Nonlinear kinetic estimate of Raman reflectivity in a hohlraum plasma with a radiation hydrodynamics code

Area of Science:

• Plasma Physics
• Laser-Plasma Interactions
• Computational Physics

Background:

• Stimulated Raman scattering (SRS) is a key process in laser-plasma interactions, significantly affecting energy transfer and plasma behavior.
• Accurate modeling of SRS requires incorporating nonlinear kinetic effects and their feedback on plasma hydrodynamics.
• Existing models often lack predictive capability or require empirical adjustments to match experimental observations.

Purpose of the Study:

• To introduce a novel inline model for SRS, named PIEM (PredIctivE Model), designed for radiation hydrodynamics codes.
• To incorporate nonlinear kinetic effects and their feedback on plasma hydrodynamics within the SRS model.
• To validate the predictive accuracy of PIEM against experimental measurements.

Main Methods:

• Development of an inline SRS model integrated into the radiation hydrodynamics code troll.
• Implementation of algorithms to account for nonlinear kinetic effects.
• Incorporation of the SRS feedback mechanism on plasma hydrodynamics.
• Comparison of model predictions with experimental data from Ligne d'Intégration Laser.

Main Results:

• The PIEM demonstrates accurate prediction of SRS phenomena, aligning well with experimental measurements.
• The model successfully captures the influence of nonlinear kinetic effects on SRS.
• No free parameters were required for post-experimental adjustment, confirming the model's predictive nature.

Conclusions:

• PIEM provides a robust and predictive tool for simulating SRS in laser-produced plasmas.
• The model's ability to include nonlinear kinetic effects enhances the understanding of SRS dynamics.
• PIEM's validation against experimental data confirms its utility for future research in inertial confinement fusion and related fields.