Design of joint structure with electromagnetic forces in a remountable high-temperature superconducting magnet by quantification of joint resistance generating mechanism

为了实现具有高经济效率和可维护性的聚变反应堆，需要研究和开发可重新安装的高温超导（HTS）磁体的高温超导（HTS）导体的机械连接。基于超导理论和接触理论，对接头电阻的产生机理进行了量化，提出了一种接头电阻预测方法，用于研究大型导体机械接头的接头结构。此外，我们提出了机械桥和边缘接头作为新的机械接头，并通过实验和数值分析证明了接头的低接头阻力。在此基础上，对可拆装磁体的结构进行了优化设计，并通过对可拆装磁体在低温装置上运行的电功率计算，指出了可拆装磁体的可行性。

Research and development of mechanical joint of high-temperature superconducting (HTS) conductor are required for a remountable HTS magnet proposed to realize a fusion reactor having high economic efficiency and maintainability. In this research, joint resistance generating mechanism was quantified based on superconductivity and contact theories, then a method of joint resistance prediction needed to investigate joint structure for a mechanical joint of a large-scale conductor. In addition, we proposed mechanical bridge and edge joints as new mechanical joints and demonstrate low joint resistance with the joints using experiments and numerical analyses. Furthermore, we discussed the optimum structural design for a remountable magnet based on structural analysis and indicated feasibility of the remountable magnet based on calculation of electric power to run a cryo-plant.