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Modélisation réaliste de l'instabilité de diffusion brillouin stimulée.

Abstract : Realistic modeling of the Stimulated Brillouin Scattering: To describe stimulated Brillouin scattering with the goal of a future predictive modeling in a large scale expanding plasma, we used a method based on a decomposition of the various functions characterizing the plasma into their long- and short wavelength components. It makes it possible to describe self-consistently the interplay between the plasma hydrodynamics , the propagation of the laser, the stimulated Brillouin scattering and the generation of the harmonics of the exited Ion Acoustic Wave. Using a benchmark in 1D and 2D between this method and a "complete" code without decomposition neither in hydrodynamics nor in the electromagnetic field, this methode proves to be very efficient in terms of computing time and very reliable. We also show a comparison between 2D simulations and LULI experiments with smoothed and single speckle laser beams in which we find similar level of reflectivity and the same localization in time and space of the SBS driven IAW. A possible extension of this fluid model to include ion kinetic effects is proposed, and the consequence on the decay of the SBS driven IAW in long-wavelength IAW is studied by comparisons between PIC -Hybrid simulations and fluid simulations.
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Submitted on : Wednesday, July 28, 2010 - 1:12:58 PM
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Paul-Edouard Masson-Laborde. Modélisation réaliste de l'instabilité de diffusion brillouin stimulée.. Physique [physics]. Ecole Polytechnique X, 2006. Français. ⟨pastel-00001913⟩

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