Magnetization Loss and Current Transport Characteristics of SCSC Cables With Metal Cores

The SCSC cable is a low-ac-loss, robust, and high-current cable concept, in which copper-plated multifilament coated conductors are wound spirally on a core. Its copper connecting filaments electrically improves the robustness against local defect and local normal transition. Its spirally geometry plays an equivalent role to the twist geometry of low
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superconductors in order to decouple filaments and, then, to reduce magnetization losses effectively. We fabricated four-layer SCSC cables with metal cores, which are preferable from the viewpoint of current sharing to help quench protection, but in which eddy current loss might be generated under ac magnetic fields. In order to examine the influence of metal cores on the magnetization losses, we measured the magnetization losses in SCSC cables, whose cores were twisted copper wires (twisted bundle of copper wires) and a GFRP rod, as well as those in various cores themselves. We fabricated four-layer SCSC cables whose core was twisted bare copper wires, and examined its current transport characteristics in liquid nitrogen.