Investigation of the magnetization and the twist pitch effect on critical current density in Nb/sub 3/Sn wires of different designs

Author

Nikulin, A. ; Shikov, A. ; Uorobjova, A. ; Chukin, A. ; Silaev, A.

Author_Institution

A.A. Bochvar Inst. of Inorg. Mater., Moscow, Russia

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

1595

Lastpage

1598

Abstract

The effect of the twist pitch on the current carrying capacity in magnetic fields of 1-12T on multifilamentary superconductors of different designs based on Nb/sub 3/Sn, that had been made by means of the bronze technique and have different parameters: volume fraction of Nb in bronze matrix (VFNb), number of filaments, wire and filaments diameters, presence of stabilization, has been studied. It has been stated that after twist pitch reaching 6d-9d mm, where d is the wire diameter, a considerable decrease of current carrying capacity in conductors of all the types (except for wires with low VFNb, less than 0.1) is observed. The application of twisting modes with the intermediate heat treatment that restores the twisted conductors plasticity, made it possible to eliminate the current carrying capacity degradation. Also, we present magnetization data and hysteresis losses in conductors of different designs.<>

Keywords

critical current density (superconductivity); fusion reactor design; fusion reactor materials; fusion reactors; heat treatment; magnetic hysteresis; magnetic leakage; magnetisation; multifilamentary superconductors; niobium alloys; superconducting coils; superconducting magnets; tin alloys; type II superconductors; 1 to 12 T; ITER coil; Nb/sub 3/Sn; Nb/sub 3/Sn wires; bronze technique; critical current density; current carrying capacity; hysteresis losses; intermediate heat treatment; magnetic fields; magnetization; multifilamentary superconductors; stabilization; twist pitch effect; type II superconductors; volume fraction; Conductors; Critical current density; Degradation; Heat treatment; Magnetic hysteresis; Magnetization; Multifilamentary superconductors; Niobium; Tin; Wire;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402878

Filename

402878