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@inproceedings{lipka:ibic2021-mopp08,
author = {D. Lipka},
title = {{Design of a Cavity Beam Position Monitor for the FLASH 2020+ Undulator Intersection Project at DESY}},
booktitle = {Proc. IBIC'21},
pages = {44--47},
eid = {MOPP08},
language = {english},
keywords = {dipole, cavity, FEL, resonance, electron},
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-MOPP08},
url = {https://jacow.org/ibic2021/papers/mopp08.pdf},
note = {https://doi.org/10.18429/JACoW-IBIC2021-MOPP08},
abstract = {{The FLASH 1 beamline at DESY will be upgraded from fixed to variable gap undulators in the next years. For this the vacuum beamline has to be adapted. This reduces the inner diameter compared to the existing chamber. The vacuum components should fit to the new dimension to minimize transitions and therefore reduce wakefields which could interact with the electron beam and disturb the SASE effect. The electron beam position in the intersection of the undulators should be detected with a high resolution and a large charge dynamic range. Cavity BPMs are known to fulfill these requirements. The existing design with 10 mm inner diameter for the Eu-XFEL is reduced to 6 mm. Additional improvements are: widening of the dipole resonator waveguide to adapt to the dipole mode and antenna transmission. The resonator frequency of 3.3 GHz and loaded quality factor of 70 are maintained to use electronic synergies to other projects. The design considerations and simulation results of the cavity BPM will be presented.}},
}