Evaluation of performance of CIC conductor for ITER TF coil

Kajitani, Hideki; Murakami, Haruyuki; Hemmi, Tsutomu; Koizumi, Norikiyo; Nakajima, Hideo

The critical current of a cable-in-conduit conductor (CICC) for an ITER TF and CS coil has been measured using the SULTAN test facility. However, it was found that the measured critical current was lower than that evaluated from the critical current performance of a single strand. One of the explanations for this phenomenon is (1) a bending to strand generated by electromagnetic force and (2) a local degradation of strand due to the feature of SULTAN test facility. In this study, we mainly (1) established the model to simulate the bending to strand due to electromagnetic force. Using this model, we calculated a current distribution in the conductor and studied the degradation of conductor performance. As the result, the current distribution was almost uniform and non-uniform voltage distribution as in the tests did not occur. It means that mainly a (2) local degradation may generate non-uniform voltage distribution. We will also study this influence in the near the future.