Pump depletion and the Raman gap in ignition-scale plasmas

TL;DR

This study uses 2D Particle-in-Cell simulations to explore laser-plasma interactions in inertial confinement fusion, revealing how stimulated Raman scattering causes pump depletion and spectral gaps consistent with experimental observations.

Contribution

It demonstrates the role of stimulated Raman scattering in pump depletion and spectral gap formation in ignition-scale plasmas using advanced simulations.

Findings

Stimulated Raman scattering causes significant pump depletion.

A spectral gap in Raman scattered light is observed.

Results align with experimental observations.

Abstract

Laser-plasma instabilities under ignition conditions for direct-drive inertial confinement fusion are studied using two-dimensional Particle-in-Cell simulations with a combination of in-plane (PP) and out-of-the-plane (SP) lasers. The results show that stimulated Raman side scattering can induce significant pump depletion and form a gap in the Raman scattered light spectra that have been observed in experiments.