Abstract
We have designed and manufactured a large capacity of Superconducting Nb-Ti conductors for AC (50Hz) use. The conductor is a triply-stacked multi-strand (6×6×12) type. The elementary strand has Nb-Ti filaments of 0.15μm diameter in Cu-Ni matrix, and Cu stabilizer divided into 19 parts, surrounded by Cu-Ni barrier, located in the center of a strand and Cu filaments in the peripheral of filamentary region. The twist pitch and direction of a strand and conductor is designed to minimize a magnetic instability due to a longitudinal field along the strand. The performances of the conductor in 0.5Tpeak, 50Hz field were as below. The maximum current and current density was 10.6kArms and 167Arms/mm2. The attained level of the current is nearly 100% of the critical one on the load line.
