Journal
CRYOGENICS
Volume 51, Issue 10, Pages 609-612Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cryogenics.2011.07.007
Keywords
Pulse tube cryocooler; Three-stage; Critical point; Helium-4; Cold inertance tube
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Funding
- National Funds for Distinguished Young Scientists of China [50825601]
- Major State Basic Research Development Program of China [2011CB706501]
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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. (C) 2011 Elsevier Ltd. All rights reserved.
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