Mechanical and Electrical Characteristics of a Bridge-Type Mechanical Lap Joint of HTS STARS Conductors
Mechanical and Electrical Characteristics of a Bridge-Type Mechanical Lap Joint of HTS STARS Conductors
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DOI：
10.1109/tasc.2016.2517197
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发表时间：
2016-01
影响因子：
1.8
通讯作者：
S. Ito;N. Yusa;N. Yanagi;H. Tamura;A. Sagara;H. Hashizume
中科院分区：
文献类型：
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作者：
S. Ito;N. Yusa;N. Yanagi;H. Tamura;A. Sagara;H. Hashizume
螺旋聚变反应堆 FFHR-d1 已提出分段制造高温超导 (HTS) 线圈；联合缠绕和“可重新安装”（可拆卸）螺旋线圈概念分别是主要和高级选项。本文介绍了刚性结构高温超导叠带（STARS）导体桥式机械搭接接头的最新研究活动，特别是用于螺旋线圈的接头缠绕，并讨论了开发可靠接头的一些技术问题。首先，考虑到 FFHR-d1 螺旋线圈联合绕组的现有设计，从运行成本和机械性能的角度讨论了所需的联合性能。然后，基于小规模和大规模接头测试，对原型 STARS 导体接头的机械和电气特性进行了分析，该接头在 100 kA 电流下实现了 1.8 nΩ 的接头电阻。通过小规模导体接头的试验表明，原型接头的接头性能还有待进一步提高。最后，该研究介绍了可靠接头的制造程序。我们需要开发室温下接头的无损检测。为此，我们首先还进行 X 射线计算机断层扫描检查。检查可以粗略判断装配接头是否合格。
Segmented fabrication of high-temperature superconducting (HTS) coils has been proposed for the helical fusion reactor FFHR-d1; the joint-winding and “remountable” (demountable) helical coils concept are the primary and advanced options, respectively. This paper introduces recent research activities on a bridge-type mechanical lap joint of HTS Stacked Tapes Assembled in Rigid Structure (STARS) conductors, particularly to be used for joint winding of the helical coils, and also discusses some technical issues to develop a reliable joint. First, the required joint performance is discussed from the viewpoints of operation cost and mechanical behavior, taking the present design of joint winding of the helical coils for the FFHR-d1 into consideration. Then, mechanical and electrical characteristics of a prototype STARS conductor joint, which achieved a joint resistance of 1.8 nΩ at a current of 100 kA, are analyzed based on small- and largescale joint tests. It is suggested that the joint performance of the prototype joint can be improved more, according to tests of small-scale conductor joints. Finally, the study introduces a fabrication procedure for a reliable joint. We need to develop nondestructive testing for a joint at room temperature. For this purpose, we also perform an X-ray computed tomography inspection as a first step. The inspection can roughly judge whether a fabricated joint is acceptable.