Evaluation of AC Losses for HT-7U CICC on Plasma Disruption

AC loss is one of the main issues in the design of the CICC used for PF and TF coils of superconducting tokamak. A preliminary calculation of AC loss for the designed HT-7U CICCs used for TF magnets is given in this paper. We only consider the hysteresis and coupling losses related to transversal and longitudinal kinds. In addition to the strand resistive barriers (Pb-30Sn-2Sb coating for NbTi strands), a stainless steel strip has been used inside these cables to reduce the AC loss in this kind of conductor. The available theory has enabled us to emphasize the role played by the stainless steel strip in the reduction of total AC losses in this kind of conductor. In this paper, it was shown that AC losses of cable were affected by the structure and change rate of magnetic field.