Stability Analysis of Advanced Superconductors for Helical Devices

Cable-in-conduit superconductors are considered as a conductor for future helical devices. A cable-in-conduit superconductor consists of multi-strand cable and conduit. The stability of multi-strand superconducting cable is investigated in consideration of the current redistribution between strands. We studied basically the current redistribution phenomena in two-strand cable by experiment, and have developed the numerical method to simulate the current redistribution phenomena of the cable. As a result of a numerical analysis, it was found that the current redistribution phenomena depend on coolant conditions. In this paper, effects of the coolant condition on the current redistribution phenomena and the stability of the superconducting cable will be discussed.