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The formation of coarse Nb3Sn grains in Internal Tin (IT) strands has been studied at the example of a prototype strand with high Sn content. Metallographic examination revealed that the comparatively low critical current density (Jc) of this strand is partly due to the formation of a significant fraction of coarse grained Nb3Sn at the periphery of the individual filaments within the subelements....
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