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

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:
Report Number(s):
2018-109, 1443
Journal ID: ISSN 2470-0045; PLEEE8; 2018-109, 1443, 2401
Grant/Contract Number:
NA0001944
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)
Research Org:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1477231
Alternate Identifier(s):
OSTI ID: 1477526

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., 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.. 2018. "Ray-based modeling of cross-beam energy transfer at caustics". United States. doi:10.1103/PhysRevE.98.043202.
@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}
}

Works referenced in this record:

Crossed-beam energy transfer in direct-drive implosions
journal, May 2012
  • Igumenshchev, I. V.; Seka, W.; Edgell, D. H.
  • Physics of Plasmas, Vol. 19, Issue 5, Article No. 056314
  • DOI: 10.1063/1.4718594