Abstract
Two-dimensional simulations with a hybrid code (kinetic particle ions and Boltzmann fluid electrons) have been used to investigate the saturation of stimulated Brillouin backscatter (SBBS) instability. The simulations address the interplay of wave breaking and ion trapping (and the associated nonlinear frequency shift of the ion wave and nonlinear modification of the kinetic dissipation), two-ion-wave decay instability, harmonic generation, and pump depletion in affecting SBBS saturation as a function of the population of resonant ions, which is controlled by ZTe∕Ti in a single ion species plasma (Z is the ion charge state and Te,i are the electron and ion temperatures). The role of ponderomotive filamentation in these simulations is also examined. The peak SBBS reflectivities in two dimensions relax to values that are much less than in one dimension. Two-dimensional physics facilitates higher ion wave dissipation rates (including significant residual ion Landau damping) that account for the relaxation and suppression of SBBS.
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