Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Helium guard system design for HIAF iLinac cryogenic distribution system

  • Xianjin Wang (College of Petrochemical Engineering, Lanzhou University of Technology) ;
  • Shuping Chen (College of Petrochemical Engineering, Lanzhou University of Technology) ;
  • Wen Jun (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Dajun Fan (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Liming Zhu (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Yanan Lib (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Xiaofei Niu (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Junhui Zhang (Institute of Modern Physics, Chinese Academy of Sciences)
  • Received : 2022.10.09
  • Accepted : 2023.03.02
  • Published : 2023.03.31
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Abstract

2 K superfluid helium cryogenic system is the crucial component of many large accelerators. When the cryogenic system is operating at 2K@3129Pa, many room-temperature parts are connected to superfluid helium via tubes. Air Leakage in these connections may lead to air contamination of the cryogenic system. Air contamination may cause equipment failure in cryogenic systems and, in extreme cases, render the entire accelerator system inoperable. Helium guard is a technique that guards against air contamination of these sub-atmospheric pressure connections in 2 K superfluid helium cryogenic system. This paper introduces a typical 2 K cryogenic distribution design for large accelerators, and make risk analysis of air contamination. Finally, the analysis of specific leakage points and detailed engineering design are presented, which may be used as a reference when designing of a 2 K superfluid helium cryogenic distribution system.

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Acknowledgement

This study was financially supported by Gansu Natural Science Foundation (Grant No.20JR5RA553).

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