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Title Degradation and Recovery of the LHC RF Cryomodule Performance Using the Helium Processing Technique
  • K. Turaj, O. Brunner, A.C. Butterworth, F. Gerigk, P. Maesen, E. Montesinos, F. Peauger, M. Therasse, W. Venturini Delsolaro
    CERN, Meyrin, Switzerland
Abstract The LHC RF cryomodule "Asia" suffered an accidental influx of about 0.5 l of tunnel air during the leak checks of the pumping manifolds. The resulting risk of particle contamination was difficult to assess, and could not be excluded with certainty. If one or more cavities were contaminated, a severe impact on beam operations in the LHC machine was to be expected. In order to minimize the risks, the Asia cryomodule has been replaced with a spare unit. Subsequently, the cryomodule was tested in the SM18 test facility without intermediate venting, and showed high levels of radiation due to field emission above 1.8 MV in one of the cavities. The other cavities were less strongly affected, but clear signs of contamination were observed. The helium processing technique was used to improve the performance of the SRF cavity with respect to field emission. This paper will discuss the results of the above-mentioned test.
Paper download THPFAV006.PDF [2.367 MB / 5 pages]
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Conference SRF2021
Series International Conference on RF Superconductivity (20th)
Location East Lansing, MI, USA
Date 28 June-02 July 2021
Publisher JACoW Publishing, Geneva, Switzerland
Editorial Board Kenji Saito (FRIB, MSU, East Lansing, MI, USA); Ting Xu (FRIB, MSU, East Lansing, MI, USA); Naruhiko Sakamoto (RIKEN, Wako, Japan); Ana Lesage (FRIB, MSU, East Lansing, MI, USA); Volker R.W. Schaa (GSI, Darmstadt, Germany)
Online ISBN 978-3-95450-233-2
Online ISSN 2673-5504
Received 21 June 2021
Revised 14 January 2022
Accepted 27 April 2022
Issue Date 01 May 2022
DOI doi:10.18429/JACoW-SRF2021-THPFAV006
Pages 746-750
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