Leak-Tightness Assessment of Demountable Joints for the Super Fluid Helium System of the CERN Large Hadron Collider (LHC)

  • Jean-Claude Brunet
  • Alain Poncet
  • Philippe Trilhe
Chapter
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 39)

Abstract

The future high energy accelerator LHC presently considered at CERN, will make heavy use of demountable cryogenic joints operating at superfluid helium temperatures (1.8 K). These joints will be required for connecting the cryomagnets to their feeding lines, helium safety valves to cold masses, both on their measuring benches and eventually in their final installation set-up. The very large size of the future machine and, consequently, the large number of cryogenic joints imply that their reliability in leak tightness be very high, in particular after extreme loading conditions such as the high helium pressures resulting from superconducting magnet quenches.

For these reasons, a test set-up has been especially built at CERN to reproduce these conditions, and to assess the leak tightness reliability of commercially available joints. A description of the facility is presented, together with the first test results.

Keywords

Magnesium Torque Helium Polyethylene Flange 

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References

  1. 1.
    Interconnexion entre les composants magnétiques prototypes du LHC (J.C. Brunet, M. Genet, C. Reymermier, Ph. Trilhe) - ref. CERN/MT/92-06 (ESH) - Note LHC 216Google Scholar
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    H. Ishimaru and H. Yoshiki, “Sealing performance of gaskets and flanges against superfluid helium” p. 456 Cryogenics, Vol. 31, June 1991.CrossRefGoogle Scholar
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    J. Montuclard, M. Lefrançois, Ch. Romand “What joining Method for the New Generation of Accelerators (SSC and LHC)” Technical Note - Le Carbone Lorraine Cefilac Etanchéité, 90 rue de la Roche du Geai - 42029 ST-ETIENNE/CEDEX - FRANCEGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • Jean-Claude Brunet
    • 1
  • Alain Poncet
    • 1
  • Philippe Trilhe
    • 1
  1. 1.MT DivisionCERNGeneva 23Switzerland

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