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Ag-sheathed Bi2Sr2Ca1Cu2O x 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/mm2 (Bł tape surface), 1070 A/mm2 (B⊥ tape surface) at 4.2 K and 23 T, and 1710 A/mm2 (Bł tape surface) at 4.2 K and 30 T, showing a practical range of current carrying capacities. The maximum J c, 4900 A/mm2 (critical current I c=550 A) was observed for a 55-filament tape at 4.2 K 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.
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Okada et al. (1995) studied this question.
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