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A mixed refrigerant Joule-Thomson cryocooler for trapped-ion quantum chips.

Number: 0014

Author(s) : XU C., QIAN N., LIANG K.

Summary

J-T cryocoolers are very promising for applications requiring temperatures below 70 K. Still, no substances in nature have a boiling point between liquid nitrogen (70K) and liquid neon (27K). This work, aimed around 50 K, proposes and numerically characterizes a two-stage compression J-T cryocooler employing mixed refrigerants (neon: oxygen: nitrogen = 0.6: 0.3: 0.1, molar ratio) and linear compressors. This temperature range is typically required for applications such as trapped ion quantum chips. It was found that the mass flow rate and input power in the model system increased with the increase of the compressor stroke, the efficiency of the second-stage motor tended to stabilize with the increase of the stroke, and the efficiency of the first-stage motor continued to decrease, which caused the model to reach the highest motor efficiency at a certain stroke. When the total pressure ratio is constant, as the stroke increases, the second-stage pressure ratio will become larger and larger, resulting in the second-stage compressor outlet temperature being too high. A feasibility study of this model is needed in the future, and perhaps the number of compressor stages needs to be increased to avoid the corresponding problems.

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Pages: 8 p.

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Details

  • Original title: A mixed refrigerant Joule-Thomson cryocooler for trapped-ion quantum chips.
  • Record ID : 30033917
  • Languages: English
  • Subject: Technology
  • Source: Cryogenics 2025. Proceedings of the 18th IIR International Conference on Cryogenics, Prague, Czech Republic, 7-11 April 2025.
  • Publication date: 2025/04/07
  • DOI: http://dx.doi.org/10.18462/iir.cryo.2025.0014

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