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  • 1
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    Magnetic shielding for a spaceborne adiabatic demagnetization refrigerator (ADR) (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: 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.
    Keywords: ENGINEERING (GENERAL)
    Type: In: Advances in cryogenic engineering. Vol. 37B - Proceedings of the 1991 Cryogenic Engineering Conference, Univ. of Alabama, Huntsville, June 11-14, 1991 (A93-48578 20-37); p. 907-914.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Adiabatic demagnetization refrigerator for space use (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An Adiabatic Demagnetization Refrigerator (ADR) for space use is under development at NASA's Goddard Space Flight Center (GSFC). The breadboard ADR operated at 100 mK for 400 minutes. Some significant changes to that ADR, designed to eliminate shortcomings revealed during tests, are reported. To increase thermal contact, the ferric ammonium sulfate crystals were grown directly on gold-plated copper wires which serve as the thermal bus. The thermal link to the X-ray sensors was also markedly improved. To speed up the testing required to determine the best design parameters for the gas gap heat switch, the new heat switch has a modular design and is easy to disassemble.
    Keywords: ENGINEERING (GENERAL)
    Type: 1989 Cryogenic Engineering Conference; Jul 24, 1989 - Jul 28, 1989; Los Angeles, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A spaceworthy ADR - Recent developments (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Recent developments concerning the performance and reliability of a spaceworthy adiabatic demagnetization refrigerator (ADR) for the AXAF X-ray spectrometer are considered. They include a procedure for growing the salt pill around a harness made up of 6080 gold-plated copper wires, a totally modular gas gap heat switch, and a suspension system utilizing Kevlar fibers.
    Keywords: ENGINEERING (GENERAL)
    Type: Cryogenic Optical Systems and Instruments IV; Jul 10, 1990 - Jul 12, 1990; San Diego, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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