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Vogel, V.

Paper Title Page
WEPMN013 Testing of 10 MW Multibeam Klystrons for the European X-ray FEL at DESY 2077
 
  • V. Vogel
  • A. Cherepenko
    BINP SB RAS, Novosibirsk
  • S. Choroba, T. Froelich, T. G. Grevsmuehl, F.-R. Kaiser, V. V. Katalev, I. S. Sokolov, H. Timm
    DESY, Hamburg
  
  For the European XFEL project multibeam klystrons, which can produce RF power of 10 MW, at an RF frequency of 1.3 GHz, 1.5ms pulse length and 10Hz repetition rate, were chosen as RF power sources. So far three companies have produced this kind of new klystron. At DESY we installed a new test stand dedicated for testing this new type of RF power source. So far we have tested several tubes from Thales, Toshiba and CPI in our test stand. In this paper we give an overview of the test facilities and we summarize the current test results of the L-band multibeam klystrons (MBK).  
FRPMS049 Resolution of a High Performance Cavity Beam Position Monitor System 4090
 
  • S. Walston
  • S. T. Boogert
    Royal Holloway, University of London, Surrey
  • C. C. Chung, P. Fitsos, J. Gronberg
    LLNL, Livermore, California
  • J. C. Frisch, S. Hinton, J. May, D. J. McCormick, S. Smith, T. J. Smith, G. R. White
    SLAC, Menlo Park, California
  • H. Hayano, Y. Honda, N. Terunuma, J. Urakawa
    KEK, Ibaraki
  • Yu. G. Kolomensky, T. Orimoto
    UCB, Berkeley, California
  • P. Loscutoff
    LBNL, Berkeley, California
  • A. Lyapin, S. Malton, D. J. Miller
    UCL, London
  • R. Meller
    Cornell University, Department of Physics, Ithaca, New York
  • M. C. Ross
    Fermilab, Batavia, Illinois
  • M. Slater, M. Thomson, D. R. Ward
    University of Cambridge, Cambridge
  • V. Vogel
    DESY, Hamburg
  
  International Linear Collider (ILC) interaction region beam sizes and component position stability requirements will be as small as a few nanometers. It is important to the ILC design effort to demonstrate that these tolerances can be achieved – ideally using beam-based stability measurements. It has been estimated that RF cavity beam position monitors (BPMs) could provide position measurement resolutions of less than one nanometer and could form the basis of the desired beam-based stability measurement. We have developed a high resolution RF cavity BPM system. A triplet of these BPMs has been installed in the extraction line of the KEK Accelerator Test Facility (ATF) for testing with its ultra-low emittance beam. A metrology system for the three BPMs was recently installed. This system employed optical encoders to measure each BPM's position and orientation relative to a zero-coefficient of thermal expansion carbon fiber frame and has demonstrated that the three BPMs behave as a rigid-body to less than 5 nm. To date, we have demonstrated a BPM resolution of less than 20 nm over a dynamic range of ± 20 microns.