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Lee, W. W.

Paper Title Page
MOPAN060 Compensation of BPM Chamber Motion in PLS Orbit Feedback System 290
  • H.-S. Kang, J. Choi, K. M. Ha, E.-H. Lee, W. W. Lee, I. S. Park
    PAL, Pohang, Kyungbuk
  The false BPM reading resulting from the BPM vacuum chamber motion due to thermal load change by synchrotron radiation is compensated by the real-time monitoring of the chamber position in the PLS orbit feedback system. The BPM chamber moves up to 20 μm during the beam refill and the chamber motion has a time constant of about one and half hour, which is related to thermal equilibrium of the vacuum chamber. To monitor the BPM chamber motion, LVDTs with 0.2 μm reading accuracy were installed on all BPM chambers, and the measured data are used in the orbit feedback every 1 minute. In this paper, we will describe how serious the BPM chamber motion are and how well it is compensated.