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

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


Dive into the research topics of 'Development of a high-resolution cavity-beam position monitor'. Together they form a unique fingerprint.

Cite this