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Vlasov simulations of trapping and inhomogeneity in Raman scattering

Published online by Cambridge University Press:  20 December 2006

D. J. STROZZI ,
M. M. SHOUCRI ,
A. BERS ,
E. A. WILLIAMS  and
A. B. LANGDON
D. J. STROZZI
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139, USA Lawrence Livermore National Laboratory (LLNL), Livermore, CA 94550, USA (dstrozzi@llnl.gov)
M. M. SHOUCRI
Affiliation:
Institut de Recherche de l'Hydro Québec, Varennes, Qc J3X1S1, Canada
A. BERS
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139, USA
E. A. WILLIAMS
Affiliation:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA 94550, USA (dstrozzi@llnl.gov)
A. B. LANGDON
Affiliation:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA 94550, USA (dstrozzi@llnl.gov)
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Abstract

We study stimulated Raman scattering (SRS) in laser-fusion plasmas with the Eulerian Vlasov code ELVIS. Backward SRS occurs in sub-picosecond bursts and far exceeds linear theory. Forward SRS and re-scatter of backward SRS are also observed. The plasma wave frequency downshifts from the linear dispersion curve, and the electron distribution flattens. This is consistent with trapping and reduces Landau damping. There is some acoustic ($\omega\propto k$) activity and possibly stimulated 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 towards a higher as opposed to towards a lower density.

Type
Papers
Information
Journal of Plasma Physics , Volume 72 , Issue 6 , December 2006 , pp. 1299 - 1302
Copyright
2006 Cambridge University Press

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