Thermal Conductance and High-Frequency Properties of Cryogenic Normal or Superconducting Semi-rigid Coaxial Cables in the Temperature Range of 1?8?K
Thermal Conductance and High-Frequency Properties of Cryogenic Normal or Superconducting Semi-rigid Coaxial Cables in the Temperature Range of 1?8?K
复制标题
1?8?K温度范围内低温普通或超导半刚性同轴电缆的热导率和高频特性
DOI：
10.1007/s10909-018-1931-2
复制
发表时间：
2018
影响因子：
2
通讯作者：
Ohkubo M.
中科院分区：
文献类型：
--
作者：
Kushino A.;Kasai S.;Ukibe M.;Ohkubo M.
在这项研究中，薄的半刚性电缆组成的不同的导体和外径范围从0.86至1.19毫米的特性进行了研究，在低温下。在约1和8 K之间测量热导率，并在3 K下获得电缆中衰减的频率依赖性。电缆中使用的电导体是合金：铍铜、黄铜、不锈钢（SUS304）、磷青铜、白铜（CuNi）和铌钛（NbTi）。还检查了具有形成外部电导体的编织线的商业微型同轴电缆的热导率以供参考。将测得的热导率与已发表的数据以及从材料库和数据库中生成的数据进行比较。在使用普通金属的测量电缆中，由SUS304导体和聚四氟乙烯绝缘体组成的半刚性电缆的热导率最低。采用SUS 304或CuNi的半刚性电缆，通过在中心导体上镀一层厚度约为的银层，其传输性能得到改善，其热导率随镀层的增加而增加约一个数量级。超导NbTi半刚性电缆表现出最低的热导率的所有电缆在本研究中考虑沿着具有非常小的衰减高达5 GHz以上。
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 approximatelythickness, 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.