Title :
Superconducting properties of internal-tin Nb3Sn wire with enhanced current capacity
Author :
Pantsymyi, V. ; Shikov, A. ; Vorobieva, A. ; Soudiev, S. ; Silaev, A. ; Kozlenkova, N. ; Beliakov, N.
Author_Institution :
Bochvar (A.A.) All-Union Sci. Res. Inst. of Inorg. Mater., Moscow, Russia
fDate :
3/1/2001 12:00:00 AM
Abstract :
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
Keywords :
critical current density (superconductivity); magnetic hysteresis; multifilamentary superconductors; niobium alloys; tin alloys; type II superconductors; 12 T; 4.2 K; Nb3Sn; critical current density; current capacity; hysteresis losses; internal-tin Nb3Sn wire; microstructure; wire diameter; Critical current; Critical current density; Current measurement; Magnetic fields; Magnetic hysteresis; Microstructure; Niobium; Superconducting epitaxial layers; Superconducting filaments and wires; Tin;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
