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@inproceedings{marinov:ipac2021-thpab043,
author = {K.B. Marinov},
title = {{A Superconducting Undulator for CompactLight: Resistive Wall Wakefield Analysis}},
booktitle = {Proc. IPAC'21},
pages = {3841--3843},
eid = {THPAB043},
language = {english},
keywords = {undulator, wakefield, impedance, electron, FEL},
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-THPAB043},
url = {https://jacow.org/ipac2021/papers/thpab043.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-THPAB043},
abstract = {{The CompactLight project is an advanced X-ray FEL light source, with high-frequency, high-gradient linacs and compact undulators. Lower electron energies give higher energy efficiency and a smaller environmental footprint. The extremely short bunch lengths (few fs) and narrow undulator gaps (4 mm) drastically increase the impact of resistive wall wakefields on the lasing process. The longitudinal resistive wall wakefield impedance is calculated in the framework of the surface impedance approach, in accordance with anomalous skin effect (ASE) theory. The dependence of the electron energy loss factor and the correlated energy spread of the bunch on the residual resistivity ratio (RRR) for both copper and aluminum is much higher for long (100 fs) than for ultra-short (6 fs) bunches. This is due to a known property of the longitudinal wakefield impedance - the field acting on a single particle traversing a resistive vessel does not depend on the conductivity of the vessel. The wakefields generated by the ultra-short bunch are already close to that of a single-particle regime and this leads to interesting consequences which are discussed in the present work.}},
}