PROCESSING AND TRANSPORT-PROPERTIES OF HIGH-J(C) SILVER-CLAD BI-2223 TAPES AND COILS

The powder-in-tube process has been used to fabricate long lengths of flexible, high-J(c), silver-clad Bi-2223 HTS conductors. By improving thermomechanical processing and precursor powder preparation, we have succeeded in achieving J(c) values of greater-than-or-equal-to 4 x 10(4) A/cm2 at liquid nitrogen (77K) temperature and >10(5) A/cm2 at liquid helium (4.2K) and liquid neon (27K) temperatures in short tape samples. Detailed measurements with high applied magnetic fields are reported. Several long tapes up to 10 m in length have also been fabricated and cowound into small superconducting pancake coils by the ''wind-and react' approach. Transport measurements at 77 and 4.2K for these coils are also reported.