Electron Bernstein wave excitation by beating of two copropagating super-Gaussian laser beam in a collisional nanocluster plasma

Abstract

An analytic formalism is developed to study electron Bernstein wave excitation by two copropagating high power super-Gaussian laser beams in a collisional nanocluster plasma. The medium is assumed to contain spherical plasma plume ball of nanocluster. As the electric field of two laser beams interact with nanoclustered plasma, it would cause the beat wave frequency ω=ω1−ω2. The laser beat wave exerts a nonlinear pondermotive force on electron cloud of clustered plasma that in turns lead to excite the electron Bernstein wave in the laser field polarizations direction. The effective finite y-component of the beat wave experiences group velocity and it might cause convective losses. The spatial shape of electron Bernstein wave normalized potential and power profile promises better excitation mechanism in nanoclustered plasma as compared to only plasma medium. It is observed that excitation is much enhanced when the laser beat frequency lies near the effective plasmons frequency of nanoclustered plasma. The excitation is detuned by varying the laser mode index, clustered radius, collisional frequency, parameter b. One may apply this theory of electron Bernstein wave excitation in toroidal fusion devices.