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Frequency response characteristics of a thermally coupled three-stage Stirling-type pulse tube cryocooler capable of achieving 110 mW@7 K.

Author(s) : WEN F., LIU S., WU W., SONG J., LI N., JIANG Z., WU Y.

Type of article: IJR article

Summary

Long-life cryocoolers operating below 7 K are crucial for infrared astronomy projects, such as the hybrid cryocooler employed as the MIRI cryogenic system in the James Webb Space Telescope, which provides a cooling temperature of 6.2 K. A totally thermally-coupled three-stage Stirling-type pulse tube cryocooler was developed in SITP to obtain a relatively high cooling capacity at 6∼7 K. With the cold inertance tube as the phase shifter of the third stage pulse tube cryocooler, a no-load temperature of 3.96 K was reached with He-4. The operating frequency was 26.5 Hz, and the average pressure was 1.68 MPa at room temperature. Simulation results show that the frequency of the third stage SPTC has significant effects on the impedance characteristics of the cold inertance tube and the efficiency of the low-temperature regenerator. The effect of frequency on the cooling capacity has been verified experimentally, and the optimal frequency changes with cooling temperatures and precooling temperatures. When the precooling temperatures of the first stage and the second stage were 90 K and 24 K, the cooling capacity of 58.5 mW@6 K and 113.4 mW@7 K under 100 W input electric power of the third stage SPTC were obtained with the optimized operating frequencies of 24.5 and 23 Hz, respectively. The total input electric power was 510 W when achiveing 113.4 mW@7 K.

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Details

  • Original title: Frequency response characteristics of a thermally coupled three-stage Stirling-type pulse tube cryocooler capable of achieving 110 mW@7 K.
  • Record ID : 30030810
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 145
  • Publication date: 2023/01
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2022.10.014

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