A Gifford-McMahon Cycle Cryocooler below 2K
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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.
KeywordsHeat Load Orientation Dependence Cooling Capacity Cooling Performance Japan Atomic Energy Research Institute
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- 1.M. Nagao, T. Inaguchi, H. Yoshimura, S. Nakamura, T. Yamada and M. Iwamoto, “Generation of Superfluid Helium by a Gifford-McMahon Cycle Cryocooler,” Proceedings of the 6th International Cryocooler Conference, Plymouth, MA, DTRC-91/002, David Taylor Research Center (1991) pp. 37–47.Google Scholar
- 2.G. Thummes, C. Wang, S. Bender and C. Heiden, “Pulsrohrenkuhler zur erzeugung von temperaturen im bereich des flussingen heliums”, DKV-Tagungsbericht, 23 (1996) (Jahrgang Band), pp. 147–159.Google Scholar
- 4.T. Satoh, R. Li, H. Asami, Y. Kanazawa and A. Onishi, “Development of High Efficiency 0.5W Class 4K GM Cryocooler,” Cryocoolers 10, Plenum Press, New York (1999), pp. 575–580.Google Scholar
- 7.Sumitomo Heavy Industries, Ltd. SRDK-408D catalog.Google Scholar