Abstract
The effects of metallurgical processing on 60 Hz ac losses and dc critical currents in Nb 3 Sn tapes fabricated by the solid state diffusion technique were investigated. An addition of Al to the Cu-Sn alloy for the matrix resulted in large reduction in the ac losses of Nb 3 Sn tapes, but the highest linear critical current densities were observed in Nb 3 Sn tapes produced with a Nb-1 wt% Zr core in a Cu-13 wt% Sn matrix. Values of the losses and the critical currents in these tapes can meet the present requirements for the ac superconducting power cables.
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