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Stettler, M. W.

Paper Title Page
WEPMN116 Plans for Precision RF Controls for FERMI@ELETTRA 2310
  • L. R. Doolittle, J. M. Byrd, A. Ratti, J. W. Staples, R. B. Wilcox
    LBNL, Berkeley, California
  • G. D'Auria, M. Ferianis, M. M. Milloch, A. Rohlev
    ELETTRA, Basovizza, Trieste
  • M. W. Stettler
    CERN, Geneva
  FERMI@ELETTRA is a 4th generation light source under construction at Sincrotrone Trieste. It will be operated as a seeded FEL driven by a warm S-band linac presently serving as the injector for the ELETTRA storage ring. Operation as an FEL driver places much more stringent specifications on control of the amplititude and phase of the RF stations than in its present operation. This paper describes a conceptual design of an upgrade to the RF controls to achieve these specifications. The system consists of a stabilized distribution of the master oscillator signal providing a reference to local digital RF controllers . The RF reference distribution system takes advantage of recent breakthroughs in optical techniques where stabilized fiber lasers are used to provide a very accurate control of RF phases over long distances. The RF controller is based on recent improvements on modern digital systems, using a 14-bit high speed digitizer in combination with an FPGA and high speed DAC. This paper also presents experimental results of early tests performed as a feasibility study of the system.