EFFECT OF MAGNETIC-FIELD, THERMAL CYCLING AND BENDING STRAIN ON CRITICAL-CURRENT DENSITY OF MULTIFILAMENTARY BI-2223 AG TAPE AND FABRICATION OF A PANCAKE COIL/

Multifilamentary HTSC tapes are important for their applications in va rious electrical devices. Powder-in-tube technique with improved optim ized synthesis parameters is regarded as one of the most promising way s to prepare long-length multifilamentary Bi-2223/Ag tapes. Neverthele ss, usefulness of such tapes depends on their electrical and mechanica l properties. Critical current density of a Bi-2223/Ag tape with 37 fi laments has been studied at 77 K with field, field orientation, therma l cycling and bending strain as parameters. Results have been discusse d in light of various mechanisms and models. A small pancake coil has been fabricated out of the same tape and the test results presented.