Development of evaluation procedure for superconductivity of CIC conductor for fusion reactor

Kajitani, Hideki; Ishiyama, Atsushi*; Agatsuma, Ko*; Murakami, Haruyuki; Hemmi, Tsutomu; Koizumi, Norikiyo

The cable in Conduit (CIC) conductor using NbSn strand is applied to ITER TF coil. The performance of CIC conductor is degraded due to electromagnetic force. This is because a strand in the conductor is applied periodically bending strain by the electromagnetic force and then the performance is degraded. Strands in the conductor are complicatedly touched each other due to twisting and the electromagnetic force is transferred via another strand, which lead to complicate bending strain distribution in the conductor. The author thus developed a new model for the evaluation of bending strain distribution in the conductor taking these phenomenon into account. As a result, this development could lead to more precise evaluation of the conductor performance.