Seminars Archive

Electron Beam Dynamics in FERMI@elettra

Abstract
The dynamics of electron beams involved in Free Electron Lasers (FELs) projects is an interplay between sources of 6-dimensional emittance dilution and methods of emittance preservation. Relatively long bunches are required for the FERMI harmonic cascade seeded FEL in order to accommodate the timing jitter and the seed provided by the bunch itself at each stage of the cascade. A high quality is required from such electron beams (small transverse emittance and small energy spread) together with a uniform distribution in time along the usable part of the bunch; nonlinearity in the longitudinal phase space and in the transverse planes are also issues. A complex dynamics is provided by the Coherent Synchrotron Radiation (CSR) generated in magnetic compressors. This talk reviews specific problems related to the electron beam dynamics in FERMI dominated by bunches of hundreds Ampere peak current and varying length (0.7 to 2 ps) in the presence of normal conducting linac wake fields . Methods implemented to minimize the 6-dimensonal phase space degradation are discussed.