Particle Trapping in a Large-amplitude Ion Acoustic Wave in the Presence of Interspecies Collisions
Abstract
Trapping of particles in large-amplitude Ion Acoustic Waves is a ubiquitous process in the nonlinear evolution of many plasma instabilities such as Stimulated Brillouin Scattering (SBS), Collisionless Shocks, and Ion Streaming Instabilities. Recent work has proposed that multi-species plasmas composed of heavy, high-Z and light low-Z ions can be used in ICF experiments to suppress the growth of potentially damaging levels of SBS without significant loss of the radiation drive in indirect-drive hohlraums. This suppression relies on the validity of using linear Landau damping of the IAW by the light ions. However, if the SBS-driven IAW can trap the light ions, the suppression of SBS could be reduced. Here, we present kinetic simulations with NIF-relevant plasma conditions that show the scattering of light ions on the heavy ions maintains the Maxwell-Boltzmann form of the ion distribution and thereby the linear Landau damping assumption.
This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344 and funded by the Laboratory Research and Development Program project 17-ERD-081. Computing support came from the LLNL Institutional Computing Grand Challenge program.- Publication:
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APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- 2020
- Bibcode:
- 2020APS..DPPN06012B