Physical Review Special Topics. Accelerators and Beams (Apr 2012)

Cavity beam position monitor system for the Accelerator Test Facility 2

  • Y. I. Kim,
  • R. Ainsworth,
  • A. Aryshev,
  • S. T. Boogert,
  • G. Boorman,
  • J. Frisch,
  • A. Heo,
  • Y. Honda,
  • W. H. Hwang,
  • J. Y. Huang,
  • E-S. Kim,
  • S. H. Kim,
  • A. Lyapin,
  • T. Naito,
  • J. May,
  • D. McCormick,
  • R. E. Mellor,
  • S. Molloy,
  • J. Nelson,
  • S. J. Park,
  • Y. J. Park,
  • M. Ross,
  • S. Shin,
  • C. Swinson,
  • T. Smith,
  • N. Terunuma,
  • T. Tauchi,
  • J. Urakawa,
  • G. R. White

DOI
https://doi.org/10.1103/PhysRevSTAB.15.042801
Journal volume & issue
Vol. 15, no. 4
p. 042801

Abstract

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The Accelerator Test Facility 2 (ATF2) is a scaled demonstrator system for final focus beam lines of linear high energy colliders. This paper describes the high resolution cavity beam position monitor (BPM) system, which is a part of the ATF2 diagnostics. Two types of cavity BPMs are used, C-band operating at 6.423 GHz, and S-band at 2.888 GHz with an increased beam aperture. The cavities, electronics, and digital processing are described. The resolution of the C-band system with attenuators was determined to be approximately 250 nm and 1 μm for the S-band system. Without attenuation the best recorded C-band cavity resolution was 27 nm.