A three-stage Stirling pulse tube cryocooler operating below the critical point of helium-4 |
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Authors: | LM Qiu Q Cao XQ Zhi ZH Gan YB Yu Y Liu |
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Affiliation: | Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, PR China |
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Abstract: | Precooled phase shifters can significantly enhance the phase shift effect and further improve the performance of pulse tube cryocoolers. A separate three-stage Stirling pulse tube cryocooler (SPTC) with a cold inertance tube was designed and fabricated. Helium-4 instead of the rare helium-3 was used as the working fluid. The cryocooler reached a bottom temperature of 4.97 K with a net cooling power of 25 mW at 6.0 K. The operating frequency was 29.9 Hz and the charging pressure was 0.91 MPa. It is the first time a refrigeration temperature below the critical point of helium-4 was obtained in a three-stage Stirling pulse tube cryocooler. |
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Keywords: | Pulse tube cryocooler Three-stage Critical point Helium-4 Cold inertance tube |
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