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Arnold, R.

Paper Title Page
WEOBAB01 Electromagnetic Background Tests for the ILC Interaction Point Feedback System 1970
 
  • P. Burrows, G. B. Christian, C. I. Clarke, B. Constance, A. F. Hartin, H. D. Khah, C. Perry, C. Swinson, G. R. White
    JAI, Oxford
  • R. Arnold, S. Molloy, S. Smith, G. R. White, M. Woods
    SLAC, Menlo Park, California
  • A. Kalinin
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
 
  We present results obtained with the T-488 experiment at SLAC Endstation A (ESA). A material model of the ILC extraction-line design was assembled and installed in ESA. The module includes materials representing the mask, beamline calorimeter, and first extraction quadrupole, encompassing a stripline interaction-point feedback system beam position monitor (BPM). The SLAC high-energy electron beam was used to irradiate the module in order to mimic the electromagnetic (EM) backgrounds expected in the ILC interaction region. The impact upon the performance of the feedback BPM was measured, and compared with detailed simulations of its expected response.  
slides icon Slides  
WEOCAB01 Design of the Beam Delivery System for the International Linear Collider 1985
 
  • A. Seryi, J. A. Amann, R. Arnold, F. Asiri, K. L.F. Bane, P. Bellomo, E. Doyle, A. F. Fasso, L. Keller, J. Kim, K. Ko, Z. Li, T. W. Markiewicz, T. V.M. Maruyama, K. C. Moffeit, S. Molloy, Y. Nosochkov, N. Phinney, T. O. Raubenheimer, S. Seletskiy, S. Smith, C. M. Spencer, P. Tenenbaum, D. R. Walz, G. R. White, M. Woodley, M. Woods, L. Xiao
    SLAC, Menlo Park, California
  • I. V. Agapov, G. A. Blair, S. T. Boogert, J. Carter
    Royal Holloway, University of London, Surrey
  • M. Alabau, P. Bambade, J. Brossard, O. Dadoun
    LAL, Orsay
  • M. Anerella, A. K. Jain, A. Marone, B. Parker
    BNL, Upton, Long Island, New York
  • D. A.-K. Angal-Kalinin, C. D. Beard, J.-L. Fernandez-Hernando, P. Goudket, F. Jackson, J. K. Jones, A. Kalinin, P. A. McIntosh
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • R. Appleby
    UMAN, Manchester
  • J. L. Baldy, D. Schulte
    CERN, Geneva
  • L. Bellantoni, A. I. Drozhdin, V. S. Kashikhin, V. Kuchler, T. Lackowski, N. V. Mokhov, N. Nakao, T. Peterson, M. C. Ross, S. I. Striganov, J. C. Tompkins, M. Wendt, X. Yang
    Fermilab, Batavia, Illinois
  • K. Buesser
    DESY, Hamburg
  • P. Burrows, G. B. Christian, C. I. Clarke, A. F. Hartin
    OXFORDphysics, Oxford, Oxon
  • G. Burt, A. C. Dexter
    Cockcroft Institute, Warrington, Cheshire
  • J. Carwardine, C. W. Saunders
    ANL, Argonne, Illinois
  • B. Constance, H. Dabiri Khah, C. Perry, C. Swinson
    JAI, Oxford
  • O. Delferriere, O. Napoly, J. Payet, D. Uriot
    CEA, Gif-sur-Yvette
  • C. J. Densham, R. J.S. Greenhalgh
    STFC/RAL, Chilton, Didcot, Oxon
  • A. Enomoto, S. Kuroda, T. Okugi, T. Sanami, Y. Suetsugu, T. Tauchi
    KEK, Ibaraki
  • A. Ferrari
    UU/ISV, Uppsala
  • J. Gronberg
    LLNL, Livermore, California
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto
  • W. Lohmann
    DESY Zeuthen, Zeuthen
  • L. Ma
    STFC/DL, Daresbury, Warrington, Cheshire
  • T. M. Mattison
    UBC, Vancouver, B. C.
  • T. S. Sanuki
    University of Tokyo, Tokyo
  • V. I. Telnov
    BINP SB RAS, Novosibirsk
  • E. T. Torrence
    University of Oregon, Eugene, Oregon
  • D. Warner
    Colorado University at Boulder, Boulder, Colorado
  • N. K. Watson
    Birmingham University, Birmingham
  • H. Y. Yamamoto
    Tohoku University, Sendai
 
  The beam delivery system for the linear collider focuses beams to nanometer sizes at the interaction point, collimates the beam halo to provide acceptable background in the detector and has a provision for state-of-the art beam instrumentation in order to reach the physics goals. The beam delivery system of the International Linear Collider has undergone several configuration changes recently. This paper describes the design details and status of the baseline configuration considered for the reference design.  
slides icon Slides  
THPMN079 Simulation of ILC Feedback BPM Signals in an Intense Background Environment 2889
 
  • A. F. Hartin, P. Burrows, G. B. Christian, C. I. Clarke, B. Constance, H. D. Khah, C. Perry, C. Swinson, G. R. White
    JAI, Oxford
  • R. Arnold, S. Molloy, S. Smith, M. Woods
    SLAC, Menlo Park, California
  • A. Kalinin
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
 
  Funding: This work is supported in part by the Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area", contract number RIDS-011899.

Experiment T-488 at SLAC, End Station A recorded distorted BPM voltage signals and an accurate simulation of these signals was performed. Geant simulations provided the energy and momentum spectrum of the incident spray and secondary emissions, and a method via image charges was used to convert particle momenta and number density into BPM stripline currents. Good agreement was achieved between simulated and measured signals. Further simulation of experiment T-488 with incident beam on axis and impinging on a thin radiator predicted minimal impact due to secondary emission. By extension to worst case conditions expected at the ILC, simulations showed that background hits on BPM striplines would have a negligible impact on the accuracy of beam position measurements and hence the operation of the FONT feedback system

 
THPMS038 Magnetic Measurements and Simulations of a 4-Magnet Dipole Chicane for the International Linear Collider 3085
 
  • R. Arnold, A. Fisher, C. Hast, Z. M. Szalata, M. Woods
    SLAC, Menlo Park, California
  • V. N. Duginov, S. A. Kostromin, N. A. Morozov
    JINR, Dubna, Moscow Region
  • H. J. Schreiber, M. Viti
    DESY Zeuthen, Zeuthen
 
  T-474 at SLAC is a prototype BPM-based energy spectrometer for the ILC. We describe magnetic measurements and simulations for the 4-magnet chicane used in T-474. The ILC physics program requires better than 100 part-per-million (ppm) accuracy for energy measurements, which necessitates better than 50 ppm accuracy for magnetic field integral measurements. A 4-dipole chicane is used in T-474 with mid-chicane dispersion of 5-mm and magnetic fields of ~1 kGauss; similar to the current ILC parameters. Stability, reproducibility and consistency of magnetic measurements, including magnetic field maps for the T-474 dipole magnets, are presented using a moving wire, rotating coil, NMR probe, Hall probe and low-field fluxgate magnetometer. Measurements from SLAC's Magnet Test Lab facility as well as in situ measurements in End Station A (ESA) are presented, including measurements of residual magnetic fields in the T-474 chicane between the chicane magnets. Results are provided for an operational mode with a 1-hour calibration cycle, where the chicane magnets are operated in both polarities and at near-zero field.  
THPMS041 Disruption of Particle Detector Electronics by Beam Generated EMI 3094
 
  • G. R. Bower, R. Arnold, M. Woods
    SLAC, Menlo Park, California
  • N. Sinev
    University of Oregon, Eugene, Oregon
  • Y. Sugimoto
    KEK, Ibaraki
 
  The possibility that beam generated electromagnetic interference (EMI) could disrupt the operation of particle detector electronics has been of some concern since the inception of short pulse electron colliders more than 30 years ago, Some instances have been reported where this may have occurred but convincing evidence has not been available. This possibility is of concern for the ILC. We have conducted test beam studies demonstrating that electronics disruption does occur using the vertex detector electronics from the SLD detector which ran at the SLC at SLAC. We present the results of those tests and we describe the need for EMI standards, for beam and detector instrumentation, at the ILC.  
FRPMN090 A Prototype Energy Spectrometer for the ILC at End Station A in SLAC 4285
 
  • A. Lyapin, F. Gournaris, B. Maiheu, D. J. Miller, M. Wing
    UCL, London
  • C. Adolphsen, R. Arnold, C. Hast, D. J. McCormick, Z. M. Szalata, M. Woods
    SLAC, Menlo Park, California
  • S. T. Boogert, G. E. Boorman
    Royal Holloway, University of London, Surrey
  • M. V. Chistiakova, Yu. G. Kolomensky, E. Petigura, M. Sadre-Bazzaz
    UCB, Berkeley, California
  • V. N. Duginov, S. A. Kostromin, N. A. Morozov
    JINR, Dubna, Moscow Region
  • M. Hildreth
    Notre Dame University, Notre Dame, Iowa
  • H. J. Schreiber, M. Viti
    DESY Zeuthen, Zeuthen
  • M. Slater, M. Thomson, D. R. Ward
    University of Cambridge, Cambridge
 
  The main physics programme of the international linear collider requires a measurement of the beam energy with a relative precision on the order of 10-4 or better. To achieve this goal a magnetic spectrometer using high resolution beam position monitors (BPM) has been proposed. A prototype spectrometer chicane using 4 dipole magnets is currently under development at the End Station A in SLAC, intending to demonstrate the required stability of this method and investigate possible systematic effects and operational issues. This contribution reports on the successful commissioning of the beam position monitor system and the resolution and stability achieved. Also, the initial results from a run with a full spectrometer chicane are presented.