Study on the plasma density profile deformation under the action of ponderomotive force in nonstationary conditions

Numerical technique for solution of one-dimensional problem concerning plasma density profile deformation under the effect of ponderomotive force of high-frequency electromagnetic radiation under nonstationary conditions has been developed. It is shown that chosen difference scheme describes the known analytical results with high accuracy (≤ 3%), namely stimulated Brillouin backscattering from uniform plasma layer, stationary solution of problem concerning density profile twisting. Results of calculations of density profile deformation testifying to jump instability at >0.1 ns pulse duration are presented. 9 refs.; 4 figs