Normal Zone Propagation Velocity in 2G HTS Coated Conductor With High Interfacial Resistance

A fast normal zone propagation velocity (NZPV) in second-generation (2G) high-temperature superconductor (HTS) coated conductors (CC) is desirable in order to prevent the appearance of destructive hot spots upon a local quench. It was predicted theoretically that an increase of the interfacial resistance between the superconductor and the stabilizer would enhance the NZPV of 2G HTS CC due to the longer current transfer length between the superconductor and the stabilizer. In this paper, the dependence on current amplitude of the NZPV of 2G HTS CC having different interfacial resistances was measured experimentally. Our results indicate that the NZPV is enhanced by two orders of magnitude when the interfacial resistance is increased by three orders of magnitude.