Laser propagation in a subcritical foam: Subgrid model
Abstract
Here, 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 SiO2 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 burns down. These drive long-lived electron density fluctuationsmore »
- Authors:
-
[1];
[1];
[1];
[1];
[1];
[1];
[2]
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of California, Los Angeles, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
- OSTI Identifier:
- 1738902
- Alternate Identifier(s):
- OSTI ID: 1708960
- Report Number(s):
- LLNL-JRNL-812269
Journal ID: ISSN 1070-664X; 1018945; TRN: US2205386
- Grant/Contract Number:
- AC52-07NA27344; LDRD-17-ERD-118
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 11; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; energy equations; photoionization; plasma properties and parameters; plasma waves; laser plasma interactions; aerogel; light scattering
Citation Formats
Belyaev, M. A., Berger, R. L., Jones, O. S., Langer, S. H., Mariscal, D. A., Milovich, J., and Winjum, B. Laser propagation in a subcritical foam: Subgrid model. United States: N. p., 2020.
Web. doi:10.1063/5.0022952.
Belyaev, M. A., Berger, R. L., Jones, O. S., Langer, S. H., Mariscal, D. A., Milovich, J., & Winjum, B. Laser propagation in a subcritical foam: Subgrid model. United States. https://doi.org/10.1063/5.0022952
Belyaev, M. A., Berger, R. L., Jones, O. S., Langer, S. H., Mariscal, D. A., Milovich, J., and Winjum, B. Sun .
"Laser propagation in a subcritical foam: Subgrid model". United States. https://doi.org/10.1063/5.0022952. https://www.osti.gov/servlets/purl/1738902.
@article{osti_1738902,
title = {Laser propagation in a subcritical foam: Subgrid model},
author = {Belyaev, M. A. and Berger, R. L. and Jones, O. S. and Langer, S. H. and Mariscal, D. A. and Milovich, J. and Winjum, B.},
abstractNote = {Here, 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 SiO2 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 burns down. These drive long-lived electron density fluctuations on scales that are large compared to the pore size.},
doi = {10.1063/5.0022952},
journal = {Physics of Plasmas},
number = 11,
volume = 27,
place = {United States},
year = {Sun Nov 01 00:00:00 EDT 2020},
month = {Sun Nov 01 00:00:00 EDT 2020}
}
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