An Hybrid Cycle Helium Liquefier

  • J. M. Poncet
  • A. Ravex
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 43)


A simple and robust helium liqufier has been developed at CEA / SBT. It is a Collins type liquefier operated at atmospheric pressure in a standard commercial helium dewar. To increase reliability, the liquefaction circuit and the refrigerator are separated. Precooling and condensation temperature are provided by an hybrid closed cycle mechanical cryocooler: a commercial Gifford Mc Mahon cryocooler (Cryomech GB 37) is used as a precooler for helium gas to be liquefied and for the Joule Thomson expansion circuit (4.5 W at 4.5 K).

The liquefaction circuit is designed to admit low purity helium. A prototype of this liquefier has been successfully operated for 6 months with a typical liquefaction rate of 1.1 liter per hour.


Heat Exchanger Pneumatic Valve Cryogenic Engineer Liquefaction Rate Cycle Refrigerator 
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  1. 1.
    R.C. Longsworth, 4 K Gifford Mac Manon / Joule Thomson Cycle Refrigerators, in: «Advances in Cryogenics Engineering», Vol. 33, Plenium Press, New York (1987), pp 689–698Google Scholar
  2. 2.
    G. Claudet, R. Lagnier and A. Ravex, Closed cycle liquid helium refrigerators, Cryogenics (1992), Vol. 32, ICEC SupplementGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • J. M. Poncet
    • 1
  • A. Ravex
    • 1
  1. 1.C.E.A. / Grenoble - Département de Recherche Fondamentale sur la MatièreCondensée - Service des Basses TempératuresGrenoble Cedex 9France

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