Article
Analysis of Nb3Sn structural and electrophysical superconductor characteristics under simulated deformation manufactured by the Internal Tin Process
N. V. Konovalova
JSC «Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar», (JSC VNIINM),123098, Moscow, Russia
e-mail: NViKonovalova@bochvar.ru
I. M. Abdyukhanov
JSC «Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar», (JSC VNIINM),123098, Moscow, Russia
A. S. Tsapleva
JSC «Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar», (JSC VNIINM),123098, Moscow, Russia
I. I. Savelev
JSC «Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar», (JSC VNIINM),123098, Moscow, Russia
M. V. Alekseev
JSC «Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar», (JSC VNIINM),123098, Moscow, Russia
K. A. Mareev
JSC «Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar», (JSC VNIINM),123098, Moscow, Russia
D. S. Novosilova
JSC «Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar», (JSC VNIINM),123098, Moscow, Russia
Abstract
The results of a study on multifilamentary Nb3Sn superconductors fabricated by the internal tin method with a common barrier are presented. Two experimental strand of superconductors, differing in the number of subelements, with diameters of 1.0 mm and 0.82 mm, were manufactured. The influence of design parameters on the microstructure, critical current density, RRR parameter, and hysteresis losses was investigated. It was established that an increase in the number of subelements leads to an increase in the critical current density in a magnetic field of 12 T. Decreasing the superconductor diameter distorts the subelement geometry and an increase hysteresis loss. Copper separators was not provide a significant reduction hysteresis losses due to their deformation during the drawing process. The most effective approach to loss reduction is the use of separators made of resistive materials, for example, the Cu-Mn alloy, which prevent electromagnetic coupling between the filaments.
Keywords: superconductor; strand; Nb3Sn; microstructure; hysteresis losses; internal tin.
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