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A two-stage double-inlet pulse tube cooler for cooling below 4 K is designed and constructed by the aid of numerical analysis. The hot end of the 2nd stage pulse tube is connected to the phase shifting assembly at room temperature without the use of a regenerative tube. A commercial helium compressor with input power of 6 kW and a redesigned commercial rotary valve serve to generate the pressure...
The first two-stage pulse tube refrigerator, providing a lowest temperature of 2.23 K and a cooling power of 370 mW at 4.2 K, employed a parallel arrangement of the two pulse tubes with phase shifters located at room temperature. With the aim of increasing the COP at liquid 4 He temperatures, three modified staging methods were tested in this paper. All refrigerator versions operate with...
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