Intrinsic Thermal Stability of Anisotropic Thin-Film Superconductors

[+] Author and Article Information
M. I. Flik, C. L. Tien

Department of Mechanical Engineering, Massachusetts Institute of Technology, University of California, Irvine, CA 92717

J. Heat Transfer 112(1), 10-15 (Feb 01, 1990) (6 pages) doi:10.1115/1.2910330 History: Received July 26, 1988; Online May 23, 2008


Intrinsic thermal stability denotes a situation where a superconductor can carry the operating current without resistance at all times after the occurrence of a localized release of thermal energy. This novel stability criterion is different from the cryogenic stability criteria for magnets and has particular relevance to thin-film superconductors. Crystals of ceramic high-temperature superconductors are likely to exhibit anisotropic thermal conductivity. The resultant anisotropy of highly oriented films of superconductors greatly influences their thermal stability. This work presents an analysis for the maximum operating current density that ensures intrinsic stability. The stability criterion depends on the amount of released energy, the Biot number, the aspect ratio, and the ratio of the thermal conductivities in the plane of the film and normal to it.

Copyright © 1990 by The American Society of Mechanical Engineers
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