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Development of Active Gas-Gap Heat Switch for Double-Stage Adiabatic Demagnetization Refrigerators

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Abstract

We designed and fabricated an active gas-gap heat switch (AGGHS), which ON/OFF the heat conduction between the 1st stage (0.05–2 K) and the 2nd stage (1–4 K) of a double-stage adiabatic demagnetization refrigerator (DADR). Our design geometrically separates two components which dominates the ON or OFF performance, and achieved heat conductivity of 6 mW/K (ON) or 4 μW/K (OFF) at 2 K. The ON/OFF is controlled by a heater attached to the charcoal box to adsorb/deadsorb 4He gas inside. We introduced the AGGHS to the DADR and successfully cooled the detector stage down to 60 mK, working properly more than a year.

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References

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Authors and Affiliations

  1. Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo, 192-0397, Japan

    Y. Ishisaki, K. Henmi, H. Akamatsu, T. Enoki & T. Ohashi

  2. Kanazawa University, Kakuma-Machi, Kanazawa, Ishikawa, 920-1192, Japan

    A. Hoshino

  3. ARD/JAXA, 2-1-1 Sengen, Tsukuba-shi, Ibaraki, 305-8505, Japan

    K. Shinozaki

  4. NAOJ, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan

    H. Matsuo, N. Okada & T. Oshima

Authors
  1. Y. Ishisaki
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  2. K. Henmi
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  3. H. Akamatsu
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  4. T. Enoki
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  5. T. Ohashi
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  6. A. Hoshino
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  7. K. Shinozaki
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  8. H. Matsuo
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  9. N. Okada
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  10. T. Oshima
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Corresponding author

Correspondence to Y. Ishisaki.

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Ishisaki, Y., Henmi, K., Akamatsu, H. et al. Development of Active Gas-Gap Heat Switch for Double-Stage Adiabatic Demagnetization Refrigerators. J Low Temp Phys 167, 777–782 (2012). https://doi.org/10.1007/s10909-012-0594-7

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  • DOI: https://doi.org/10.1007/s10909-012-0594-7

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