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Cryocoolers 11 pp 273-280 | Cite as

Thermally Actuated 3He Pulse Tube Cooler

  • Y. Matsubara
  • H. Kobayashi
  • S. L. Zhou
Chapter

Abstract

An isotope of Helium gas, 3He, is an attractive working gas for cryocoolers that strive to efficiently provide cooling temperatures below 4 K. The drawback of this gas is that it is extremely expensive. To minimize the total amount of gaseous 3He, a hybrid cycle has been proposed. A single-stage pulse tube cooler using 4 He as the working gas and either a Stirling-type or GM-type compressor system can provide a cooling temperature around 40 K, starting from room temperature. A secondary cycle using 3He can then be thermally attached to this cold head to produce a secondary cooling temperature below 4 K. The operating frequency of the secondary cycle should be lower than 2 Hz to prevent degradation of the performance of the lower-stage regenerator.

In this study, a thermally actuated pressure wave generator driven between the temperatures of 40 K and 300 K was selected; it has no difficulty in generating a pressure wave below a frequency of 2 Hz. Workflow analysis calculations indicate that the total amount of 3He working gas required for this secondary cycle may be minimized by the use of a warm expander type of phase control.

Keywords

Warm Regenerator Pulse Tube Enthalpy Flow Primary Cycle Pulse Tube Refrigerator 
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

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Y. Matsubara
    • 1
  • H. Kobayashi
    • 1
  • S. L. Zhou
    • 1
  1. 1.Atomic Energy Research InstituteNihon UniversityFunabasbi, ChibaJapan

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