Vlasov Simulations of Trapping and Inhomogeneity in Raman Scattering

Details Vlasov Simulations of Trapping and Inhomogeneity in Raman Scattering Vlasov Simulations of Trapping and Inhomogeneity in Raman Scattering

2005-08-17

arxiv.org/abs/physics/0508106v1

Physics

Plasma Physics

4 pages, 6 figures. Submitted to "Journal of Plasmas Physics" for the conference proceedings of the 19th International Confere

Scientific paper

10.1017/S0022377806005599

We study stimulated Raman scattering (SRS) in laser-fusion conditions with the Eulerian Vlasov code ELVIS. Back SRS from homogeneous plasmas occurs in sub-picosecond bursts and far exceeds linear theory. Forward SRS and re-scatter of back SRS are also observed. The plasma wave frequency downshifts from the linear dispersion curve, and the electron distribution shows flattening. This is consistent with trapping and reduces the Landau damping. There is some acoustic ($\omega\propto k$) activity and possibly electron acoustic scatter. Kinetic ions do not affect SRS for early times but suppress it later on. SRS from inhomogeneous plasmas exhibits a kinetic enhancement for long density scale lengths. More scattering results when the pump propagates to higher as opposed to lower density.

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