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power-supply

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IT04 Fast Positional Global Feedback for Storage Rings feedback, closed-orbit, dipole, damping 7
 
  • E. Plouviez
    ESRF, The European Synchrotron Radiation Facility, Grenoble, France
  Stability of the closed orbit of a storage ring is limited by the stability of the components defining this orbit: magnets position and field values. Measurements of the variation of the stored beam orbit with respect to a nominal orbit and application of orbit correction derived from these measurements can reduce these distortions. The subject of this talk is the implementation of such correction at high frequencies (up to about 100 Hz) using global correction schemes. The basic theoretical aspects of the problem will be presented:
  • Global versus local scheme
  • Feedback loop dynamics.
The technical problems associated with the implementation of such systems will also be addressed:
  • BPM and correctors design
  • Feedback loop electronic design
  
 
PS20 A current digitizer for ionisation chambers/SEMS with high resolution and fast resoponse ion, electron, pick-up, monitoring 147
 
  • H. Reeg
    GSI, Gesellschaft für Schwerionenforschung, Darmstadt, Germany
  A current-to-frequency converter (CFC), recently developed, exhibits a response time up to the ms region. The frequency limit is raised beyond 1 MHz, extending the linear range by a factor of 100. The conversion factor reaches 10-13 C/pulse. The converter is employed, combined with ionization chambers (IC) and secondary electron emission monitors (SEM), to measure the intensity of the extracted beam in the transfer lines adjoining GSI's heavy ion synchrotron (SIS). Fast intensity fluctuations during the particle spill can be observed. Reduced hum and noise pickup, better handling and mounting flexibility as well as reduced costs are achieved building up the spill monitoring system with distributed components.