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Optimization research of salt pill in an adiabatic demagnetization refrigerator.

Number: 0018

Author(s) : ZHENG W., SHEN J., ZHAO Y., CHEN Z., LI Z.

Summary

As an important refrigeration technology in the temperature range of sub-Kelvin, the adiabatic demagnetization refrigeration is widely used to cool bolometric infrared detectors and cryogenic X-ray detectors for low background astronomy because of its high efficiency, gravity independence, and high reliability. The adiabatic demagnetization refrigerator (ADR) mainly consists of the salt pill, superconducting magnet and thermal switch. In the salt pill, the magnetocaloric materials used are mainly hydrated salts, such as CrK(SO4)2•12H2O, CrCs(SO4)2•12H2O and Fe(SO4)2NH4•12H2O. In the salt pill, due to the low thermal conductivity of the hydrated salt in the sub-Kelvin temperature range, an efficient heat-conducting structure, called thermal bus, is necessary to transport the heat generated by the magnetocaloric materials. However, an increase in the volume of thermal buses will lead to a decrease in the theoretical entropy capacity of the magnetocaloric materials, so the volume ratio of magnetocaloric materials and thermal buses in the salt pill needs to be optimized. In this paper, a numerical model of salt pill was established to optimize the cooling performance of the ADR. The performance parameters including the volume ratio of magnetocaloric materials and the diameter of thermal buses were optimized. The results show that there were optimal volume ratios and copper wire diameters in the salt pill.

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Pages: 9

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Details

  • Original title: Optimization research of salt pill in an adiabatic demagnetization refrigerator.
  • Record ID : 30032626
  • Languages: English
  • Subject: Technology
  • Source: 10th IIR Conference on Caloric Cooling and Applications of Caloric Materials
  • Publication date: 2024/08/24
  • DOI: http://dx.doi.org/10.18462/iir.thermag.2024.0018

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