Journal of Low Temperature Physics

, Volume 193, Issue 3–4, pp 611–617 | Cite as

Thermal Conductance and High-Frequency Properties of Cryogenic Normal or Superconducting Semi-rigid Coaxial Cables in the Temperature Range of 1–8 K

  • A. KushinoEmail author
  • S. Kasai
  • M. Ukibe
  • M. Ohkubo


In this study, the characteristics of thin semi-rigid cables composed of different conductors and with outer diameters ranging from 0.86 to 1.19 mm were investigated at low temperatures. The thermal conductance was measured between approximately 1 and 8 K, and the frequency dependence of the attenuation in the cables was obtained at 3 K. The electrical conductors used in the cables were alloys: beryllium copper, brass, stainless steel (SUS304), phosphor bronze, cupronickel (CuNi), and niobium–titanium (NbTi). The thermal conductance of a commercial miniature coaxial cable with braided wires forming the outer electrical conductor was also examined for reference. The measured thermal conductance was compared to published data and that generated from material libraries and databases. Among the measured cables using normal metals, the semi-rigid cable composed of SUS304 conductors and a polytetrafluoroethylene insulator showed the lowest thermal conductance. The transmission performance of the semi-rigid cables using SUS304 or CuNi was improved by plating the central conductors with a silver coating of approximately \(3~{\upmu }\hbox {m}\) thickness, and their thermal conductance with the plating increased by approximately one order of magnitude. The superconducting NbTi semi-rigid cable exhibited the lowest thermal conductance of all the cables considered in the present study along with very small attenuation up to above 5 GHz.


Thermal conductance Superconductor Normal conductor Coaxial cable Attenuation 



We would like to thank Ms. H. Shimomura and Mr. H. Seino for the preparation of the measured semi-rigid cables. We are also grateful to Mr. S. Iwasaki for his assistance in machining the measurement tools. Most of the experiments in this work were performed at the National Colleges of Technology, Asahikawa College (ANCT). AK is grateful to the staff of the ANCT Technology Innovation Center.


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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Kurume University School of MedicineKurumeJapan
  2. 2.COAX CO., LTD.Aoba-ku, YokohamaJapan
  3. 3.National Institute of Advanced Industrial Science and TechnologyTsukubaJapan

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