Title :
The critical current of Nb3Sn wires for ITER as a function of the axial tension and compression
Author :
Ten Haken, Bennie ; Godeke, Arno ; Ten Kate, Herman H J ; Specking, Werner
Author_Institution :
Low Temp. Div., Twente Univ., Enschede, Netherlands
fDate :
7/1/1996 12:00:00 AM
Abstract :
The influence of compressive and tensile axial strains on the critical current of various Nb3Sn conductors is investigated. The investigated multifilamentary wires are especially developed for the ITER project. The critical current is determined as a function of an axial tension in a standard pull set-up. These results are compared with the results that are obtained on a bending spring-type strain device. In this second device an axial compression larger than the integral thermal shrinkage of the matrix, can be achieved. A study of the field dependence of the critical current yields the strain dependence of the extrapolated upper-critical field versus the axial strain. A good correlation is found between the two different strain devices in the tensile strain regime. There is a difference in the (limited) compressive strain regime where such a comparison can be made
Keywords :
critical current density (superconductivity); fusion reactor materials; multifilamentary superconductors; niobium alloys; stress-strain relations; superconducting critical field; superconducting magnets; tin alloys; type II superconductors; ITER; Nb3Sn; Nb3Sn wires; axial compression; axial tension; bending spring-type strain device; compression; critical current; extrapolated upper-critical field; field dependence; integral thermal shrinkage; multifilamentary wires; standard pull set-up; Capacitive sensors; Conductors; Critical current; Force measurement; Magnetic field induced strain; Niobium; Springs; Strain measurement; Tin; Wires;
Journal_Title :
Magnetics, IEEE Transactions on
