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Development of double-stage ADR for future space missions.

Author(s) : SHINOZAKI K., MITSUDA K., YAMASAKI N. Y., et al.

Summary

The authors report a development of a portable dewar with a double-stage ADR (adiabatic demagnetization refrigerator) in it, and its cooling test results. The purpose of this system is to establish a cooling cycle of double-stage adiabatic demagnetization from 4.2 K to 50 mK, which is strongly desired for future space science missions. In their test dewar, two units of ADR are installed in parallel at the bottom of a liquid He tank. The authors used 600 g of GGG (gadolinium gallium garnet) for the higher temperature stage (4 tesla) and about 90 g of CPA (chromic potassium alum) for the lower temperature stage (3 tesla). A passive gas-gap heat switch (PGGHS) is used between these two stages, while a mechanical heat switch between the He tank and the GGG stage. Using this system, 50 mK was achieved, and various kinds of cooling cycles with different operating temperatures and different sequences of magnetization were tested. The authors also evaluated the performance of the PGGHS, and interference of the magnetic field with each other during a stable temperature control. [Reprinted with permission from Elsevier. Copyright, 2010].

Details

  • Original title: Development of double-stage ADR for future space missions.
  • Record ID : 2010-1717
  • Languages: English
  • Source: 2009 Space Cryogenics Workshop, Arcadia, USA, June 23-25.
  • Publication date: 2010/09
  • DOI: http://dx.doi.org/10.1016/j.cryogenics.2010.02.020

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