DEVELOPMENT OF TL-1223 CONDUCTORS FOR 77 K HTS APPLICATIONS

Tl-1223 conductors have been fabricated by the Powder-in-Tube (PIT) an d Surface-Coated Conductor (thick film) techniques. Current densities (J(c)) of 20,000 A/cm(2) and 12,000 A/cm(2) have been achieved at 77 K in short monofilament tapes and meter-long 37-filament tapes respecti vely, A large diameter test pancake coil was successfully fabricated w ith 17 m long PIT tapes, A new process has been developed to achieve g rain alignment in PIT Tl-1223, Critical currents of 18 A and a J(c) of 19000 A/cm(2) has been achieved at 77 K in surface-coated Tl-1223 con ductor fabricated by an industrial process.