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Journal Articles

Influence of wire parameters on critical current versus strain characteristics of bronze processed Nb$$_3$$Sn superconducting wires

Miyatake, Takayuki*; Murakami, Yukinobu*; Kurahashi, Hidefumi*; Hayashi, Seiji*; Zaitsu, Kyoji*; Seeber, B.*; Mondonico, G.*; Nabara, Yoshihiro

IEEE Transactions on Applied Superconductivity, 22(3), p.4805005_1 - 4805005_5, 2012/06

 Times Cited Count:6 Percentile:40.45(Engineering, Electrical & Electronic)

In order to develop bronze processed Nb$$_3$$Sn strands for ITER TF and CS coils, the influences of various parameters of Nb$$_3$$Sn strands such as filament diameter, barrier materials, barrier thickness, heat treatment pattern and Ti addition on critical current ($$I_c$$) vs. axial strain $$epsilon$$ $$(-0.8% <epsilon < +0.1%)$$ characteristics were investigated. The change of theses parameters brought significant changes to superconducting properties involving $$I_c$$ and n-value at zero applied strain. In spite of different strand parameters, the strain dependency of normalized $$I_c$$ was almost the same, except for Ti-addition affecting the critical field $$B_{c2}$$. Based on the results, bronze processed Nb$$_3$$Sn strands with non-Cu critical current density more than 1,100 A/mm$$^2$$ at 12T, 4.2K have been successfully developed for the CS coil.

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