Development of Fine Filament NbTi Superconducting Strands for ITER

摘要

The NbTi superconducting wires are used for the Poloidal Field (PF) coil of International Thermonuclear Experimental Reactor (ITER). Western Superconducting Technologies Co., Ltd. (WST) has produced conventional NbTi superconducting strand by single stacking for ITER. The final strands has been heat-treated with different duration. The properties of the NbTi strands meet the requirements to ITER PF strand specification. The diameter of the strand is 0.73 mm and filament diameter is 7.8 $mu{rm m}$. The multifilament composite strand is made up of Nb-Ti filaments embedded in a high purity Cu matrix. This paper presents the results of comparative investigations on critical currents(Ic), critical current density(Jc), AC losses of the strands.