TRANSPORT-PROPERTIES OF BI2SR2CA1CU2OX/AG MULTIFILAMENTARY TAPE

Ag-sheathed Bi2Sr2Ca1Cu2Ox multifilamentary tapes with 19 and 55 cores were successfully fabricated by a powder-in-tube process, The multifilamentary tapes showed critical current densities J(c) of 1800 A/mm(2) (B//tape surface), 1070 A/mm(2) (B perpendicular to tape surface) at 4.2 K and 23 T, and 1710 A/mm(2) (B//tape surface) at 4.2 K and 30 T, showing a practical range of current carrying capacities. The maximum J(c), 4900 A/mm(2) (critical current I-c=550 A) was observed for a 55-filament tape at 4.2 It and 0 T. A single pancake coil fabricated using 3.5 m-long tape with 19 filaments carried 751 A, generating a maximum magnetic field of 1.9 T.