Kinetics of the Raman instability in laser plasma

Abstract

The phase-space evolution in a non-relativistic and homogeneous laser plasma in the presence of the stimulated Raman scattering is studied. Transform method is used for a solution of the set of partial differential equations which consists of the Vlasov equation and of the full set of Maxwell equations in a 1D model. Numerical instability of the Fourier-Hermite representation is described and discussed. To overcome numerical instabilities during the simulation, a simplified Fokker-Planck collision term is employed. In the collisionless case the solution is pushed to the practicable limit and the initial phase of particle trapping and acceleration in the potential wells of the electrostatic wave accompanying the Raman backscattered wave was recorded. Also the growth of the electrostatic partner of the Raman forward scattered wave was observed.PACS: 52.38.Kd

Stimulated Raman scattering in the presence of trapped particle instability

“…(1)-(4) is a closed set of equations, which was solved numerically by the transform method [8,9]. Even if we are aware of more modern methods to solve the Euler-Vlasov system in the phase space [10], which is less computationally demanding and achieves a stabilization by averaging over the numerical grid, we resorted to the transform method, since the stabilization by the averaging is at the cost of entropy non-conservation.…”

Intensity dependence of electron gas kinetics in a laser corona

“…with trapped particle instability) and thus complicate the physical situation. For a more detailed information see [4]. …”