J-PARC intense proton accelerator, the meticulous low power beam extraction method from high power proton beam is required. The laser charge exchange method (LCE) is originally developed to measure the proton beam profile and can be applied to the beam separation device for TEF-P. The LCE device consists of bright YAG-laser and laser transport system with beam position controllers. We performed the stability tests for laser power and position of exposure by no proton beam condition. The further LCE tests using negative 3-MeV proton linac in J-PARC will be conducted. In this paper, present status of LCE tests is presented.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG45  
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WEPG52 Laser Arrival Time Measurement and Correction for the SwissFEL Lasers laser, timing, gun, FEL 763
  • M.C. Divall, C.P. Hauri, S. Hunziker, A. Romann, A. Trisorio
    PSI, Villigen PSI, Switzerland
  SwissFEL will ultimately produce sub-fs X-ray pulses. Both the photo-injector laser and the pump lasers used for the experimental end stations therefore have tight requirements for relative arrival time to the machine and the X-rays. The gun laser oscillator delivers excellent jitter performance at ~20fs integrated from 10Hz-10MHz. The Yb:CaF2 regenerative amplifier, with an over 1km total propagation path, calls for active control of the laser arrival time. This is achieved by balanced cross-correlation against the oscillator pulses and a translation stage before amplification. The experimental laser, based on Ti:sapphire laser technology will use a spectrally resolved cross-correlator to determine relative jitter between the optical reference and the laser, with fs resolution. To be able to perform fs resolution pump-probe measurements the laser has to be timed with the X-rays with <10fs accuracy. These systems will be integrated into the machine timing and complemented by electron bunch and X-ray timing tools. Here we present the overall concept and the first results obtained on the existing laser systems.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG52  
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