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@inproceedings{pannek:ipac2021-frxa06,
author = {F. Pannek and S. Ackermann and E. Allaria and W. Hillert and P. Niknejadi and G. Paraskaki and M.A. Pop and D. Samoilenko and L. Schaper},
% author = {F. Pannek and S. Ackermann and E. Allaria and W. Hillert and P. Niknejadi and G. Paraskaki and others},
% author = {F. Pannek and others},
title = {{Mitigation of Beam Instabilities in the Echo-Enabled Harmonic Generation Beamline for FLASH²⁰²⁰⁺}},
booktitle = {Proc. IPAC'21},
pages = {4514--4517},
eid = {FRXA06},
language = {english},
keywords = {bunching, laser, electron, FEL, free-electron-laser},
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-FRXA06},
url = {https://jacow.org/ipac2021/papers/frxa06.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-FRXA06},
abstract = {{With the FLASH²⁰²⁰⁺ upgrade, one of the beamlines of the free-electron laser FLASH at DESY will be based on the Echo-Enabled Harmonic Generation (EEHG) seeding scheme and provide high-repetition-rate, coherent radiation down to 4 nm. To reach this wavelength, it is necessary to imprint intricate structures on the longitudinal phase space of the electron bunch at a very high harmonic of the seed laser wavelength, making the scheme potentially vulnerable to beam instabilities. Part of the beamline is a strong chicane, which is necessary to create the dispersion required by EEHG. Resulting effects such as Coherent Synchrotron Radiation (CSR) can be very detrimental for the bunching process and have to be taken into account already in the design of the beamline to ensure optimum FEL performance. We investigate and propose possible mitigation solutions to such instabilities in the FLASH²⁰²⁰⁺ parameter range.}},
}