Stimulated Raman scattering of laser in a plasma in the presence of a co-propagating electron beam

Abstract

A relativistic electron beam co-propagating with a high power laser in plasma is shown to add to the growth of the stimulated Raman back scattering of the laser. The growth rate is sensitive to phase matching of electron beam with the plasma wave. In the case of phase mismatch, the growth rate drops by an order. The energy spread of the electron beam significantly reduces the effectiveness of the beam on the stimulated Raman process. V C 2013 AIP Publishing LLC.

Stimulated Raman scattering by circularly polarized quadruple Gaussian laser beam and co-propagating electron beam in plasma

“…The coupling between dispersed waves and the plasma wave enhances plasma wave growth through the ponderomotive force on electrons, leading to density perturbations and amplifying side-scattered waves. The instability growth rate is influenced by phase matching between electron plasma waves and the electron beam, with a phase mismatch reducing growth [44]. SRS saturation occurs when beam electrons' oscillation frequency exceeds the growth rate.…”

Stimulated scattering instability in a relativistic plasma

“…The nonlinear self-interactions of finite amplitude intense electromagnetic waves (EMWs) and relativistic/nonrelativistic plasmas have received a significant research attention in recent years (see, e.g., Refs. [1][2][3][4][5][6][7][8][9][10][11][12]. Such high-frequency (hf) EMWs are used for plasma heating, e.g., in inertial fusion plasmas [13], as well as for plasma diagnostics [14], e.g., in solid density plasmas that are created by intense laser and charged particle beams.…”