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TY - CONF AU - Roussel, E. AU - Allaria, E. AU - Danailov, M.B. AU - Di Mitri, S. AU - Ferrari, E. AU - Gauthier, D. AU - Giannessi, L. AU - Penco, G. AU - Veronese, M. ED - Schaa, Volker RW ED - Arduini, Gianluigi ED - Pranke, Juliana ED - Seidel, Mike ED - Lindroos, Mats TI - New Scenarios of Microbunching Instability Control in Electron Linacs and Free Electron Lasers J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017 C1 - Copenhagen, Denmark T2 - International Particle Accelerator Conference T3 - 8 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 increase of the energy spread of the electron bunch. The heating suppresses longitudinal microbunching instability which otherwise would limit the FEL performance. We demonstrate that, through the action of the microbunching instability, a long-wavelength modulation of the electron beam induced by the laser heater at low energy can persist until the beam entrance into the undulators. This coherent longitudinal modulation is exploited to control the FEL spectral properties, in particular, multicolor extreme-ultraviolet FEL pulses can be generated through a frequency mixing of the modulations produced by the laser heater and the seed laser in the electron beam. We present an experimental demonstration of this novel configuration carried out at the FERMI FEL. PB - JACoW CP - Geneva, Switzerland SP - 3642 EP - 3644 KW - FEL KW - electron KW - laser KW - linac KW - controls DA - 2017/05 PY - 2017 SN - 978-3-95450-182-3 DO - 10.18429/JACoW-IPAC2017-THYA1 UR - http://jacow.org/ipac2017/papers/thya1.pdf ER -