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Cryocoolers 11 pp 381-386 | Cite as

A Gifford-McMahon Cycle Cryocooler below 2K

  • T. Satoh
  • A. Onishi
  • I. Umehara
  • Y. Adachi
  • K. Sato
  • E. J. Minehara
Chapter

Abstract

According to theory, a Gifford-McMahon (GM) cycle cryocooler with 4He cannot cool below 2 K because of the 4He superfluid transition near this temperature. However replacing 4He by 3He removes this temperature limitation. The cooling performance of a GM cryocooler with a HoCu 2 magnetic regenerator material is investigated using 3He. The minimum temperature of 2.3 K with 4He goes down to 1.65 K when the 4He working fluid is replaced by 3He. The maximum cooling capacity at 2 K is 53.9 mW with a compressor power of about 2.5 kW, and the cooling capacity at 4.2 K is enhanced by more than 20%.

The effect of a new regenerator material (NdInCu 2) on the cooling performance was also investigated. The minimum temperature decreased to 1.64 K and the cooling capacity at 2 K improved to 57.1 mW with the use of this material in the bottom 40% of the regenerator.

Keywords

Heat Load Orientation Dependence Cooling Capacity Cooling Performance Japan Atomic Energy Research Institute 
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

  • T. Satoh
    • 1
  • A. Onishi
    • 2
  • I. Umehara
    • 3
  • Y. Adachi
    • 3
  • K. Sato
    • 3
  • E. J. Minehara
    • 4
  1. 1.R&D CenterSumitomo Heavy Industries, Ltd.Hiratsuka, KanagawaJapan
  2. 2.Precision Products DivisionSumitomo Heavy Industries, Ltd.Tanashi, TokyoJapan
  3. 3.Yokohama National UniversityYokohama, KanagawaJapan
  4. 4.FEL Lab.Japan Atomic Energy Research InstituteNaka, IbarakiJapan

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