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Superconducting properties of internal-tin Nb3Sn wire with enhanced current capacity

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7 Author(s)
V. Pantsymyi ; Bochvar (A.A.) All-Union Sci. Res. Inst. of Inorg. Mater., Moscow, Russia ; A. Shikov ; A. Vorobieva ; S. Soudiev
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The possibilities for further enhancement of critical current density in internal tin Nb3Sn strands have been investigated. An appropriate modified design of internal-tin composite wire has been developed and samples of the wire have been fabricated and analyzed. It was shown that non-copper critical current density Jc attained 2000 A/mm2 (at 12 T, 4.2 K, 0.1 μV/cm) and the hysteresis losses were equal to 770 mJ/cm3 (for magnetic field varying in the range of ±3 T). The variations of the critical current density and hysteresis losses were investigated as a function of the wire diameter. The Nb3Sn layer microstructure has been investigated and the relationships between the microstructure parameters and superconducting properties have been discussed. The measurements of critical current were carried out at the temperatures from 4.2 K up to Tc and the results obtained are given

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:11 ,  Issue: 1 )