Development of Tl-1223 conductors for 77 K HTS applications

Tl-1223 conductors have been fabricated by the Powder-in-Tube (PIT) and 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 respectively, A large diameter test pancake coil was successfully fabricated with 17 m long PIT tapes, A new process has been developed to achieve grain 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 conductor fabricated by an industrial process.