Title :
The magnetic stability of face-cooled composite tape superconductors
Author :
Chiba, M. ; Ogasawara, T. ; Miyazawa, N. ; Ban, S. ; Kubota, Y. ; Yasohama, K.
Author_Institution :
Coll. of Sci. & Technol., Nihon Univ., Tokyo, Japan
fDate :
3/1/1991 12:00:00 AM
Abstract :
The concept of face-cooled composite tape is proposed to stabilize high critical current densities in Nb3Sn, V3Ga, and oxides. The stability is promoted by the combined action of the dynamic stability and the transient cryogenic stability. The expression of the limiting current density of stability is derived as a function of pertinent parameters of the superconductor, stabilizing normal metal, and coolant. An experimental proof of the analysis is given for an Nb 3Sn-Cu system. The specimens are made by alternately stacking strips of Nb3Sn and copper. Stability is estimated by observing flux jumps for specimens of different thicknesses of copper. The experimental results agree well with the analysis. and an overall current density of about 500 A/mm2 is stabilized. The concept of face-cooled composite tape will offer a useful basic criterion in designing conductors of high-Tc oxides
Keywords :
composite superconductors; copper; critical current density (superconductivity); flux flow; niobium alloys; tin alloys; type II superconductors; Nb3Sn; Nb3Sn-Cu system; V3Ga; alternately stacking strips; dynamic stability; face-cooled composite tape superconductors; flux jumps; high critical current densities; limiting current density; magnetic stability; transient cryogenic stability; Coolants; Copper; Critical current density; Cryogenics; Current density; Magnetic flux; Niobium; Stability; Superconducting magnets; Tin;
Journal_Title :
Magnetics, IEEE Transactions on
