Plans for precision RF controls for FERMI@ELETTRA

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 amplitude and phase of the RF stations than in its present operation. This paper describes a conceptual design of new 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 controller is based on recent improvements on modern digital systems, using a 16-bit high speed digitizer in combination with an FPGA and high speed DAC.