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TY - CONF AU - Gerth, C. AU - Lockmann, N.M. ED - Kim, Changbum ED - Schaa, Volker R. W. ED - Kim, Dong-Eon ED - Lee, Jaeyu TI - Bunch Compression Monitor Based on Coherent Diffraction Radiation at European XFEL and FLASH J2 - Proc. of IBIC2021, Pohang, Rep. of Korea, 24-28 May 2021 CY - Pohang, Rep. of Korea T2 - International Beam Instrumentation Conference T3 - 10 LA - english AB - Bunch compression monitors (BCMs) based on the detection of coherent diffraction radiation have been installed at the European XFEL for a beam-based stabilisation of the accelerating phases as well as monitoring of bunch lengths. The monitor systems comprise zero-bias Schottky and pyro-electric detectors in combination with low and high pass filters. The detector responses and filters are matched to the spectral ranges of the coherent part of the emitted diffraction radiation which is given by the particular beam energy and bunch lengths after each bunch compression stage. In this paper, we describe in detail the experimental setup of the BCMs. The last BCM has been calibrated with the help of a transverse deflecting structure to establish a (rms) bunch length monitor in the range of a few tens of femtoseconds, and results from compression scans are presented. To enable operation at megahertz repetition rates of the superconducting accelerator, a correction method for the signal pileup of the pyro-electric detectors has been applied. Installation of the same BCMs is foreseen at FLASH within the FLASH²⁰²⁰⁺ upgrade project. PB - JACoW Publishing CP - Geneva, Switzerland SP - 400 EP - 403 KW - electron KW - detector KW - FEL KW - operation KW - flattop DA - 2021/10 PY - 2021 SN - 2673-5350 SN - 978-3-95450-230-1 DO - doi:10.18429/JACoW-IBIC2021-WEPP14 UR - https://jacow.org/ibic2021/papers/wepp14.pdf ER -