Development of a high-resolution cavity-beam position monitor

Yoichi Inoue, Hitoshi Hayano, Yosuke Honda*, Toshikazu Takatomi, Toshiaki Tauchi, Junji Urakawa, Sachio Komamiya, Tomoya Nakamura, Tomoyuki Sanuki, Eun San Kim, Seung Hwan Shin, Vladimir Vogel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)


We have developed a high-resolution cavity-beam position monitor (BPM) to be used at the focal point of the ATF2, which is a test beam line that is now being built to demonstrate stable orbit control at ∼nanometer resolution. The design of the cavity structure was optimized for the Accelerator Test Facility (ATF) beam in various ways. For example, the cavity has a rectangular shape in order to isolate two dipole modes in orthogonal directions, and a relatively thin gap that is less sensitive to trajectory inclination. A two stage homodyne mixer with highly sensitive electronics and phase-sensitive detection was also developed. Two BPM blocks, each containing two cavity BPMs, were installed in the existing ATF beam line using a rigid support frame. After testing the basic characteristics, we measured the resolution using three BPMs. The system demonstrated 8.7 nm position resolution over a dynamic range of 5μm.

Original languageEnglish
Article number062801
JournalPhysical Review Special Topics - Accelerators and Beams
Issue number6
Publication statusPublished - 2008 Jun 16
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)
  • Surfaces and Interfaces


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