Abstract
Thick and uniform Nb3Sn layers containing Ta with excellent high-field performance are synthesized through the reaction between a Ta-Sn core and a Nb-based alloy sheath. A small amount of Cu addition to the core reduces the reaction temperature. The effect of amount of Cu addition to the core on the reaction temperature, microstructure and high-field performance of the conductor has been studied changing the Ta/Sn composition ratio of the core. A variety of Jc versus magnetic field performance has been obtained by adjusting the amount of Cu addition to the core and the reaction temperature in the present Nb3Sn conductors. Furthermore, the effect of the sheath material on the structure and high-field performance of the conductor has been studied. Results obtained in the Nb-2at%Ti sheath specimen were compared with those obtained in the Nb-4at%Ta sheath specimen. A clear line composed of Cu-Ti precipitates separates the Nb3Sn layer into two zones, when a small amount of Cu is added to the core of the Nb-2at...
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