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TY - UNPB AU - Min, C.-K. AU - Eom, I. AU - Hu, J. AU - Jung, S.H. AU - Kang, H.-S. AU - Kim, S.H. AU - Lee, H.-S. AU - Park, S.S. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Toward 10 fs Timing Stability of PAL-XFEL J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - PAL-XFEL demonstrates 20 fs jitter in e-bunch arrival time at the end of undulators and its pump-probe system, which is extremely useful for maintaining high stability of machine and time-resolved experiments with high time resolution. Our low phase noise timing system and high stability high power RF system enable this low jitter. Our measurement shows 10 fs jitter of e-bunch arrival time at the injector and it increased ~20 fs due to e-bunch energy variation. The possibility of improving the final jitter is described based on the optimization of bunch compressors and longitudinal feedback. PB - JACoW Publishing CP - Geneva, Switzerland ER -