Abstract
The rolling process of Bi-2223 tape conductors was optimized through the regressive analysis of experimental data. This procedure ensures the effective densification of the powder precursor in the core and homogeneous distribution of powder density in conductor cross section, thus shortening the rolling process. The Jc values were realized for the monofilament and 19-filament conductors processed by "powder in tube" method with one step intermediate rolling such as 3.1/spl times/10/sup 4/ A/cm/sup 2/ (77 K, OT) and 2.6/spl times/10/sup 4/ A/cm/sup 2/ (77 K, OT) respectively. Characteristics of single pancake coils are presented fabricated from 19-filament conductor: no Jc degradation was observed after 10 steps of thermocycling in the range between 77 and 293 K.
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