Abstract
The concept of face-cooled composite tape is proposed to stabilize high critical current densities in Nb/sub 3/Sn, V/sub 3/Ga, 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/sub 3/Sn-Cu system. The specimens are made by alternately stacking strips of Nb/sub 3/Sn 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/mm/sup 2/ is stabilized. The concept of face-cooled composite tape will offer a useful basic criterion in designing conductors of high-T/sub c/ oxides.
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