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Elliptical drawing (ED) dies were used during the manufacturing process of Bi-2223/Ag superconducting tapes and their influence on the tapes’ homogeneity and critical currents (I c ) has been investigated. By comparing two types of HTS tapes drawn by ED dies and a set of reference round dies, we found that the ED process can improve the qualities of the rolled tapes, such as improving the...
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