1.5 kA Bi-2223HTS current leads for SMES magnets

1.5 kA class Bi-2223 BTS current leads far superconducting magnetic energy storage(SMES) magnet were fabricated and tested, The HTS leads were compose d of Bi-2223/Ag-1 at%Au tapes fabricated by PIT process and stainless steel former and Shg were connected to conventional gas-cooled copper Leads. Usi ng a calorimetric method, heat input to the liquid helium through the HTS l eads was estimated to be 0.395 W/lead when the warm end part's temperature was 65 K which was slightly greater than the calculated value of 0.35 W/lea d. The measured critical current of the HTS leads was about 1.6 kA when the warm end part's temperature was 80 K. This measured value was wed consiste nt with computed values.