RE-CONDENSATION AND LIQUEFACTION OF HELIUM AND HYDROGEN USING COOLERS | Zendy

M. A. Green | Zendy; J. G. Weisend | Zendy

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RE-CONDENSATION AND LIQUEFACTION OF HELIUM AND HYDROGEN USING COOLERS

Author(s) -

M. A. Green,

J. G. Weisend

Publication year - 2010

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.177

H-Index - 75

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.3422421

Subject(s) - liquid helium , condensation , evaporative cooler , liquefaction , materials science , helium , cryogenics , drop (telecommunication) , hydrogen , thermodynamics , liquid hydrogen , refrigeration , mechanics , nuclear engineering , chemistry , atomic physics , physics , mechanical engineering , engineering , organic chemistry

Coolers are used to cool cryogen free devices at temperatures from 5 to 30 K. Cryogen free cooling involves a temperature drop within the device being cooled and between the device and the cooler cold heads. Liquid cooling with a liquid cryogen distributed over the surface of a device combined with re‐condensation can result in a much lower temperature drop between the cooler and the device being cooled. The next logical step beyond simple re‐condensation is using a cooler to liquefy the liquid cryogen in the device. A number of tests of helium liquefaction and re‐condensation of helium have been run using a pulse tube cooler in the drop‐in mode. This report discusses the parameter space over which re‐condensation and liquefaction for helium and hydrogen can occur.

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