A three-stage Stirling pulse tube cryocooler operating below the critical point of helium-4

作者：Qiu, L. M.; Cao, Q.; Zhi, X. Q.; Gan, Z. H.^*; Yu, Y. B.; Liu, Y.

来源：Cryogenics, 2011, 51(10): 609-612.

DOI：10.1016/j.cryogenics.2011.07.007

• Pulse tube cryocooler
• Three-stage
• Critical point
• Helium-4
• Cold inertance tube

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.

• 出版日期2011-10
• 单位浙江大学