Helium Recovery in the LHC Cryogenic System Following Magnet Resistive Transitions

  • M. Chorowski
  • B. Hilbert
  • L. Serio
  • L. Tavian
  • U. Wagner
  • R. van Weelderen
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 43)

Abstract

A resistive transition (quench) of the Large Hadron Collider magnets provokes the expulsion of helium from the magnet cryostats to the helium recovery system. A high-volume, vacuum-insulated recovery line connected to several uninsulated medium-pressure gas storage tanks, forms the main constituents of the system. Besides a dedicated hardware configuration, helium recovery also implies specific procedures that should follow a quench, in order to conserve the discharged helium and possibly make use of its refrigeration capability. The amount of energy transferred after a quench from the magnets to the helium leaving the cold mass has been estimated on the basis of experimental data. Based on these data, the helium thermodynamic state in the recovery system is calculated using a lumped Chapaumeter approach. The LHC magnet quenches are classified in a Chapaumetric way from their cryogenic consequences and procedures that should follow the quench are proposed.

Keywords

Blow Down Helium Temperature Tank Wall Vapour Quality Medium Quench 
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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References

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    A. Bézaguet et al., Cryogenic Operation and Testing of the Extended LHC Prototype Magnet String, Proc. ICEC 16/ICMC, Kitakyushu, Japan, May 1996.Google Scholar
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    L. Brue, Modélisation Thermohydraulique des Ecoulements Transitoires d’Hélium Cryogénique induits dans la Ligne de Récupération du Demi-Octant par les Transitions Résistives des Aimants du LHC, LHC Note 262, CERN AT/94–03 (CR).Google Scholar
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    M. Chorowski, Transient behaviour and helium recovery in the LHC cryogenic system following magnet resistive transitions, LHC Project note 77, CERN/LHC (1997).Google Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • M. Chorowski
    • 1
  • B. Hilbert
    • 1
  • L. Serio
    • 1
  • L. Tavian
    • 1
  • U. Wagner
    • 1
  • R. van Weelderen
    • 1
  1. 1.LHC DivisionCERNGeneva 23Switzerland

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