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Two-stage magnetic refrigerator for astronomical applications with reservoir temperatures above 4 K.

Author(s) : HAGMANN C., RICHARDS P. L.

Type of article: Article

Summary

The authors propose a novel adiabatic demagnetization refrigerator (ADR) to produce temperatures as low as 100 milliK starting from a high-temperature reservoir between 4 and 8 K. This refrigerator can be used to cool bolometric infrared detectors for low background astronomy from mountain tops, balloons or satellites, as well as to cool cryogenic X-ray detectors. The two-stage ADR consists of a single magnet with a paramagnetic chromic caesium alum salt pill to produce the low temperature and paramagnetic gadolinium gallium garnet as the first stage to intercept heat from the high-temperature reservoir. In a single cycle, the ADR maintains a temperature of 100 milliK for 10-100 hours. The factors on which this time depends are discussed.

Details

  • Original title: Two-stage magnetic refrigerator for astronomical applications with reservoir temperatures above 4 K.
  • Record ID : 1995-0002
  • Languages: English
  • Source: Cryogenics - vol. 34 - n. 3
  • Publication date: 1994/03

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