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

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.
 [1] ;  [1] ;  [2] ;  [2] ;  [2] ;  [1]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. SAES Getters, Lainate (Italy)
Publication Date:
Report Number(s):
JLAB-ACC-16-2390; DOE/OR/23177-4020
Journal ID: ISSN 0168-9002; PII: S0168900216310920; TRN: US1701318
Grant/Contract Number:
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
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
Country of Publication:
United States
43 PARTICLE ACCELERATORS; superconducting cavities; vacuum pumps; field emission
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1416763