Investigation on IC Degradation of MgB2 Rutherford Cables by Deformation During Cabling Process
Investigation on IC Degradation of MgB2 Rutherford Cables by Deformation During Cabling Process
复制标题
布线过程中变形导致 MgB2 卢瑟福电缆 IC 退化的研究
DOI：
10.1109/tasc.2019.2911309
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Y. Makida et al.
中科院分区：
文献类型：
--
作者：
M. Jimbo;N. Kamibayashi;Y. Kuwabara;T. Yagai;T. Takao;T. Shintomi;Y. Makida et al.
mgb2超导体是应用于超导磁能存储和发电机等设备的有希望的候选者。要将mgb2导体应用于此类器件，导体的电流容量必须在千安培范围内。同时，由于mgb2导体在5t和4.2 K条件下的电流通常约为100a，因此需要使用多股绞合电缆。一个候选是卢瑟福式电缆。在卢瑟福电缆的制造过程中，为了保持电缆的形状，钢绞线的边缘会受到较大的弯曲应变而变形，而在平面部分则会受到滚轮模具压力的压痕。在卢瑟福型电缆的制造过程中，了解临界电流是如何降低的是很重要的。为了优化导线转位长度，制作了三种类型的卢瑟福电缆，并测量了弯曲应变和缩进应变对临界电流退化的影响。此外，为了研究降解，使用微聚焦x射线计算机断层扫描和电子探针微型分析仪观察了链的内部结构。
MgB2superconductors are promising candidates for application to devices such as Superconducting Magnetic Energy Storage, and generators. To apply MgB2conductors to such devices, the current capacity of a conductor must be in the kilo-ampere range. Meanwhile, because the current capacity of a MgB2conductor is typically approximately 100 A at 5 T and 4.2 K, multiple stranded cables are required. One candidate is the Rutherford-type cable. During the fabrication of Rutherford cables, strands are deformed by large bending strains at edge corners and indented at flat parts from the pressure of roller dies to maintain the cable shape. It is important to understand how critical current degrades during the fabrication of Rutherford-type cables. To optimize the strand transposition length, three types of Rutherford cables were fabricated and the critical current degradation depending on bending and indented strains was measured. Moreover, to investigate the degradation, inner structures of the strands were observed using micro-focused X-ray computed tomography and an electron probe micro analyzer.