ADVANCES IN THE DEVELOPMENT OF HTS COMPOSITE CONDUCTORS

The performance of high-temperature superconductor (HTS) composite con ductors is rapidly advancing. Filament current densities of greater th an 32,000 A/cm(2) (77 K, self field, 1 mu V/cm) have been achieved in multifilamentary composite conductors prepared with scaleable powder i n tube techniques. This has allowed the fabrication of composite condu ctors with overall conductor current densities of 9100 A/cm(2). These advances are being applied to the manufacture of composite conductors with lengths in excess of 1 km and filament currents densities of 8900 A/cm (77 K, self field, 1 x 10(-11) Omega-cm). Recent advances in the development of high J(c) composite conductors will be reviewed. The p erformance and characterization of long length conductors will be desc ribed and the integration of these conductors into practical applicati ons will be reported.