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Coupled hydrodynamic model for laser-plasma interaction and hot electron generation.

A Colaïtis1, G Duchateau1, X Ribeyre1

  • 1Université de Bordeaux-CNRS-CEA, Centre Lasers Intenses et Applications, UMR 5107, 351 Cours de la Libération, 33400 Talence, France.

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Summary

This study introduces a laser-plasma interaction model accounting for hot electron generation and transport. The model reveals hot electrons significantly impact shock ignition experiments by increasing pressure and velocity.

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Area of Science:

  • Plasma Physics
  • Laser-Plasma Interactions
  • Hydrodynamics

Background:

  • Laser-plasma interactions (LPI) are crucial for inertial confinement fusion.
  • Accurate modeling of hot electron (HE) generation and transport is essential for understanding energy deposition.

Purpose of the Study:

  • To develop and present a multiscale, inline LPI-HE model.
  • To interpret shock ignition experiments using this new model.

Main Methods:

  • Coupling plasma hydrodynamics with linear and nonlinear LPI processes.
  • Incorporating laser beam refraction, diffraction, and absorption (collisional, resonant).
  • Modeling HE generation via stimulated Raman scattering, two-plasmon decay, and resonant absorption.
  • Describing HE transport using multigroup angular scattering approximation.

Main Results:

  • The model highlights the importance of target preheating by HEs.
  • Identified shortcomings of standard geometrical optics in intense laser pulse modeling.
  • HEs from parametric instabilities significantly increase shock pressure and velocity.
  • HEs decrease target strength and overall ablation pressure.

Conclusions:

  • The developed LPI-HE model provides a more accurate interpretation of shock ignition experiments.
  • Hot electron preheating plays a critical role in shock dynamics.
  • Advanced modeling is necessary for accurate prediction of intense laser-plasma interactions.