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An internal-tin route Nb3Sn superconducting wire that has both remarkably low hysteresis loss (Qh) and high critical current density (Jc) was developed according to a new design idea. The wire was constructed by arranging the filaments in a radial layout, enlarging the outer filaments along the radial direction, intentionally narrowing the filament spacing in the radial direction, and enlarging the...
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