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closed-orbit

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TUPB04 BPM detectors upgrade for the ELETTRA Fast Orbit Feedback feedback, electron, controls, diagnostics 60
 
  • M. Lonza, L. Battistello, D. Bulfone, R. De Monte, S. Fontanini, V. Forchi', G. Gaio, F. Giacuzzo, R. Marizza, R. Passuello, L. Pivetta, C. Scafuri
    ELETTRA, Basovizza, Trieste
  The project of a fast feedback system to stabilize the closed orbit of the Elettra storage ring is in an advanced stage. All of the existing BPMs have been equipped with new digital detectors in order to provide precise and high-rate position measurements to the feedback system. A new beam position interlock system has also been installed to protect the vacuum chamber from synchrotron radiation produced by insertion devices. This paper presents features and performance of the new orbit measurement system and reports some preliminary results of the feedback commissioning.  
 
TUPB22 Renewal of BPM Electronics of SPring-8 Storage Ring storage-ring, betatron, controls, emittance 114
 
  • S. Sasaki, T. Fujita, M. Shoji, T. Takashima
    JASRI/SPring-8, Hyogo-ken
  The signal processing electronics of the SPring-8 Storage Ring BPM were replaced during the summer shutdown period of the year 2006. Since then, the new electronics have been put into operation for user experiment runs. The purpose of the renewal was to upgrade the performance of the position measurement system, i.e. the position resolution, speed of the measurement, etc. The position resolution of them in the real operation condition was estimated by using the stored beam in the same condition as the operations for user experiments, in the following way. The closed orbit distortions (COD) were repeatedly measured with the interval of 4 seconds in order to obtain the root mean square (r.m.s.) values of differences between two consecutive measurements. Since the obtained r.m.s. values included the intrinsic resolution of the position measurement system and the effect of the beam motion, the effect of the beam motion was separated from the obtained r.m.s. data by assuming that the effect of the beam motion was proportional to the betatron function values at the BPM locations. As a result, the intrinsic resolution was estimated to be 0.1μmeters.