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@INPROCEEDINGS{Gtze:618817,
author = {Götze, Kathrin and Vagin, Pavel and Neumann, Paul and
Yamin, Sumera and Kekilli, Hasret and Tischer, Markus},
title = {{C}orrector coils with variable field direction for {FLASH}
2020},
journal = {Journal of physics / Conference Series},
volume = {3010},
number = {1},
issn = {1742-6588},
address = {Bristol},
publisher = {IOP Publ.},
reportid = {PUBDB-2024-07171},
pages = {012019},
year = {2025},
note = {2025 J. Phys.: Conf. Ser. 3030},
abstract = {Despite thorough tuning of insertion devices for storage
rings or linear accelerators,a (usually gap dependent) kick
to the electron beam remains and has to becorrected with the
help of steerer coils. These small, resistive coils are
placed upstreamand downstream of an undulator and by varying
the strength and direction of the generatedmagnetic field,
they allow to deflect the beam by a small angle and to
consequentlycorrect its trajectory. For the upgrade of the
free-electron laser FLASH at DESY Hamburgwe have developed
compact and cost-efficient air-cooled steerer coils based on
asolid ferrite core around which four sub-coils are wound in
a particular geometry. Byenergizing these coils separately,
the deflecting field can be tuned and adapted to the
gapdependent kick. The ferrite core enhances the coil
strength by more than $50\%$ comparedto previous designs
enabling them to generate 0.53(0.44)Tmm for horizontal
(vertical)field at 1A while still making the steerer
suitable for use in a slow feedback system. However,due to
the proximity of some steerers to permanent magnet-based
phase shifters,significant cross-talk between the two
devices is introduced and needs to be mitigated.},
month = {Aug},
date = {2024-08-26},
organization = {15th International Conference on
Synchrotron Radiation Instrumentation,
Hamburg (Germany), 26 Aug 2024 - 30 Aug
2024},
cin = {FS-US},
ddc = {530},
cid = {I:(DE-H253)FS-US-20120731},
pnm = {621 - Accelerator Research and Development (POF4-621) / 6G2
- FLASH (DESY) (POF4-6G2)},
pid = {G:(DE-HGF)POF4-621 / G:(DE-HGF)POF4-6G2},
experiment = {EXP:(DE-H253)FLASH2020p-20221201},
typ = {PUB:(DE-HGF)16 / PUB:(DE-HGF)8},
doi = {10.1088/1742-6596/3010/1/012019},
url = {https://bib-pubdb1.desy.de/record/618817},
}