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Title: Redesign of the End Group in the 3.9 GHz LCLS-II Cavity

Abstract

Development and production of Linac Coherent Light Source II (LCLS-II) is underway. The central part of LCLS-II is a continuous wave superconducting RF (CW SCRF) electron linac. The 3.9 GHz third harmonic cavity similar to the XFEL design will be used in LCLS-II for linearizing the longitudinal beam profile*. The initial design of the 3.9 GHz cavity developed for XFEL project has a large, 40 mm, beam pipe aperture for better higher-order mode (HOM) damping. It is resulted in dipole HOMs with frequencies nearby the operating mode, which causes difficulties with HOM coupler notch filter tuning. The CW linac operation requires an extra caution in the design of the HOM coupler in order to prevent its possible overheating. In this paper we present the modified 3.9 GHz cavity End Group for meeting the LCLS-II requirements

Authors:
ORCiD logo [1];  [1];  [1];  [1]
  1. Fermilab
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:
1421545
Report Number(s):
FERMILAB-CONF-16-747-TD
1633101
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: 28th International Linear Accelerator Conference, East Lansing, Michigan, 09/25-09/30/2016
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Lunin, Andrei, Gonin, Ivan, Khabiboulline, Timergali, and Solyak, Nikolay. Redesign of the End Group in the 3.9 GHz LCLS-II Cavity. United States: N. p., 2017. Web. doi:10.18429/JACoW-LINAC2016-MOPLR007.
Lunin, Andrei, Gonin, Ivan, Khabiboulline, Timergali, & Solyak, Nikolay. Redesign of the End Group in the 3.9 GHz LCLS-II Cavity. United States. doi:10.18429/JACoW-LINAC2016-MOPLR007.
Lunin, Andrei, Gonin, Ivan, Khabiboulline, Timergali, and Solyak, Nikolay. Mon . "Redesign of the End Group in the 3.9 GHz LCLS-II Cavity". United States. doi:10.18429/JACoW-LINAC2016-MOPLR007. https://www.osti.gov/servlets/purl/1421545.
@article{osti_1421545,
title = {Redesign of the End Group in the 3.9 GHz LCLS-II Cavity},
author = {Lunin, Andrei and Gonin, Ivan and Khabiboulline, Timergali and Solyak, Nikolay},
abstractNote = {Development and production of Linac Coherent Light Source II (LCLS-II) is underway. The central part of LCLS-II is a continuous wave superconducting RF (CW SCRF) electron linac. The 3.9 GHz third harmonic cavity similar to the XFEL design will be used in LCLS-II for linearizing the longitudinal beam profile*. The initial design of the 3.9 GHz cavity developed for XFEL project has a large, 40 mm, beam pipe aperture for better higher-order mode (HOM) damping. It is resulted in dipole HOMs with frequencies nearby the operating mode, which causes difficulties with HOM coupler notch filter tuning. The CW linac operation requires an extra caution in the design of the HOM coupler in order to prevent its possible overheating. In this paper we present the modified 3.9 GHz cavity End Group for meeting the LCLS-II requirements},
doi = {10.18429/JACoW-LINAC2016-MOPLR007},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {5}
}

Conference:
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