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Title: Resonant excitation of high order modes in the 3.9 GHz cavity of the Linac Coherent Light Source

Abstract

Construction of the Linac Coherent Light Source II (LCLS-II) is underway for the world’s first hard x-ray free-electron laser. A central part of the LCLS-II project is a 4 GeV superconducting radio frequency electron linac that will operate in the continuous wave (cw) mode. The linac is segmented into four sections named as L0, L1, L2, and L3. Two 3.9 GHz cryomodules, each housing of eight third-harmonic cavities similar to the cavities developed for the European X-ray Free Electron Laser (XFEL), will be used in section L1 of the linac for linearizing the longitudinal beam profile. Here in this paper, we present a study of trapped high order modes (HOMs) excited by a cw electron beam in the third-harmonic cavities of the LCLS-II linac. A detailed comparison of the original XFEL design and the LCLS-II design with a modified end group is performed in order to estimate the effect of a reduced beam pipe aperture on the efficiency of HOM damping. Furthermore, we apply a statistical analysis of the eigenmode spectrum for the estimation of the probability of resonant HOM losses and influence of HOMs on beam dynamics.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1419707
Alternate Identifier(s):
OSTI ID: 1421534
Report Number(s):
FERMILAB-PUB-18-046-TD
Journal ID: ISSN 2469-9888; 1654421; TRN: US1801520
Grant/Contract Number:  
AC02-07CH11359; AC02-76SF00515
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 21; Journal Issue: 2; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Lunin, A., Khabiboulline, T., Solyak, N., Sukhanov, A., and Yakovlev, V. Resonant excitation of high order modes in the 3.9 GHz cavity of the Linac Coherent Light Source. United States: N. p., 2018. Web. doi:10.1103/PhysRevAccelBeams.21.022001.
Lunin, A., Khabiboulline, T., Solyak, N., Sukhanov, A., & Yakovlev, V. Resonant excitation of high order modes in the 3.9 GHz cavity of the Linac Coherent Light Source. United States. doi:10.1103/PhysRevAccelBeams.21.022001.
Lunin, A., Khabiboulline, T., Solyak, N., Sukhanov, A., and Yakovlev, V. Tue . "Resonant excitation of high order modes in the 3.9 GHz cavity of the Linac Coherent Light Source". United States. doi:10.1103/PhysRevAccelBeams.21.022001.
@article{osti_1419707,
title = {Resonant excitation of high order modes in the 3.9 GHz cavity of the Linac Coherent Light Source},
author = {Lunin, A. and Khabiboulline, T. and Solyak, N. and Sukhanov, A. and Yakovlev, V.},
abstractNote = {Construction of the Linac Coherent Light Source II (LCLS-II) is underway for the world’s first hard x-ray free-electron laser. A central part of the LCLS-II project is a 4 GeV superconducting radio frequency electron linac that will operate in the continuous wave (cw) mode. The linac is segmented into four sections named as L0, L1, L2, and L3. Two 3.9 GHz cryomodules, each housing of eight third-harmonic cavities similar to the cavities developed for the European X-ray Free Electron Laser (XFEL), will be used in section L1 of the linac for linearizing the longitudinal beam profile. Here in this paper, we present a study of trapped high order modes (HOMs) excited by a cw electron beam in the third-harmonic cavities of the LCLS-II linac. A detailed comparison of the original XFEL design and the LCLS-II design with a modified end group is performed in order to estimate the effect of a reduced beam pipe aperture on the efficiency of HOM damping. Furthermore, we apply a statistical analysis of the eigenmode spectrum for the estimation of the probability of resonant HOM losses and influence of HOMs on beam dynamics.},
doi = {10.1103/PhysRevAccelBeams.21.022001},
journal = {Physical Review Accelerators and Beams},
number = 2,
volume = 21,
place = {United States},
year = {Tue Feb 06 00:00:00 EST 2018},
month = {Tue Feb 06 00:00:00 EST 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevAccelBeams.21.022001

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