Abstract
We developed advanced (Nb,Ti) 3 Sn multifilamentary superconducting wires with I mm in diameter and 3 km in length, which were reinforced and stabilized with Cu-20wt.%Nb composite, CuNb/(Nb,Ti) 3 Sn. In comparison with practical (Nb,Ti) 3 Sn wires with conventional Cu stabilizer, Cu/(Nb,Ti) 3 Sn, it is found that a 0.2 % proof stress of 240 MPa for CuNb/(Nb,Ti) 3 Sn after heat-treatment at 670 °C for 200 h is twice as strong as that for Cu/(Nb,Ti) 3 Sn. CuNb composite has good thermal conductivity of 200 W/m/K at 4.2 K and low resistivity of 0.16 μΩ.cm at 4.2 K and 15 T. The minimum quench energy of 2.7 mJ at 80 % of the critical current at 14 T for CuNb/(Nb,Ti) 3 Sn is a factor of two smaller than for Cu/(Nb,Ti) 3 Sn, while the normal zone propagation velocity of 2 m/s remains the same.
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