Magnetic Shielding for a Spaceborne Adiabatic Demagnetization Refrigerator (ADR)
The Goddard Space Flight Center has studied magnetic shielding for an adiabatic demagnetization refrigerator. Four types of shielding were studied: active coils, passive ferromagnetic shells, passive superconducting coils, and passive superconducting shells. The passive superconducting shells failed by allowing flux penetration. The other three methods were successful, singly or together.
Experimental studies of passive ferromagnetic shielding are compared with calculations made using the Poisson Group of programs, distributed by the Los Alamos Accelerator Code Group of the Los Alamos National Laboratory. Agreement between calculation and experiment is good. The ferromagnetic material is a silicon iron alloy.
KeywordsPermeability Furnace Welding Helium Epoxy
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- 3.Sandy Holdorf, Private Communication, 3M Company, (1987).Google Scholar
- 6.Michael L. Dingus, “Adiabatic Demagnetization Refrigerator for Use in Zero Gravity,” Final Report on Contract NAS5-29418, Alabama Cryogenic Engineering, Huntsville, Alabama (1988).Google Scholar
- 8.F. W. Ackermann and D. Dietrich, personal communication: Carpenter Technology Corporation internal memorandum used in preparing Ackermann et al.Google Scholar
- 9.R. F. Arentz and M. H. Johnson, Magnetic shielding in a cryogenic environment, Evaluation Engineering, 25:80 (1986).Google Scholar
- 11.Y. Suzuki, E. Horikoshi, and K. Niwa, Magnetic properties and ferromagnetic shielding of Ni-Mo-Fe alloys at cryogenic temperatures, Fujitsu Scientific and Technical Journal 20:167 (1984).Google Scholar
- 14.Scott Smith, Private Communication, American Magnetics, Inc. (1991).Google Scholar