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Theses

Etude cinétique de l'instabilité Raman en plasma inhomogène par simulation numérique Vlasov semi-lagrangienne

Abstract : In the field of ICF, this thesis is about the numerical simulation of Raman instability through optical mixing. We used a semi-lagrangian Vlasov-Maxwell code allowing a fine description in phase space of the effects this type of plasma exhibits (likely to occur in future machines LMJ and NIF). We showed, both in homogeneous and inhomogeneous profiles, the effect of the convectively amplified probe wave, inducing weak turbulence in the plasma. It is associated with a nonlinear shift in frequency and wavevector of scattered modes, due to kinetic effects. This is preparing the plasma. Moreover, both forward Raman or Brillouin scatterings were taken into account. Therefore, we have been able to detect in various conditions low frequency (below the plasma frequency) electronic modes (KEEN) appearing through parametric coupling with other waves already in the plasma.
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Theses
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http://docnum.univ-lorraine.fr/prive/SCD_T_2005_0125_ALBRECHT_MARC.pdf
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https://hal.univ-lorraine.fr/tel-01746675
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Submitted on : Thursday, March 29, 2018 - 10:42:29 AM
Last modification on : Wednesday, March 24, 2021 - 10:22:02 AM

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  • HAL Id : tel-01746675, version 1

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Michel Albrecht-Marc. Etude cinétique de l'instabilité Raman en plasma inhomogène par simulation numérique Vlasov semi-lagrangienne. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2005. Français. ⟨NNT : 2005NAN10125⟩. ⟨tel-01746675⟩

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