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Title: Ray-based modeling of cross-beam energy transfer at caustics

Abstract

Cross-beam energy transfer (CBET) is a laser-plasma instability that significantly impacts laser energy deposition in laser-driven inertial confinement fusion (ICF) experiments. Radiation-hydrodynamics simulations, which are used to design and tune ICF implosions, use ray-based CBET models, but existing models require artificial multipliers to conserve energy and to obtain quantitative agreement with experiments. The discretization of the ray trajectories in traditional ray-based CBET models does not account for the rapid variation in CBET gain as rays pass through caustics. In this study, we introduce a new model that allows one to treat caustics much more accurately and greatly improves energy conservation. The ray-based CBET calculations show excellent agreement with laser absorption from 2-D wave-based calculations (0.3% difference) and a 3-D 60-beam OMEGA implosion (2.4% difference) without artificial multipliers.

Authors:
 [1];  [1];  [2];  [1];  [1];  [1];  [1]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  2. Univ. of Alberta, Edmonton, AB (Canada). Department of Electrical and Computer Engineering
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1477231
Alternate Identifier(s):
OSTI ID: 1477526
Report Number(s):
2018-109, 1443
Journal ID: ISSN 2470-0045; PLEEE8; 2018-109, 1443, 2401
Grant/Contract Number:  
NA0001944
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 98; Journal Issue: 4; 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

Follett, R. K., Shaw, J. G., Myatt, J. F., Goncharov, V. N., Edgell, D. H., Froula, D. H., and Palastro, J. P. Ray-based modeling of cross-beam energy transfer at caustics. United States: N. p., 2018. Web. doi:10.1103/PhysRevE.98.043202.
Follett, R. K., Shaw, J. G., Myatt, J. F., Goncharov, V. N., Edgell, D. H., Froula, D. H., & Palastro, J. P. Ray-based modeling of cross-beam energy transfer at caustics. United States. doi:10.1103/PhysRevE.98.043202.
Follett, R. K., Shaw, J. G., Myatt, J. F., Goncharov, V. N., Edgell, D. H., Froula, D. H., and Palastro, J. P. Tue . "Ray-based modeling of cross-beam energy transfer at caustics". United States. doi:10.1103/PhysRevE.98.043202. https://www.osti.gov/servlets/purl/1477231.
@article{osti_1477231,
title = {Ray-based modeling of cross-beam energy transfer at caustics},
author = {Follett, R. K. and Shaw, J. G. and Myatt, J. F. and Goncharov, V. N. and Edgell, D. H. and Froula, D. H. and Palastro, J. P.},
abstractNote = {Cross-beam energy transfer (CBET) is a laser-plasma instability that significantly impacts laser energy deposition in laser-driven inertial confinement fusion (ICF) experiments. Radiation-hydrodynamics simulations, which are used to design and tune ICF implosions, use ray-based CBET models, but existing models require artificial multipliers to conserve energy and to obtain quantitative agreement with experiments. The discretization of the ray trajectories in traditional ray-based CBET models does not account for the rapid variation in CBET gain as rays pass through caustics. In this study, we introduce a new model that allows one to treat caustics much more accurately and greatly improves energy conservation. The ray-based CBET calculations show excellent agreement with laser absorption from 2-D wave-based calculations (0.3% difference) and a 3-D 60-beam OMEGA implosion (2.4% difference) without artificial multipliers.},
doi = {10.1103/PhysRevE.98.043202},
journal = {Physical Review E},
number = 4,
volume = 98,
place = {United States},
year = {2018},
month = {10}
}

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Cited by: 4 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Ray- and (b) wave-based simulations of the magnitude of the enveloped electric fields for two beams (injected from the bottom and left) interacting in an azimuthally symmetric plasma. The critical surface is indicated by a white dashed line. (c) Lineouts of the fields from $LPSE$ (solid bluemore » curve) and rays (red dashed curve). The location of the caustic is denoted by a vertical dashed black line.« less

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Works referenced in this record:

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