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Experimental study of a pulse tube cold head driven by a low frequency thermal compressor.

Number: pap. 23

Author(s) : ZHAO Y., DAI W., VANAPALLI S., et al.

Summary

Cryocoolers operating at liquid helium temperature span a number of application domains, such as cooling of superconducting magnets, SQUID devices etc. GM type cryocoolers are widely used at liquid helium temperature but with shortcomings of using an oil-lubricated compressor that require regular maintenance and rotary valves that reduces the efficiency of the cryocooler. We are developing an alternative system that makes use of a Vuilleumier type thermal compressor. The system consists of a Stirling type pulse tube cryocooler that provides a cold heat sink to a thermal compressor. The thermal compressor generates pressure wave to drive a second pulse tube cold head. We experimentally studied the influence of pre-cooling temperature and frequency on the
performance of the pulse tube cold head. The lowest recorded temperature is 24.3 K with a pressure ratio of 1.18 and a frequency of 3 Hz. In this paper, the design of the cooling system and preliminary experimental results are presented.

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Details

  • Original title: Experimental study of a pulse tube cold head driven by a low frequency thermal compressor.
  • Record ID : 30018357
  • Languages: English
  • Source: 1st IIR International Conference of Cryogenics and Refrigeration Technology (ICCRT 2016). Proceedings: Bucharest, Romania, June 22-25, 2016.
  • Publication date: 2016/06/22
  • DOI: http://dx.doi.org/10.18462/IIR.ICCRT.2016.0023

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