Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Review on innovative small refrigeration methods for sub-Kelvin cooling

  • Dohoon, Kwon (Cryogenic Engineering Laboratory, Korea Advanced Institute of Science and Technology) ;
  • Junhyuk, Bae (Cryogenic Engineering Laboratory, Korea Advanced Institute of Science and Technology) ;
  • Sangkwon, Jeong (Cryogenic Engineering Laboratory, Korea Advanced Institute of Science and Technology)
  • Received : 2022.11.28
  • Accepted : 2022.12.28
  • Published : 2022.12.31
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Abstract

Sub-Kelvin cooling has been generally demanded for the fields of low temperature physics, such as physical property measurements, astronomical detection, and quantum computing. The refrigeration system with a small size can be appropriately introduced when the measurement system does not require a high cooling capacity at sub-Kelvin temperature. The dilution refrigerator which is a common method to reach sub-Kelvin, however, must possess a large 3He circulation equipment at room temperature. As alternatives, a sorption refrigerator and a magnetic refrigerator can be adopted for sub-Kelvin cooling. This paper describes those coolers which have been developed by various research groups. Furthermore, a cold-cycle dilution refrigerator of which the size of the 3He circulation system is minimized, is also introduced. Subsequently, a new concept of dilution refrigerator is proposed by our group. The suggested cooler can achieve sub-Kelvin temperature with a small size since it does not require any recuperator and turbo-molecular vacuum pump. Its architecture allows the compact configuration to reach sub-Kelvin temperature by integrating the sorption pump and the magnetic refrigerators. Therefore, it may be suitably utilized in the low temperature experiments requiring low cooling capacity.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT).(NRF-2022R1A2C2091842)

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