Critical current density of bronze-processed multifilamentary Nb3Sn wires with magnesium addition to the matrix

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Abstract
The effects of the addition of magnesium to the bronze of a bronze‐processed multifilamentary Nb3Sn conductor were studied. The bronze composition was varied from Cu‐6.7 Sn‐0.0 Mg to Cu‐6.7 Sn‐0.62 Mg. The magnesium was found to refine the Nb3Sn grain size and improve the critical current density of the superconductor. The most heavily doped wire had an optimum critical current density three to six times better than the Mg‐free control wire at all fields.