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Modelling of magnetic properties and AC losses in high-Tc superconductors using a power law current-voltage characteristic
Date
1999
Abstract
This article presents numerical diffusion models which describe the electromagnetic properties and alternate current (ac) losses of a high-Tc superconducting tape carrying transport current. The models simulate the tape as a highly nonlinear conductor with equivalent resistivity being a function of J, the local current density, as deduced from a power law E–J characteristic of the material. The power law E–J expression can be adjusted by varying both the power, a, and the value of the critical current density, Jc , to accurately fit the current–voltage characteristic of a given high-Tc superconducting tape, as obtained from direct current measurements. Results of various field quantities, in the interior of the tape, and losses for a range of ac currents and frequencies are presented and discussed in conjunction with the critical state, flux creep, and flux flow theories of high-Tc materials
Supervisor
Description
peer-reviewed
Publisher
American Institute of Physics
Citation
Journal of Applied Physics;85, (8), pp. 5359-5361
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Files
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Mahdi_1999_modeling.pdf
Adobe PDF, 339.77 KB