EXPERIMENT AND NUMERICAL-ANALYSIS OF NORMAL ZONE PROPAGATION PROPERTIES IN AG SHEATHED BI-2223 SUPERCONDUCTING TAPES

We measured operating temperature dependence of normal zone propagatio n velocity in longitudinal direction and thermal property with regard to Ag sheathed Bi-2223 superconducting single core and multifilamentar y tapes, Each experiment, with the test sample cooled by a cryocooler, covers the operating temperature range 10-40K and It/Ic range 0.4 sim ilar to 0.9 (where It is the transport current and Ic is tile critical current in each operating temperature, Top). And, we also carried out numerical analysis by a three-dimensional finite element method in or der to make dear the mechanism of normal zone propagation in high-temp erature superconducting (HTS) conductors.