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Cryogenic Performance of a Superfluid Helium Relief Valve for the LHC Superconducting Magnets

  • H. Danielsson
  • G. Ferlin
  • B. Jenninger
  • C. Luguet
  • S.-E. Milner
  • J.-M. Rieubland
Part of the A Cryogenic Engineering Conference Publication book series (ACRE, volume 41)

Abstract

The high-field superconducting magnets of the Large Hadron Collider (LHC) project at CERN will operate below 1.9 K in static baths of pressurized helium II. In case of resistive transition (“quench”), the resulting pressure rise in the cryostats must be limited to below their 2 MPa design pressure. This is achieved by discharging helium at high flow-rates into a cold recovery header, normally maintained at 20 K. For this purpose, we have designed, built and tested a cryogenic quench relief valve with a nominal diameter of 50 mm and an opening time of below 0.1 s. The valve, which can be opened on an external trigger, also acts as a relief device actuated by the upstream pressure when it exceeds 0.4 MPa. In normal operation, the closed poppet must be helium-tight, for hydraulic and thermal separation of the magnet baths from the recovery header. Following mechanical qualification tests under vacuum, we have mounted the relief valve in a dedicated cryogenic measuring bench, in order to perform precision thermal measurements with pressurized helium II.

Keywords

Large Hadron Collider Heat Load Relief Valve Superfluid Helium Heat Leak 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1996

Authors and Affiliations

  • H. Danielsson
    • 1
  • G. Ferlin
    • 2
  • B. Jenninger
    • 2
  • C. Luguet
    • 2
  • S.-E. Milner
    • 2
  • J.-M. Rieubland
    • 2
  1. 1.The University of LundLundSweden
  2. 2.CERNGeneva 23Switzerland

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