1989•OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)Open access
A method for generating the J sub c, B, T surface for niobium-alloy superconductors
Michael A. Green
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Abstract
This report shows how the J/sub c/, B, T surface can be created for various niobium-alloy superconductors using a reduced critical state model. Using this method, one can calculate the J/sub c/ of the superconductor over a range of B and T given the J/sub c/ at 4.2 K over a limited range of B. The calculated value of J/sub c/ agrees favorably with measured values over a range of temperatures from 1.5 to 7.0 K and a range of inductions from 0.1 to B/sub c2/. This method has been applied to various niobium-titanium-alloys, niobium-zirconium and niobium-tantalum-titanium. The paper compares calculated values of J/sub c/ with measured values of J/sub c/ for niobium-alloy superconductors manufactured since 1965. As an illustration, a computer generated J/sub c/, B, T surface is presented for some of the superconductors. 15 refs., 10 figs.