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TY - CONF AU - Di Mitri, S. AU - Spampinati, S. ED - Chin, Yong Ho ED - Zhao, Zhentang ED - Petit-Jean-Genaz, Christine ED - Schaa, Volker RW TI - Microbunching Instability Study in the Linac-Driven FERMI FEL Spreader Beam Line J2 - Proc. of FLS2018, Shanghai, China, 5-9 March 2018 C1 - Shanghai, China T2 - ICFA Advanced Beam Dynamics Workshop T3 - 60 LA - english AB - Suppression of microbunching instability (MBI) along high brightness electron beam delivery systems is a priority for Free Electron lasers (FELs) aiming at very narrow bandwidth. The impact of MBI on FEL spectral brilliance is aggravated by the growing demand for multi-user FEL facilities, which adopt multi-bend switchyard lines traversed by high charge density electron beams. This study provides practical guidelines to switchyards design largely immune to MBI, by focusing on the FERMI FEL Spreader line. First, two MBI analytical models [1, 2] are successfully benchmarked along the accelerator. Being the second model flexible enough to describe an arbitrary multi-bend line, and found it in agreement with particle tracking and experimental results, it was used to demonstrate that a newly proposed Spreader optics provides unitary MBI gain while preserving the electron beam brightness. PB - JACoW Publishing CP - Geneva, Switzerland SP - 108 EP - 112 KW - ion KW - linac KW - laser KW - FEL KW - electron DA - 2018/06 PY - 2018 SN - 978-3-95450-206-6 DO - 10.18429/JACoW-FLS2018-WEP2PT008 UR - http://jacow.org/fls2018/papers/wep2pt008.pdf ER -