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

Follett, R. K.; Shaw, J. G.; Myatt, J. F.; Goncharov, V. N.; Edgell, D. H.; Froula, D. H.; Palastro, J. P.

doi:10.1103/PhysRevE.98.043202

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

Journal Article · Tue Oct 09 00:00:00 EDT 2018 · Physical Review E

DOI:https://doi.org/10.1103/PhysRevE.98.043202· OSTI ID:1477231

Follett, R. K. ^[1]; Shaw, J. G. ^[1]; Myatt, J. F. ^[2]; Goncharov, V. N. ^[1]; Edgell, D. H. ^[1]; Froula, D. H. ^[1]; Palastro, J. P. ^[1]

Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Univ. of Alberta, Edmonton, AB (Canada). Department of Electrical and Computer Engineering

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.

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Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0001944

OSTI ID:: 1477231

Alternate ID(s):: OSTI ID: 1477526

Report Number(s):: 2018-109, 1443; PLEEE8; 2018-109, 1443, 2401

Journal Information:: Physical Review E, Vol. 98, Issue 4; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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Cited By (3)

Resonance absorption of a broadband laser pulse Palastro, J. P.; Shaw, J. G.; Follett, R. K. Physics of Plasmas, Vol. 25, Issue 12 https://doi.org/10.1063/1.5063589	journal	December 2018
Adaptive inverse ray-tracing for accurate and efficient modeling of cross beam energy transfer in hydrodynamics simulations Colaïtis, A.; Follett, R. K.; Palastro, J. P. Physics of Plasmas, Vol. 26, Issue 7 https://doi.org/10.1063/1.5108777	journal	July 2019
A unified modeling of wave mixing processes with the ray tracing method Debayle, A.; Ruyer, C.; Morice, O. Physics of Plasmas, Vol. 26, Issue 9 https://doi.org/10.1063/1.5110247	journal	September 2019