Abstract
The mechanism of a self-generated megagauss magnetic field by an amplitude modulated surface plasma wave (SPW) over a rippled metallic surface is proposed. The amplitude modulated SPW exerts a ponderomotive force on free electrons in the metallic ripple, giving them an oscillatory velocity at the modulation frequency. The oscillatory velocity couples with the electron density in metallic ripple and drives a nonlinear current J⃗(NL) with ∇×J⃗(NL)≠0. This irrotational nonlinear current generates the megagauss magnetic field.
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