Transport properties of Bi-2212/Ag multifilamentary composite tape in high magnetic fields

Silver sheathed Bi-2212 multifilamentary tapes with 19-55 cores were successfully developed through the continuous pressing followed by a partial melting process. The multifilamentary tapes showed J(c)'s of 1800 A/mm(2) (B parallel to tape face) and 1100 A/mm(2) (B perpendicular to tape) at 4.2 K and 23 T, showing a practical range of current carrying capacities. The maximum J(c), 4900 A/mm(2) (I-c = 550 A), was observed for a 55-filament tape at 4.2 K and 0 T. A single pancake coil using 3.5 m long tape generated a maximum magnetic field of 1.9 T, showing a possibility for realizing over ST-class coils.