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Kärkkäinen, M.

Paper Title Page
MOPLS066 Direct Measurement of Geometric and Resistive Wakefields in Tapered Collimators for the International Linear Collider 697
 
  • N.K. Watson, D. Adey, M.C. Stockton
    Birmingham University, Birmingham
  • D.A.-K. Angal-Kalinin, C.D. Beard, J.L. Fernandez-Hernando, F. Jackson
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • R. Arnold, R.A. Erickson, C. Hast, T.W. Markiewicz, S. Molloy, M.C. Ross, S. Seletskiy, A. Seryi, Z. Szalata, P. Tenenbaum, M. Woodley, M. Woods
    SLAC, Menlo Park, California
  • R.J. Barlow, A. Bungau, R.M. Jones, G.Yu. Kourevlev, A. Mercer
    UMAN, Manchester
  • D.A. Burton, J.D.A. Smith, A. Sopczak, R. Tucker
    Lancaster University, Lancaster
  • C. Densham, G. Ellwood, R.J.S. Greenhalgh, J. O'Dell
    CCLRC/RAL, Chilton, Didcot, Oxon
  • Y.K. Kolomensky
    UCB, Berkeley, California
  • M. Kärkkäinen, W.F.O. Müller, T. Weiland
    TEMF, Darmstadt
  • N. Shales
    Microwave Research Group, Lancaster University, Lancaster
  • M. Slater
    University of Cambridge, Cambridge
  • I. Zagorodnov
    DESY, Hamburg
  • F. Zimmermann
    CERN, Geneva
 
  Precise collimation of the beam halo is required in the ILC to prevent beam losses near the interaction region that could cause unacceptable backgrounds for the physics detector. The necessarily small apertures of the collimators lead to transverse wakefields that may result in beam deflections and increased emittance. A set of collimator wakefield measurements has previously been performed in the ASSET region of the SLAC LINAC. We report on the next phase of this programme, which is carried out at the recently commissioned End Station A test facility at SLAC. Measurements of resistive and geometric wakefields using tapered collimators are compared with model predictions from MAFIA and GdfidL and with analytic calculations.