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TY - UNPB AU - Faatz, B. ED - Chin, Yong Ho ED - Zhao, Zhentang ED - Petit-Jean-Genaz, Christine ED - Schaa, Volker RW TI - Optimizing of Electron Beam Distribution at European XFEL and FLASH J2 - Proc. of FLS2018, Shanghai, China, 5-9 March 2018 C1 - Shanghai, China T2 - ICFA Advanced Beam Dynamics Workshop T3 - 60 LA - english AB - As a rule, FELs have been single user machines. To distribute the electron beam with a fast kicker system between different undulators enables delivering beam to several users simultaneously. If it is done from RF pulse to RF pulse, it would decrease the number of bunches for each user. Therefore, it is planned at the European XFEL and already practice for several years at FLASH, to kick entire bunch trains within an RF pulse, thus delivering to both users the 10 Hz trains. It will be shown how the system has allowed long pulse trains for two users simultaneously and what has been done to keep the full flexibility within a bunch train not only in terms of wavelength, number of bunches and bunch separation, but also in bunch length needed to allow different users different FEL-pulse duration. PB - JACoW Publishing CP - Geneva, Switzerland ER -