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Title: Implementing a microphysics model in hydrodynamic simulations to study the initial plasma formation in dielectric ablator materials for direct-drive implosions

Abstract

A microphysics model to describe the photoionization and impact ionization processes in dielectric ablator materials like plastic has been implemented into the 1-D hydrodynamic code LILAC for planar and spherical targets. Currently, the initial plasma formation during the early stages of a laser drive are modeled in an ad hoc manner, until the formation of a critical surface. Implementation of the physics-based models predict higher values of electron density, electron temperature, and pressure than the ad hoc model. Moreover, the numerical predictions are consistent with previous experimental observations of the shinethrough mechanism in plastic ablators. For planar targets, a decompression of the rear end of the target was observed, that is similar to recent experiments. An application of this model is to understand the laser-imprint mechanism that is caused by nonuniform laser irradiation due to single beam speckle.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2];  [1];  [1]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  2. Univ. of Bordeaux (France). Centre National de la Recherche Scientifique (CNRS) and Alternative Energies and Atomic Energy Commission (CEA)
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1633440
Report Number(s):
2019-304, 1570, 2526
Journal ID: ISSN 2470-0045; PLEEE8; 2019-304, 1570, 2526
Grant/Contract Number:  
NA0003856
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 101; Journal Issue: 6; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Kar, Arnab, Hu, S. X., Duchateau, G., Carroll-Nellenback, J., and Radha, P. B. Implementing a microphysics model in hydrodynamic simulations to study the initial plasma formation in dielectric ablator materials for direct-drive implosions. United States: N. p., 2020. Web. doi:10.1103/PhysRevE.101.063202.
Kar, Arnab, Hu, S. X., Duchateau, G., Carroll-Nellenback, J., & Radha, P. B. Implementing a microphysics model in hydrodynamic simulations to study the initial plasma formation in dielectric ablator materials for direct-drive implosions. United States. doi:https://doi.org/10.1103/PhysRevE.101.063202
Kar, Arnab, Hu, S. X., Duchateau, G., Carroll-Nellenback, J., and Radha, P. B. Mon . "Implementing a microphysics model in hydrodynamic simulations to study the initial plasma formation in dielectric ablator materials for direct-drive implosions". United States. doi:https://doi.org/10.1103/PhysRevE.101.063202.
@article{osti_1633440,
title = {Implementing a microphysics model in hydrodynamic simulations to study the initial plasma formation in dielectric ablator materials for direct-drive implosions},
author = {Kar, Arnab and Hu, S. X. and Duchateau, G. and Carroll-Nellenback, J. and Radha, P. B.},
abstractNote = {A microphysics model to describe the photoionization and impact ionization processes in dielectric ablator materials like plastic has been implemented into the 1-D hydrodynamic code LILAC for planar and spherical targets. Currently, the initial plasma formation during the early stages of a laser drive are modeled in an ad hoc manner, until the formation of a critical surface. Implementation of the physics-based models predict higher values of electron density, electron temperature, and pressure than the ad hoc model. Moreover, the numerical predictions are consistent with previous experimental observations of the shinethrough mechanism in plastic ablators. For planar targets, a decompression of the rear end of the target was observed, that is similar to recent experiments. An application of this model is to understand the laser-imprint mechanism that is caused by nonuniform laser irradiation due to single beam speckle.},
doi = {10.1103/PhysRevE.101.063202},
journal = {Physical Review E},
number = 6,
volume = 101,
place = {United States},
year = {2020},
month = {6}
}

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