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TY - CONF AU - Lamb, T. AU - Butkowski, Ł. AU - Felber, E.P. AU - Felber, M. AU - Fenner, M. AU - Jabłoński, S. AU - Kozak, T. AU - Müller, J.M. AU - Prędki, P. AU - Schlarb, H. AU - Sydlo, C. AU - Titberidze, M. AU - Zummack, F. ED - Bishofberger, Kip:Carlsten, Bruce (LANL, Los Alamos, NM, USA)[ORCID:0000-0001-5619-907X] ED - Schaa, Volker RW TI - Laser-to-RF Synchronization with Femtosecond Precision J2 - Proc. of FEL2017, Santa Fe, NM, USA, August 20-25, 2017 C1 - Santa Fe, NM, USA T2 - International Free Electron Laser Conference T3 - 38 LA - english AB - Optical synchronization systems are already in regular operation in many FELs, or they will eventually be implemented in the future. In FLASH and the European XFEL, phase-stable optical reference signals are provided by a pulsed optical synchronization system in order to achieve low timing jitter FEL performance. The generation of phase-stable RF signals from a pulsed optical synchronization system is still a field of active research. The optical reference module (REFM-OPT), designed at DESY for operation in both FELs, employs a laser-to-RF phase detector, based on an integrated Mach-Zehnder interferometer. The phase drift of the 1.3 GHz RF reference signals with respect to the optical pulses is measured and actively corrected within the REFM-OPT at multiple locations in the accelerator. Therefore the REFM-OPT provides phase stable 1.3 GHz RF reference signals at these locations. The short-term and long-term performance in the accelerator tunnel of the European XFEL is presented and carefully reviewed. PB - JACoW CP - Geneva, Switzerland SP - 407 EP - 410 KW - ion KW - FEL KW - laser KW - LLRF KW - operation DA - 2018/02 PY - 2018 SN - 978-3-95450-179-3 DO - 10.18429/JACoW-FEL2017-WEB04 UR - http://jacow.org/fel2017/papers/web04.pdf ER -