Proposal of electrical edge joint for a demountable high-temperature superconducting magnet

S. Ito, H. Hashizume, L. Bromberg, M. Takayasu, J. Minervini
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Abstract

Electrical edge joint of a stacked high-temperature superconducting (HTS) conductor is explored for electrical joints for a demountable HTS toroidal field coil. Demountable coils would be very useful in small tokamak plasma-facing component-test machines, such as Vulcan. The demountable concept consists of forcing together the edges of stacked HTS conductor embedded in a conductive or a structural material. Numerical evaluation showed that inserting an indium film between joint surfaces or plating copper layer on joint surfaces could prevent joint resistance from increasing due to misalignment of the contact surface and would provide a compliant layer between joints. Joint resistance of the edge joint can become smaller than that of electrical lap joint when the number of the stacked HTS tape is large. We carried out a testing program of the edge joint of a stacked YBCO conductor within a copper jacket. The HTS cable has a critical current of 1600 A at 77 K in self field. The experimental results showed that joint resistance in the edge joint was higher than expectation, as was irreproducible. One potential reason for the degradation of HTS material is the damage to the tape edge in preparation of the joint region due to milling. Another potential reason was low accuracy of fabrication of joint surface, the joint surface were not parallel to another one. The joint resistance will be reduced by sophistication of fabrication process for the joint surface.
一种可拆卸高温超导磁体电边接头的设计
研究了可拆卸式高温超导环形场线圈的电接头,探讨了堆叠高温超导导体的电边接头。可拆卸线圈在小型托卡马克等离子体组件测试机器(如Vulcan)中非常有用。可拆卸的概念包括将嵌入导电或结构材料中的堆叠高温超导导体的边缘压在一起。数值计算表明,在接头表面插入铟膜或在接头表面镀铜层可以防止因接触面不对中而增加的接头阻力,并在接头之间提供一层柔顺层。当堆叠HTS胶带数量较大时,边缘接头的接头电阻比电搭接接头的接头电阻小。对铜套内叠置YBCO导体的边缘接头进行了测试。高温超导电缆在自场77 K时的临界电流为1600 a。实验结果表明,边缘接头接头阻力大于预期值,且具有不可重现性。高温超导材料退化的一个潜在原因是由于铣削在制备接头区域时对胶带边缘的破坏。另一个可能的原因是关节面加工精度低,关节面与关节面不平行。通过对接头表面加工工艺的改进,可以降低接头的阻力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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