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TY - UNPB AU - Kim, C. AU - Kang, H.-S. AU - Ko, I.S. AU - Min, C.-K. ED - Schaa, Volker RW TI - Femtosecond Synchronization of PAL-XFEL J2 - Proc. of IBIC2018, Shanghai, China, 9-13 September 2018 C1 - Shanghai, China T2 - International Beam Instrumentation Conference T3 - 7 LA - english AB - The PAL-XFEL achieved a 20 fs jitter in the bunch arrival time at the end of undulators and its pump-probe system, which is extremely useful for maintaining a high stability of machine and time-resolved experiments with high time resolution. A low phase noise timing system and high stability high power RF system enable this low jitter. The measurement result shows 10 fs jitter of bunch arrival time at the injector and it increased ~ 20 fs due to the bunch energy variation. The possibility of improving the final jitter is described based on the optimization of bunch compressors and a longitudinal feedback. PB - JACoW Publishing CP - Geneva, Switzerland ER -