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Title: A tesselation-based model for intensity estimation and laser plasma interactions calculations in three dimensions

Here, a three-dimensional laser propagation model for computation of laser-plasma interactions is presented. It is focused on indirect drive geometries in inertial confinement fusion and formulated for use at large temporal and spatial scales. A modified tesselation-based estimator and a relaxation scheme are used to estimate the intensity distribution in plasma from geometrical optics rays. Comparisons with reference solutions show that this approach is well-suited to reproduce realistic 3D intensity field distributions of beams smoothed by phase plates. It is shown that the method requires a reduced number of rays compared to traditional rigid-scale intensity estimation. Using this field estimator, we have implemented laser refraction, inverse-bremsstrahlung absorption, and steady-state crossed-beam energy transfer with a linear kinetic model in the numerical code VAMPIRE. Probe beam amplification and laser spot shapes are compared with experimental results and pf3d paraxial simulations. These results are promising for the efficient and accurate computation of laser intensity distributions in holhraums, which is of importance for determining the capsule implosion shape and risks of laser-plasma instabilities such as hot electron generation and backscatter in multi-beam configurations.
Authors:
 [1] ;  [2] ; ORCiD logo [2] ;  [2] ;  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-756307
Journal ID: ISSN 1070-664X; 943612
Grant/Contract Number:
AC52-07NA27344; AC52- 07NA27344
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 3; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; kinetic theory; energy conservation; plasma confinement; partial differential equations; Euclidean geometries; Bremsstrahlung; lasers; Voronoi diagrams; geometrical optics; laser plasma interactions
OSTI Identifier:
1469462
Alternate Identifier(s):
OSTI ID: 1429577

Colaïtis, A., Chapman, T., Strozzi, D., Divol, L., and Michel, P.. A tesselation-based model for intensity estimation and laser plasma interactions calculations in three dimensions. United States: N. p., Web. doi:10.1063/1.5020385.
Colaïtis, A., Chapman, T., Strozzi, D., Divol, L., & Michel, P.. A tesselation-based model for intensity estimation and laser plasma interactions calculations in three dimensions. United States. doi:10.1063/1.5020385.
Colaïtis, A., Chapman, T., Strozzi, D., Divol, L., and Michel, P.. 2018. "A tesselation-based model for intensity estimation and laser plasma interactions calculations in three dimensions". United States. doi:10.1063/1.5020385.
@article{osti_1469462,
title = {A tesselation-based model for intensity estimation and laser plasma interactions calculations in three dimensions},
author = {Colaïtis, A. and Chapman, T. and Strozzi, D. and Divol, L. and Michel, P.},
abstractNote = {Here, a three-dimensional laser propagation model for computation of laser-plasma interactions is presented. It is focused on indirect drive geometries in inertial confinement fusion and formulated for use at large temporal and spatial scales. A modified tesselation-based estimator and a relaxation scheme are used to estimate the intensity distribution in plasma from geometrical optics rays. Comparisons with reference solutions show that this approach is well-suited to reproduce realistic 3D intensity field distributions of beams smoothed by phase plates. It is shown that the method requires a reduced number of rays compared to traditional rigid-scale intensity estimation. Using this field estimator, we have implemented laser refraction, inverse-bremsstrahlung absorption, and steady-state crossed-beam energy transfer with a linear kinetic model in the numerical code VAMPIRE. Probe beam amplification and laser spot shapes are compared with experimental results and pf3d paraxial simulations. These results are promising for the efficient and accurate computation of laser intensity distributions in holhraums, which is of importance for determining the capsule implosion shape and risks of laser-plasma instabilities such as hot electron generation and backscatter in multi-beam configurations.},
doi = {10.1063/1.5020385},
journal = {Physics of Plasmas},
number = 3,
volume = 25,
place = {United States},
year = {2018},
month = {3}
}