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@inproceedings{gerth:ibic2021-wepp14,
author = {C. Gerth and N.M. Lockmann},
title = {{Bunch Compression Monitor Based on Coherent Diffraction Radiation at European XFEL and FLASH}},
booktitle = {Proc. IBIC'21},
pages = {400--403},
eid = {WEPP14},
language = {english},
keywords = {electron, detector, FEL, operation, flattop},
venue = {Pohang, Rep. of Korea},
series = {International Beam Instrumentation Conference},
number = {10},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {10},
year = {2021},
issn = {2673-5350},
isbn = {978-3-95450-230-1},
doi = {10.18429/JACoW-IBIC2021-WEPP14},
url = {https://jacow.org/ibic2021/papers/wepp14.pdf},
note = {https://doi.org/10.18429/JACoW-IBIC2021-WEPP14},
abstract = {{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.}},
}