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

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

1656

Lastpage

1659

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-T_c 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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133505

Filename

133505