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Title: Time-dependent saturation and physics-based nonlinear model of cross-beam energy transfer

Abstract

The nonlinear physics of cross-beam energy transfer (CBET) for multi-speckled laser beams is examined using large-scale particle-in-cell simulations for a range of laser and plasma conditions relevant to indirect-drive inertial confinement fusion (ICF) experiments. The time-dependent growth and saturation of CBET involve complex, nonlinear ion and electron dynamics, including ion trapping-induced enhancement and detuning, ion acoustic wave (IAW) nonlinearity, oblique forward stimulated Raman scattering (FSRS), and backward stimulated Brillouin scattering (BSBS) in a CBET-amplified seed beam. Ion-trapping-induced detuning of CBET is captured in the kinetic linear response by a new δf-Gaussian-mixture algorithm, enabling an accurate characterization of trapping-induced non-Maxwellian distributions. Ion trapping induces nonlinear processes, such as changes to the IAW dispersion and nonlinearities (e.g., bowing and self-focusing), which, together with pump depletion, FSRS, and BSBS, determine the time-dependent nature and level of CBET gain as the system approaches a steady state. Using VPIC simulations at intensities at and above the onset threshold for ion trapping and the insight from the time-dependent saturation analyses, we construct a nonlinear CBET model from local laser and plasma conditions that predicts the CBET gain and the energy deposition into the plasma. This model is intended to provide a more accurate, physics-based description ofmore » CBET saturation over a wide range of conditions encountered in ICF hohlraums compared with linear CBET gain models with ad hoc saturation clamps often used in laser ray-based methods in multi-physics codes.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
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  1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1970297
Alternate Identifier(s):
OSTI ID: 1968528
Report Number(s):
LA-UR-22-31845
Journal ID: ISSN 1070-664X; TRN: US2313496
Grant/Contract Number:  
89233218CNA000001; 20210063DR
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 30; Journal Issue: 4; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Yin, Lin, Nguyen, Truong Ba, Chen, Guangye, Chacon, Luis, Stark, David James, Green, Lauren Maranne, and Haines, Brian Michael. Time-dependent saturation and physics-based nonlinear model of cross-beam energy transfer. United States: N. p., 2023. Web. doi:10.1063/5.0134867.
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Yin, Lin, Nguyen, Truong Ba, Chen, Guangye, Chacon, Luis, Stark, David James, Green, Lauren Maranne, & Haines, Brian Michael. Time-dependent saturation and physics-based nonlinear model of cross-beam energy transfer. United States. https://doi.org/10.1063/5.0134867
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Yin, Lin, Nguyen, Truong Ba, Chen, Guangye, Chacon, Luis, Stark, David James, Green, Lauren Maranne, and Haines, Brian Michael. Wed . "Time-dependent saturation and physics-based nonlinear model of cross-beam energy transfer". United States. https://doi.org/10.1063/5.0134867. https://www.osti.gov/servlets/purl/1970297.
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@article{osti_1970297,
title = {Time-dependent saturation and physics-based nonlinear model of cross-beam energy transfer},
author = {Yin, Lin and Nguyen, Truong Ba and Chen, Guangye and Chacon, Luis and Stark, David James and Green, Lauren Maranne and Haines, Brian Michael},
abstractNote = {The nonlinear physics of cross-beam energy transfer (CBET) for multi-speckled laser beams is examined using large-scale particle-in-cell simulations for a range of laser and plasma conditions relevant to indirect-drive inertial confinement fusion (ICF) experiments. The time-dependent growth and saturation of CBET involve complex, nonlinear ion and electron dynamics, including ion trapping-induced enhancement and detuning, ion acoustic wave (IAW) nonlinearity, oblique forward stimulated Raman scattering (FSRS), and backward stimulated Brillouin scattering (BSBS) in a CBET-amplified seed beam. Ion-trapping-induced detuning of CBET is captured in the kinetic linear response by a new δf-Gaussian-mixture algorithm, enabling an accurate characterization of trapping-induced non-Maxwellian distributions. Ion trapping induces nonlinear processes, such as changes to the IAW dispersion and nonlinearities (e.g., bowing and self-focusing), which, together with pump depletion, FSRS, and BSBS, determine the time-dependent nature and level of CBET gain as the system approaches a steady state. Using VPIC simulations at intensities at and above the onset threshold for ion trapping and the insight from the time-dependent saturation analyses, we construct a nonlinear CBET model from local laser and plasma conditions that predicts the CBET gain and the energy deposition into the plasma. This model is intended to provide a more accurate, physics-based description of CBET saturation over a wide range of conditions encountered in ICF hohlraums compared with linear CBET gain models with ad hoc saturation clamps often used in laser ray-based methods in multi-physics codes.},
doi = {10.1063/5.0134867},
journal = {Physics of Plasmas},
number = 4,
volume = 30,
place = {United States},
year = {Wed Apr 05 00:00:00 EDT 2023},
month = {Wed Apr 05 00:00:00 EDT 2023}
}
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