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TY - CONF AU - Schulz, S. AU - Czwalinna, M.K. AU - Felber, M. AU - Fenner, M. AU - Gerth, C. AU - Kozak, T. AU - Lamb, T. AU - Lautenschlager, B. AU - Ludwig, F. AU - Mavrič, U. AU - Müller, J. AU - Pfeiffer, S. AU - Schlarb, H. AU - Schmidt, Ch. AU - Sydlo, C. AU - Titberidze, M. AU - Zummack, F. ED - Schaa, Volker R.W. ED - Decking, Winfried ED - Sinn, Harald ED - Geloni, Gianluca ED - Schreiber, Siegfried ED - Marx, Michaela TI - Few-Femtosecond Facility-Wide Synchronization of the European XFEL J2 - Proc. of FEL2019, Hamburg, Germany, 26-30 August 2019 CY - Hamburg, Germany T2 - Free Electron Laser Conference T3 - 39 LA - english AB - The first facility-wide evaluation of the optical synchronization system at the European XFEL resulted in excellent arrival time stability of the electron bunches at the end of the 2 km long linac, being measured with two individual adjacent femtosecond-resolution bunch arrival time monitors. While each of the monitors is independently linked by a stabilized optical fiber to a master laser oscillator, with one being installed in the injector area and one in the experimental hall, these two reference lasers are tightly synchronized through another few-km long fiber link. Thus, not only the accelerator performance is being benchmarked, but equally the optical synchronization infrastructure itself. Stability on this level can only be achieved by locking the RF for cavity field control to the optical reference and requires an unprecedented synchronization of the master laser oscillator to the main RF oscillator, enabled by a novel RF/optical phase detector. Finally, with the seeders of the experiment’s optical lasers synchronized to the master laser oscillator, first experiments at two independent scientific instruments proved an X-ray/optical timing jitter of few tens of femtoseconds. PB - JACoW Publishing CP - Geneva, Switzerland SP - 318 EP - 321 KW - laser KW - FEL KW - electron KW - FEM KW - timing DA - 2019/11 PY - 2019 SN - "" SN - 978-3-95450-210-3 DO - doi:10.18429/JACoW-FEL2019-WEB04 UR - http://jacow.org/fel2019/papers/web04.pdf ER -