BEAM-BASED FEEDBACKS FOR THE FERMI@Elettra FREE ELECTRON LASER*
نویسندگان
چکیده
FERMI@Elettra is a new 4-generation light source based on a single pass Free Electron Laser (FEL) providing high peak-power photon pulses. It consists of a 1.5-GeV normal-conducting linac working at 50 Hz repetition rate and two chains of undulators where the photon beams are produced with a seeded laser multistage mechanism. A number of control loops, some of them working on a shot-by-shot basis, are required to stabilize the crucial parameters of the beams. For this purpose, a generalized real-time framework integrated in the control system has been designed to flexibly and easily implement feedback loops using several monitoring and control variables. The paper discusses the requirements of the control loops and the implementation of the feedback framework. A slow feedback system developed to support the commissioning operations is also presented.
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