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TY - CONF AU - Roussel, E. AU - Allaria, E. AU - Danailov, M.B. AU - De Ninno, G. AU - Di Mitri, S. AU - Ferrari, E. AU - Gauthier, D. AU - Giannessi, L. AU - Penco, G. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - Influence of a Non-uniform Longitudinal Heating on High Brightness Electron Beams for FEL J2 - Proc. of IPAC2015, Richmond, VA, USA, May 3-8, 2015 C1 - Richmond, VA, USA T2 - International Particle Accelerator Conference T3 - 6 LA - english 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 persist 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 CP - Geneva, Switzerland SP - 1535 EP - 1537 KW - electron KW - laser KW - FEL KW - undulator KW - linac DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-TUPWA053 UR - http://jacow.org/ipac2015/papers/tupwa053.pdf ER -