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Mechanical cooler-to-dewar interfacing in a long-lifetime, hybrid stored cryogen system.

Author(s) : HOPKINS R. A., NIECZKOSKI S. J., PAYNE D. A., SIEBERT J. F., BREON S. R.

Type of article: Article

Summary

The cryogenic subsystem for the Advanced X-Ray Astrophysics Facility, X-Ray Spectrometer represents a new breed of long-lifetime, hybrid stored cryogen systems. The design achieves a predicted lifetime of 5 years with only 480 l of superfluid helium by using mechanical coolers to limit the parasitic heating into the dewar. The system uses two momentum-compensated pairs of split, Stirling-cycle coolers to cool the dewar outer vapour-cooled shield. Use of the 80 K coolers can reduce the helium loss rate by about a factor of 3. The paper primarily addresses the means for making efficient use of the coolers. Analysis was performed to determine optimal switch operating characteristics. Requirements associated with use of the coolers, analyses performed and the interface design concept are discussed.

Details

  • Original title: Mechanical cooler-to-dewar interfacing in a long-lifetime, hybrid stored cryogen system.
  • Record ID : 1993-1819
  • Languages: English
  • Source: Cryogenics - vol. 32 - n. 2
  • Publication date: 1992

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