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Schulte, M. J.

Paper Title Page
MOPAS080 A Digital Ring Transverse Feedback Low-Level RF Control System 617
  • A. K. Polisetti, S. Assadi, C. Deibele, J. C. Patterson
    ORNL, Oak Ridge, Tennessee
  • R. C. McCrady
    LANL, Los Alamos, New Mexico
  • M. J. Schulte
    UW-Madison, Madison, Wisconsin
  A digital wide-band system for damping ring instabilities in an accelerator is presented. With increased beam intensity, the losses of an accumulator ring tend to increase due to the onset of various instabilities in the beam. An analog feedback damper system has been implemented at Los Alamos National Laboratory. This analog system, while functional, has certain limitations and a lack of programmability, which can be overcome by a digital solution. A digital feedback damper system is being designed through a collaborative effort by researchers at Oakridge National Laboratory, Los Alamos National Laboratory, and the University of Wisconsin. This system, which includes analog-to-digital converters, field programmable gate arrays and digital-to-analog converters can equalize errors inherent to analog systems, such as dispersion due to amplifiers/cables, gain mismatches, and timing adjustments. The digital system features programmable gains and delays, and programmable equalizers that are implemented using digital FIR and comb filters. The flexibility of the digital system allows it to be customized to implement different configurations and extended to address other diagnostic problems.  
WEXC01 Experimental Tests of a Prototype System for Active Damping of the E-P Instability at the LANL PSR 1991
  • C. Deibele, S. Assadi, V. V. Danilov, S. Henderson, M. A. Plum, A. K. Polisetti
    ORNL, Oak Ridge, Tennessee
  • J. M. Byrd
    LBNL, Berkeley, California
  • J. D. Gilpatrick, R. C. McCrady, J. F. Power, T. Zaugg
    LANL, Los Alamos, New Mexico
  • S.-Y. Lee
    IUCF, Bloomington, Indiana
  • M. T.F. Pivi
    SLAC, Menlo Park, California
  • M. J. Schulte, Z. P. Xie
    UW-Madison, Madison, Wisconsin
  Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U. S. Department of Energy under contract DE-AC05-00OR22725.

A prototype of an analog, transverse (vertical) feedback system for active damping of the two-stream (e-p) instability has been developed and successfully tested at the Los Alamos Proton Storage Ring (PSR). This talk describes the system configuration, results of several experimental tests and studies of system optimization along with studies of the factors limiting its performance.

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