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

Journal Article · · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
 [1];  [1];  [2];  [2];  [2];  [1]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. SAES Getters, Lainate (Italy)
+ Show Author Affiliations

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.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-06OR23177
OSTI ID:
1338178
Alternate ID(s):
OSTI ID: 1416763
Report Number(s):
JLAB-ACC-16-2390; DOE/OR/23177-4020; PII: S0168900216310920; TRN: US1701318
Journal Information:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 842, Issue C; ISSN 0168-9002
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

References (9)

Vacuum systems for the TPS accelerator journal November 2015
Characterization of the CEBAF 100kV DC GaAs photoelectron gun vacuum system
  • Stutzman, M. L.; Adderley, P.; Brittian, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 574, Issue 2 https://doi.org/10.1016/j.nima.2007.01.170
journal May 2007
Use of non evaporable getter pumps to ensure long term performances of high quantum efficiency photocathodes
  • Sertore, Daniele; Michelato, Paolo; Monaco, Laura
  • Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 32, Issue 3 https://doi.org/10.1116/1.4867488
journal May 2014
Stabilization of a tungsten ⟨310⟩ cold field emitter
  • Kasuya, Keigo; Katagiri, Souichi; Ohshima, Takashi
  • Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena, Vol. 28, Issue 5 https://doi.org/10.1116/1.3488988
journal September 2010
Miniaturized electron gun for high-resolution scanning electron microscope using non-evaporable getter pumps journal April 2006
A new Ti-based non-evaporable getter journal January 1990
Design and installation of a low particulate, ultrahigh vacuum system for a high power free-electron laser
  • Dylla, H. F.; Biallas, G.; Dillon-Townes, L. A.
  • Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 17, Issue 4 https://doi.org/10.1116/1.581735
journal July 1999
Influence of condensed gases on field emission and the performance of superconducting RF cavities journal March 1989
Superconducting TESLA cavities journal September 2000

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The Effect of Ultrasonic Cleaning on the Secondary Electron Yield, Surface Topography, and Surface Chemistry of Laser Treated Aluminum Alloy journal January 2020

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Related Subjects

43 PARTICLE ACCELERATORS
superconducting cavities
vacuum pumps
field emission