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@inproceedings{brinker:ipac2021-thpab080,
author = {F. Brinker and S. Casalbuoni and W. Freund},
title = {{Correcting the Magnetic Field Offsets Inside the Undulators of the EuXFEL Using the K-Monochromator}},
booktitle = {Proc. IPAC'21},
pages = {3953--3955},
eid = {THPAB080},
language = {english},
keywords = {undulator, FEL, radiation, electron, synchrotron},
venue = {Campinas, SP, Brazil},
series = {International Particle Accelerator Conference},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
issn = {2673-5490},
isbn = {978-3-95450-214-1},
doi = {10.18429/JACoW-IPAC2021-THPAB080},
url = {https://jacow.org/ipac2021/papers/thpab080.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-THPAB080},
abstract = {{Hard X-ray free-electron lasers (XFELs) generate intense coherent X-ray beams by passing electrons through undulators, i.e. very long periodic magnet structures, which extend over hundreds of meters. A crucial condition for the lasing process is the spatial overlap of the electrons with the electromagnetic field. Well-established electron beam-based procedures allow finding a straight trajectory for the electrons defined by the beam position monitors (BPM) between the undulators. A bending of the trajectory in between the BPMs cannot be seen by these methods. A general field offset inside the undulators has the effect that the synchrotron radiation is emitted at a different angle at the beginning and the end of the undulator which can result in a degradation of the FEL-gain especially for very short wavelengths. We report on how the spectral and spatial characteristics of the monochromatized radiation of a single undulator can be used to minimize the field offset in situ with the help of correction coils.}},
}