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Linear and Non-Linear EMP Diffusion Through a Ferromagnetic Conducting Slab
R AND D ASSOCIATES MARINA DEL REY CA
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The report investigates the shielding problem for the incident EMP in the form of a cylindrical TEM wave, such as a wire carrying a surge arrestor current terminated at an iron or steel shielding plane. Because of the large strength of the incident field, the nonlinear ferromagnetic saturation of the plate plays an important role in determining the peak and the shape of the shape of the transmitted field. This problem, based on and together with its one- dimensional plane-wave-incidence version, is solved analytically for a constant mu case. The analytical results are then used to partly predict and to interpret the numerical results for the one-dimension nonlinear case, obtained by using a finite difference code DIFUSN, and to help predict the behaviors for the cylindrical nonlinear case.
APPROVED FOR PUBLIC RELEASE