PERFORMANCE OF HIGH-TEMPERATURE SUPERCONDUCTING COILS IN HIGH BACKGROUND FIELDS AT DIFFERENT TEMPERATURES

Application of High Temperature Superconductors (HTS) to devices requires a detailed understanding of the effects of temperature, magnetic field and orientation of magnetic field on the critical current density. Measurements of the critical surface of PbBSCCO were made on long lengths of fully reacted multi-filamentary wire wound into solenoids. These react & wind coils were tested in magnetic fields to 20 tesla and temperatures from 1.8 K to 77 K Overall current densities of 200-300 A/mm2 were achieved at fields of 20 T. The effect of high electromagnetic forces on performance of high temperature superconducting (HTSC) coils is analyzed and compared with analytical models for the HTSC conductor and coil winding.