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Design and performance of a single-stage adiabatic demagnetization refrigerator precooled by a  3He sorption cooler.

Author(s) : ZHAO S., WEI L., WANG G., LI R., FAN X., QUAN J., MA Y., ZHAO M., LIANG J.

Type of article: IJR article

Summary

A single-stage adiabatic demagnetization refrigerator (ADR) precooled by a 3 He sorption cooler has been designed, constructed, and experimentally validated as a lightweight and compact sub-Kelvin cooling solution for space applications. The hybrid cooling system utilizes a 3 He sorption cooler to precool a chromium potassium alum (CPA) salt pill to 545 mK before demagnetization. The ADR comprises a CPA crystal grown directly on a gold-plated copper thermal bus, a tin superconducting heat switch (SCHS), a NbTi superconducting magnet, and a dual-layer magnetic shield. Experimental results demonstrate that, under a magnetic field of 3 T and a constant ramp-down rate of 2.67 mT/s, the ADR achieved a base temperature of 31.7 mK. In the absence of an external heat load, the hold time at 50 mK is approximately 6 h 48 min. The total system heat leak is about 2.82 W, mainly dominated by conduction through the Kevlar suspension. The influence of the applied magnetic field intensity on the base temperature was experimentally tested. Analysis further indicates that reducing parasitic heat loads and minimizing the thermal resistance between the CPA crystal and the copper thermal bus are crucial for achieving even lower base temperature.

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Details

  • Original title: Design and performance of a single-stage adiabatic demagnetization refrigerator precooled by a  3He sorption cooler.
  • Record ID : 30034980
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 188
  • Publication date: 2026/08
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2026.106983

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