Quenching of stimulated Raman scattering in the kinetic regime by external magnetic fields

Abstract

We show via particle-in-cell simulations that small normalized magnetic fields (${\omega }_c/{\omega }_p\ll 1$) applied perpendicularly to a light wave can significantly modify the evolution of backward stimulated Raman scattering (SRS) in the kinetic regime. The presence of the magnetic field increases the threshold for kinetic inflation and decreases the amount of reflectivity when SRS is driven significantly above threshold. Analysis indicates this arises because trapped electrons are accelerated as they surf across the wave, leading to the continual dissipation of the electron plasma waves over a wider range of wave amplitudes. The simulation parameters are directly relevant for SRS in inertial confinement fusion devices and indicate that approximately 30 Tesla magnetic fields might significantly reduce SRS backscatter.

References in corpus (6)

• One-to-one direct modeling of experiments and astrophysical scenarios: pushing the envelope on kinetic plasma simulations
• Control of Stimulated Raman Scattering in the Strongly Nonlinear and Kinetic Regime Using Spike Trains of Uneven Duration and Delay: STUD Pulses
• Optimal control of laser plasma instabilities using Spike Trains of Uneven Duration and Delay (STUD pulses) for ICF and IFE
• Imposed Magnetic Field and Hot Electron Propagation in Inertial Fusion Hohlraums
• Simulations of drastically reduced SBS with laser pulses composed of a Spike Train of Uneven Duration and Delay (STUD pulses)
• Convective Raman Amplification of Light Pulses Causing Kinetic Inflation in Inertial Fusion Plasmas

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• Magnetized Laser-Plasma Interactions in High-Energy-Density Systems: Parallel Propagation
• Enhanced collisionless laser absorption in strongly magnetized plasmas
• Intermittent excitation of parametric instabilities enhanced by synergistic effect in broadband laser plasma interaction