期刊
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
卷 30, 期 4, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2020.2967680
关键词
Current decay method; evaluation system; instrument development; joint resistance; superconducting joint
资金
- New Energy and Industrial Technology Development Organization (NEDO), Japan [16100555-0]
We have developed an evaluation system for superconducting and/or ultra-low resistance joint resistances. The system evaluates the joint resistance (R-j) by a principle of a current decay in a LR closed circuit. To minimize the measurement time, a one-turn closed-loop coil, i.e., both ends of the conductor are joined together, is used for a sample. Typical inductance of the one-turn loop with a diameter of 100 mm is similar to 0.47 mu H. Thus, measurement time, i.e., times to measure the current are similar to 1 minute and similar to 1 hour for R-j of 10(-9) Omega and 10(-12) Omega, respectively. Using this system, performance of the joint with resistance ranging 10(-14)-10(-8) Omega can be quantitatively evaluated as a function of injected current magunitude and temperature. Resistances of the Nb-Ti samples that were joined using Pb-Bi solder were successfully evaluated to be in the range of 10(-14)-10(-13) Omega at 4.2 K with sample current up to similar to 350 A.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据