Abstract
Bismuth-based, silver-sheathed tapes are considered to have great possibilities for electric power applications. Remarkable progress in Bi-2223/Ag tapes has been made in the world. We also have been developing Bi-2223/Ag tape since 1989, and we can fabricate 1 km length tape now. One of the important properties for J c of Bi-2223/Ag tape is the distribution in the cross-section of tape, as well as that of longitudinal distribution. We measured J c distribution in the cross-section of tapes that were cut in the constant period from the edge of tape by using laser beam. It was cleared that J c increased periodically toward the center of the tape but J c slightly decreased at the center. We consider that J c distribution in the tape has good correlation with the density of filament. By this result, we succeeded in manufacturing the long Bi-2223/Ag–AgMg tape of J c =31 000 A/cm 2 and J e=8000 A/cm 2. Furthermore, we achieved I c=50 A in Bi-2223/Ag–AgMg twisted long tape.
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