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@inproceedings{xiao:ipac2021-tupab127,
author = {L. Xiao and C. Adolphsen and A. Cedillo and E.N. Jongewaard and X. Liu and C.-K. Ng and F. Zhou},
% author = {L. Xiao and C. Adolphsen and A. Cedillo and E.N. Jongewaard and X. Liu and C.-K. Ng and others},
% author = {L. Xiao and others},
title = {{Spare Gun Multi-Physics Analysis for LCLS-II}},
booktitle = {Proc. IPAC'21},
pages = {1688--1691},
eid = {TUPAB127},
language = {english},
keywords = {gun, cavity, cathode, simulation, electron},
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-TUPAB127},
url = {https://jacow.org/ipac2021/papers/tupab127.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-TUPAB127},
abstract = {{LBNL APEX VHF normal conducting gun was adopted for LCLS-II CW operation to provide ultra-bright high repetition rate X-ray pulses. The initial LCLS-II gun and injector commissioning showed excessive dark current dominated by field emission around the cathode plug outer diameter and the gun cavity nose. There is a concern that the dark current may get worse with time of operation. It is planning to build a spare rf gun largely based on the current LCLS-II gun to replace current LCLS-II gun. The proposed spare gun has a reduced the peak electrical fields around the cathode plug corner and cavity nose by 10% through further optimizing APEX gun cavity shape. In addition, there are some moderate modifications on the engineering design to increase mechanical robustness and vacuum performance. SLAC developed parallel finite-element electromagnetic code suite ACE3P is used to apply for the spare gun modeling including RF, thermal and structural analysis at static and transient states to ensure its successful operation in LCLS-II. In this paper, the spare gun multi-physics analysis is described.}},
}