An adiabatic demagnetisation refrigerator with a mechanical pre-cooler for space applications

Details An adiabatic demagnetisation refrigerator with a mechanical pre-cooler for space applications An adiabatic demagnetisation refrigerator with a mechanical pre-cooler for space applications

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.356..275d&link_type=abstract

In ESA, Proceedings of an ESA Symposium on Photon Detectors for Space Instrumentation p 275-279 (SEE N94-15025 03-19)

Astronomy and Astrophysics

Astronomy

Demagnetization, Magnetic Fields, Refrigerators, Spacecraft Instruments, Systems Engineering, Technology Assessment, X Ray Astronomy

Scientific paper

An Adiabatic Demagnetization Refrigerator (ADR) suitable for use in space would have applications in the fields of mm/submm and x-ray astronomy. Since ADR's operate in the absence of gravity without the need for highly complex modifications from established laboratory designs, they could offer a considerable advantage over He-3 refrigerators. The concept of an ADR backed by a mechanical pre-cooler is evaluated. Either a second ADR or a recycling Helium bath is used between the ADR and the mechanical cooler. This has the potential for both high reliability and very long operations. A system design which is related to the present development status of mechanical coolers is presented. The performance of such a system is evaluated. The operational parameters addressed include: achievable temperature and stability; hold and recycle times; and residual magnetic field strength.

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