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 HoCu2 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 (NdInCu2) 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.
A Gifford-McMahon Cycle Cryocooler below 2K
Cryocoolers 11 ; 381-386
2002-01-01
6 pages
Article/Chapter (Book)
Electronic Resource
English
A Gifford-McMahon Cycle Cryocooler below 2 K
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