Affiliation:
1. Physics Department, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
2. Lawrence Livermore National Laboratory, Livermore, California 94551, USA
Abstract
We investigate parametric processes in magnetized plasmas, driven by a large-amplitude pump light wave. Our focus is on laser–plasma interactions relevant to high-energy-density (HED) systems, such as the National Ignition Facility and the Sandia MagLIF concept. We present a self-contained derivation of a “parametric” dispersion relation for magnetized three-wave interactions, meaning the pump wave is included in the equilibrium, similar to the unmagnetized work of Drake et al., Phys. Fluids 17, 778 (1974). For this, we use a multi-species plasma fluid model and Maxwell's equations. The application of an external B field causes right- and left-polarized light waves to propagate with differing phase velocities. This leads to Faraday rotation of the polarization, which can be significant in HED conditions. Phase-matching and linear wave dispersion relations show that Raman and Brillouin scattering have modified spectra due to the background B field, though this effect is usually small in systems of current practical interest. We study a scattering process we call stimulated whistler scattering, where a light wave decays to an electromagnetic whistler wave ([Formula: see text]) and a Langmuir wave. This only occurs in the presence of an external B field, which is required for the whistler wave to exist.
Funder
U.S. Department of Energy
Cited by
2 articles.
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