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Title: Operation of a high-gradient superconducting radio-frequency cavity with a non-evaporable getter pump

Abstract

The use of non-evaporable getter (NEG) pumps in particle accelerators has increased significantly over the past few years because of their large pumping speed, particularly for hydrogen, compared to the size of the pump. A concern about using such pumps in superconducting radio-frequency (SRF) accelerators is the possibility of shedding particulates which could then migrate into the SRF cavities and produce field emission, therefore degrading the cavity performance. One option to mitigate such issue is to use sintered getter materials which intrinsically offer superior mechanical and particle retention properties. In this article we present the results from cryogenic RF tests of a high-gradient SRF cavity after being evacuated several times with an NEG pump equipped with sintered getter disks and placed in close proximity to the cavity. Here, the results showed that the cavity performance was not affected by the pump up to the quench gradient of 34 MV/m. As a result of this study, two such NEG pumps have been installed next to a cryomodule in the CEBAF accelerator to maintain ultra-high vacuum in the SRF cryomodule and two adjacent warm girder sections.

Authors:
 [1];  [1];  [2];  [2];  [2];  [1]
+ Show Author Affiliations
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. SAES Getters, Lainate (Italy)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1338178
Alternate Identifier(s):
OSTI ID: 1416763
Report Number(s):
JLAB-ACC-16-2390; DOE/OR/23177-4020
Journal ID: ISSN 0168-9002; PII: S0168900216310920; TRN: US1701318
Grant/Contract Number:  
AC05-06OR23177
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 842; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; superconducting cavities; vacuum pumps; field emission

Citation Formats

Ciovati, G., Geng, R., Lushtak, Y., Manini, P., Maccallini, E., and Stutzman, M. Operation of a high-gradient superconducting radio-frequency cavity with a non-evaporable getter pump. United States: N. p., 2016. Web. doi:10.1016/j.nima.2016.10.048.
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Ciovati, G., Geng, R., Lushtak, Y., Manini, P., Maccallini, E., & Stutzman, M. Operation of a high-gradient superconducting radio-frequency cavity with a non-evaporable getter pump. United States. https://doi.org/10.1016/j.nima.2016.10.048
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Ciovati, G., Geng, R., Lushtak, Y., Manini, P., Maccallini, E., and Stutzman, M. Fri . "Operation of a high-gradient superconducting radio-frequency cavity with a non-evaporable getter pump". United States. https://doi.org/10.1016/j.nima.2016.10.048. https://www.osti.gov/servlets/purl/1338178.
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@article{osti_1338178,
title = {Operation of a high-gradient superconducting radio-frequency cavity with a non-evaporable getter pump},
author = {Ciovati, G. and Geng, R. and Lushtak, Y. and Manini, P. and Maccallini, E. and Stutzman, M.},
abstractNote = {The use of non-evaporable getter (NEG) pumps in particle accelerators has increased significantly over the past few years because of their large pumping speed, particularly for hydrogen, compared to the size of the pump. A concern about using such pumps in superconducting radio-frequency (SRF) accelerators is the possibility of shedding particulates which could then migrate into the SRF cavities and produce field emission, therefore degrading the cavity performance. One option to mitigate such issue is to use sintered getter materials which intrinsically offer superior mechanical and particle retention properties. In this article we present the results from cryogenic RF tests of a high-gradient SRF cavity after being evacuated several times with an NEG pump equipped with sintered getter disks and placed in close proximity to the cavity. Here, the results showed that the cavity performance was not affected by the pump up to the quench gradient of 34 MV/m. As a result of this study, two such NEG pumps have been installed next to a cryomodule in the CEBAF accelerator to maintain ultra-high vacuum in the SRF cryomodule and two adjacent warm girder sections.},
doi = {10.1016/j.nima.2016.10.048},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 842,
place = {United States},
year = {Fri Oct 28 00:00:00 EDT 2016},
month = {Fri Oct 28 00:00:00 EDT 2016}
}
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Journal Article:
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https://doi.org/10.1016/j.nima.2016.10.048
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