[WBP2] Bulk, Assembled Conductors, AC Loss

[WBP2-13] Research on the Application Performance of Superconducting Composite Cables for Tokamak Magnets

*Shaotao Dai¹, Tao Ma¹, Yangyang Shi¹, Lei Hu¹, Junfeng Yang¹, Bangzhu Wang¹ (1. Beijing Jiaotong University (China))

Keywords:

CORC-CICC,TSTC,Magnet,YBCO

High-temperature superconducting (HTS) composite cables exhibit exceptional current-carrying characteristics under strong background magnetic fields, making them one of the most promising candidates for tokamak magnet applications. In recent years, CORC (Conductor on Round Core) and TSTC (Twisted Stacked Tape Cable) superconducting composite cables have garnered significant attention due to their advantages of low AC loss and high mechanical strength, respectively. However, research on the application-specific properties of these two types of composite cables in fusion devices remains insufficient. Therefore, this paper addresses practical issues encountered in the application of both cable types in fusion devices. A systematic study was first conducted on the current-carrying capacity, transverse compression, axial tension, and bending properties of high-current CORC cables. Subsequently, the current-carrying performance, transverse compression, bending behavior, and joint resistance of CORC-CICC (Cable In Conduit Conductors) conductors fabricated from CORC sub-cables were investigated. The results demonstrate that CORC-CICC conductors possess excellent flexibility and mechanical properties, making them the preferred choice for manufacturing small scale fusion magnets. Additionally, the joint resistance developed in this study was measured to be less than 10 nΩ at liquid nitrogen temperature, meeting operational requirements. Furthermore, the current-carrying capacity, transverse compression, bending, and joint resistance of TSTC conductors were also studied. The results indicate that TSTC conductors exhibit favorable mechanical properties and are suitable for fabricating large scale coils in fusion magnets. The research presented in this paper provides valuable guidance for the application of CORC-CICC and TSTC conductors in fusion devices.