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TY - CONF AU - Steffen, B. AU - Czwalinna, M.K. AU - Gerth, C. AU - Peier, P. ED - Schaa, Volker RW TI - First Electro-Optical Bunch Length Measurements from the European XFEL J2 - Proc. of IBIC2018, Shanghai, China, 09-13 September 2018 CY - Shanghai, China T2 - International Beam Instrumentation Conference T3 - 7 LA - english AB - Three electro-optical bunch length detection systems based on spectral decoding have been installed and are being commissioned at the European XFEL. The systems are capable of recording individual longitudinal bunch profiles with sub-picosecond resolution at a bunch repetition rate 1.13 MHz. Bunch lengths and arrival times of entire bunch trains with single-bunch resolution have been measured as well as jitter and drifts for consecutive bunch trains. In this paper, we present first measurement results for the electro-optical detection system located after the second bunch compressor. A preliminary comparison with data from the bunch arrival-time monitor shows good agreement. PB - JACoW Publishing CP - Geneva, Switzerland SP - 338 EP - 341 KW - laser KW - electron KW - FEL KW - optics KW - detector DA - 2019/01 PY - 2019 SN - 978-3-95450-201-1 DO - DOI: 10.18429/JACoW-IBIC2018-WEOA03 UR - http://jacow.org/ibic2018/papers/weoa03.pdf ER -