High Performance Heat Conductor with Small Spring Constant for Cryogenic Applications

Tomohiro Yamada; Takayuki Tomaru; Toshikazu Suzuki; Takafumi Ushiba; Nobuhiro Kimura; Suguru Takada; Yuki Inoue; Takaaki Kajita

doi:10.1016/j.cryogenics.2021.103280

arXiv · 2003.13457

High Performance Heat Conductor with Small Spring Constant for Cryogenic Applications

Tomohiro Yamada·Takayuki Tomaru·Toshikazu Suzuki·Takafumi Ushiba·Nobuhiro Kimura·Suguru Takada·Yuki Inoue·Takaaki Kajita

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Abstract

We developed a soft and high thermal conductive heat link for cryogenic applications. The measured maximum thermal conductivity was approximately 18500 W/m/K at 10 K. This spring constant was 1/43 of that of a single thick wire with the same cross-sectional area at room temperature. We realized these performances by utilizing high purity aluminum (99.9999 %, 6N) and by stranding many thin wires that are 0.15 mm in diameter. The electrical Residual Resistivity Ratio (RRR) was also measured and used to estimate the thermal conductivity by Wiedemann-Franz law. We observed the size effect on the electrical conductivity, and evaluated the effect of mechanical deformation to the RRR. These evaluations allow us to design a pragmatic heat link for cryogenic application.

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Tomohiro Yamada, Takayuki Tomaru, Toshikazu Suzuki, Takafumi Ushiba, Nobuhiro Kimura, Suguru Takada, Yuki Inoue, Takaaki Kajita. 2020-03-25. High Performance Heat Conductor with Small Spring Constant for Cryogenic Applications. https://doi.org/10.1016/j.cryogenics.2021.103280

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