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TY - CONF AU - Li, Y. AU - Pflüger, J. ED - Chin, Yong Ho ED - Zhao, Zhentang ED - Petit-Jean-Genaz, Christine ED - Schaa, Volker RW TI - Undulator Phase Matching for the the European XFEL J2 - Proc. of FLS2018, Shanghai, China, 5-9 March 2018 C1 - Shanghai, China T2 - ICFA Advanced Beam Dynamics Workshop T3 - 60 LA - english AB - The undulator system in the European XFEL is mainly comprised 5-m long undulator segments and 1.1 m long intersections in between. In intersections the electron velocity is faster than it inside an undulator and the optical phase is detuned. The detune effect is also from the undulator fringe field where electron longitudinal speed also deviates from the oscillation condition. The total detune effect is compensated by a magnetic device called phase shifter, which is correspondingly set for a specific undulator gap. In this paper we introduce the method to set the phase shifter gap for each K parameter according to the measured magnetic field. PB - JACoW Publishing CP - Geneva, Switzerland SP - 103 EP - 107 KW - ion KW - undulator KW - FEL KW - electron KW - radiation DA - 2018/06 PY - 2018 SN - 978-3-95450-206-6 DO - 10.18429/JACoW-FLS2018-WEP2PT003 UR - http://jacow.org/fls2018/papers/wep2pt003.pdf ER -