Title :
Experimental verification of the temperature and strain dependence of the critical properties in Nb3Sn wires
Author :
Godeke, A. ; Krooshoop, H.J.G. ; Knoopers, H.G. ; Ten Haken, B. ; ten Kate, H.H.J.
Author_Institution :
Fac. of Appl. Phys., Twente Univ., Enschede, Netherlands
fDate :
3/1/2001 12:00:00 AM
Abstract :
The critical current density in Nb3Sn conductors is described with an improved scaling formula for the temperature, magnetic field and strain dependence. In an earlier study, it is concluded that the largest uncertainties in this description arise from the temperature dependence that is described with various slightly different empirical relations. For the optimization of the numerical codes, used to predict the stability of large magnet systems, a more accurate description is required. Therefore, two different bronze processed conductors for the ITER CS model coil are analyzed in detail. The critical current is measured at temperatures from 4.2 K up to the critical temperature, in magnetic fields from 1 T to 13 T and with an applied axial strain from -0.6% to +0.4%. The axial strain is applied by a U-shaped bending spring and a comparison is made between brass and Ti-6Al-4V, as substrate material
Keywords :
critical current density (superconductivity); magnetic fields; niobium alloys; superconducting cables; superconducting coils; superconducting magnets; thermal analysis; tin alloys; 1 to 13 T; 4.2 K; ITER CS model coil; Nb3Sn; Nb3Sn conductors; Nb3Sn wires; U-shaped bending spring; applied axial strain; bronze processed conductors; critical current density; empirical relations; magnetic field; magnetic fields; scaling formula; strain dependence; temperature; Capacitive sensors; Conductors; Critical current density; Magnetic field induced strain; Magnetic field measurement; Niobium; Strain measurement; Temperature dependence; Temperature measurement; Tin;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
