Improvement of performance of conduction cooled LTS pulse coils by using low temperature superconducting wires with high resistive matrix

预计该公司将开发保护一些生产工厂免受瞬时电压下降影响的设备，例如半导体生产工厂。这些设备需要在1秒内输出几毫瓦的功率。作为候选之一，利用低温超导(LTS)导体缠绕的传导冷却超导脉冲线圈的超导磁存储系统(SMES)是有望实现的。开展了低成本导冷LTS脉冲线圈的研制工作。在使用成本最低的NbTi线的情况下，已经表明，使用CuNi等具有高阻矩阵的超导导体可以低成本地制造脉冲线圈。结果表明，在使用铜稳定的高稳定性NbTi线材的情况下，使用NbTi带材和优化从超导导体到线圈结构的热扩散都可以改善线圈的性能。此外，还对有望在20K下使用的硼化镁线材的性能改进进行了研究。用小样本的镁B2带材进行的实验表明，从圆形到带状的横截面形状的变形对提高线材的性能具有重要意义。此外，还研究了如何充分利用硼化镁带材的设计方法。该线圈由两条带组成的平行导线缠绕而成，可产生3T的磁场。实验表明，该线圈能够稳定驱动。

It is expected to develop the devices for protection of some production plants, such as semiconductor production plants, from momentary voltage drops. These devices are required to output the power of several MW for 1 second. As one of candidates, superconducting magnetic storage systems (SMES) using conduction cooled superconducting pulse coil wound with low temperature superconducting (LTS) conductors, are expected. The study has been carried out to develop the conduction cooled LTS pulse coil with low cost. In case of using NbTi wires which are produced with the lowest cost, it has been shown that pulse coils can be fabricated with low cost by using the superconducting conductors with high resistive matrix such as CuNi. In case of using Cu stabilized NbTi wires with high stability, it is shown that coil performance can be improved by both of using NbTi tapes and optimizing thermal diffusions from superconducting conductors to coil structures. In addition, improvement of performance of the MgB2 wires which are expected to use at 20K has been studied. It has been cleared that deformation of cross-sectional shape from the round shape into the tape shape is valuable for improvement of the wire performance from experiments using short samples of MgB2 tapes. Moreover, the design method to make the best use of the MgB2 tapes has been studied. The coil which can generate 3T of magnetic field has been wound by the parallel conductor composed of two tapes. It has been shown experimentally that the coil can drive stably.