5at.%Cu-Sn合金を用いて製作した多芯Nb₃Sn導体の超電導特性

抄録

The Nb₃Sn tape consisting of 27 filaments in a Nb matrix was made by means of the internal diffusion between a 5at.%Cu-Sn alloy and Nb. The Nb₃Sn layer could be formed in several hours and was found to have a critic al temperature of 17.6K. Overall current density of 2.0×10⁴A/cm² at 100kG was obtained for a suitably heat treated sample for which the ratio of Nb₃Sn to the composite was below 5%.