Evaluation of transport performance and current distribution of HTS current lead prepared by the TFA-MOD processed YBCO tapes

Abstract – HTS current lead have been prepared by the TFA-MOD processed YBCO tapes. A current lead unit is composed of eight YBCO tapes, Cu end caps and a pair of stainless steel boards. The YBCO tape is 5 mm in width and around 108 μm in overall thickness. The YBCO superconducting layer with 1.5 μm is formed on oxide buffered layers on Hastelloy substrate tape. The critical current of eight YBCO tapes ranges from 160 to 180 A at 77 K and self-field. The transport current of 750 A at 77 K was stably carried with no voltage generation on the YBCO tapes of the current lead. Rogowski coils and Hall sensors were attached on eight YBCO tapes to evaluate current distribution of the current lead. The current imbalance of 8 A occurred between eight YBCO tapes at transport current of 700 A.