TY - CPAPER
AU - Ferrari, E.
AU - Allaria, E.
AU - Danailov, M.B.
AU - De Ninno, G.
AU - Di Mitri, S.
AU - Gauthier, D.
AU - Giannessi, L.
AU - Penco, G.
AU - Roussel, E.
AU - Veronese, M.
TI - Influence of a Non-Uniform Longitudinal Heating on High Brightness Electron Beams for FEL
J2 - Proc. of FEL2015
AB - Laser-heater systems are essential tools to control and optimize high-gain free electron lasers (FELs), working in the x-ray wavelength range. Indeed, these systems induce a controllable heating of the energy spread of the electron bunch. The heating allows in turn to suppress longitudinal microbunching instabilities limiting the FEL performance. In this communication, we show that a long-wavelength energy modulation of the electron beam induced by the laser heater can be preserved until the beam entrance in the undulators, affecting the FEL emission process. This non-uniform longitudinal heating can be exploited to investigate the electron- beam microbunching in the linac, as well as to control the FEL spectral properties. Here, we present experimental, analytical and numerical studies carried out at FERMI.
PB - JACoW
CY - Geneva, Switzerland
ER -