Design of the 100 kA High Temperature Superconducting Current Lead for CFETR

Because high-temperature superconductors have good electrical conductivity and low thermal conductivity in the superconducting state, the China Fusion Test Reactor (CFETR) under construction will use high-temperature superconducting current leads. Under this background, the relevant numerical calculation and design analysis of the 100 kA high-temperature superconducting current lead were carried out. The resistive section consists of a phosphorus de-oxidized copper conductor and heat exchanger and the HTS section is constructed from SEI's Bi2223 tapes. The analysis results show that the overcurrent capability of the current lead is more than 120 kA, the 5 K cold-end leakage heat is less than 25 W, the LOFA time is about 580s, and the overheating running time is about 35s, which meets the design requirements.