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Continuous Refrigeration between 4.2 and 1°K

  • J. Nicol
  • H. V. Bohm
Conference paper
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 5)

Abstract

Refrigeration between 4.2 and 1°K is commonly produced by the evaporation of liquid He4 from a thermally isolated bath maintained at the appropriate pressure by means of a vacuum pump. In the majority of experimental assemblies, a bath temperature of 1.25°K can be produced without difficulty at which temperature the saturation vapor pressure is slightly less than 1 mm Hg. When the liquid in the bath reaches a certain minimum volume, the experiment must be discontinued, at least temporarily, while the bath is returned to atmospheric pressure and a further supply of liquid at 4.2°K is added. Thereafter, there is an additional loss of liquid while the bath is again pumped down to the operating pressure.

Keywords

Vacuum Pump Bath Temperature Storage Volume Experimental Assembly Valve Seat 
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

© Springer Science+Business Media New York 1960

Authors and Affiliations

  • J. Nicol
    • 1
  • H. V. Bohm
    • 1
  1. 1.Arthur D. Little, Inc.CambridgeUSA

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