Samples of multifilamentary Bi-2223/Ag/alloy twisted filament tapes and Z stack round wires, consisting of untwisted and twisted stacks (or z-arrays) of flat filaments have been prepared. It was found that twist pitches of less than 10 mm may be incorporated into multifilament tapes while maintaining the Jc at 20 kA/cm/sup 2/. The self-field AC loss has been investigated at low frequencies up to 100 Hz. The round wire was found to exhibit isotropic electromagnetic properties.
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Darmann et al. (1999) studied this question.
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