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Laser propagation in a subcritical foam: Subgrid model by M. A. Belyaev; R. L. Berger; O. S. Jones; S. H. Langer; D. A. Mariscal; J. Milovich; B. Winjum is a Physics and Astronomy article available to read on EtoBox.

What is Laser propagation in a subcritical foam: Subgrid model about?

We present a subgrid model for laser propagation in a subcritical foam. Our model describes the expansion of laser-irradiated foam elements that are below the resolution of the simulation grid and predicts the plasma conditions that result from burning down the foam. Our model can be included as a module within a larger multiphysics code, and we have implemented it within the code pF3D, which is used for simulating a laser-plasma interaction. The model predicts a reduced propagation velocity for a laser through a subcritical foam compared to simulating that foam as a homogeneous gas. This is attributed to the laser energy that goes into burning down the foam microstructure. We compare our model against experimental data by simulating a 2 mg/cc SiO 2 foam shot performed at the Janus laser facility at the Lawrence Livermore National Laboratory. pF3D simulations with the foam model predict hot ion temperatures. This leads to a reduction in the level of stimulated Brillouin scattering (SBS), bringing the simulated level of SBS into agreement with the data. Intensity fluctuations at the foam front due to laser speckles and refraction result in ion temperature fluctuations when the foam

Who reads Laser propagation in a subcritical foam: Subgrid model?

Author

M. A. Belyaev; R. L. Berger; O. S. Jones; S. H. Langer; D. A. Mariscal; J. Milovich; B. Winjum

Publisher

American Institute of Physics; AIP Publishing (ISSN 1070-664X)

Published

2020

Language

EN

Field

Physics and Astronomy (Physical Sciences)