TRANSPORT CURRENT PROPERTIES OF SILVER-SHEATHED BIPBSRCACUO WIRE AND COIL

High J(c) silver-sheathed BiPbSrCaCuO superconducting wires have been developed. The maximum critical current densities at 77.3 K were 4.7 x 10(4) A cm-2 in zero magnetic field, 3.1 x 10(4) A cm-2 at 0.1 T and 1.1 x 10(4) A cm-2 at 1 T. At 4.2 K, the maximum critical curent density was 1.03 x 10(5) A cm-2 at 23 T. The anisotropy of critical current density for different magnetic field directions was only 30% at 4.2 K, even at 23 T. Long wires, for example a 60 m wire, were fabricated and different types of coils and conductors were made and tested over a wide temperature range from 4.2 to 77.3 K. This revealed that one could obtain coils generating over 1000 G, conductors transporting over 600 A at 77.3 K operation, current leads transporting over 1500 A with small helium consumption and superhigh field coils generating over 20 T at 4.2 K operation.