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Title: A wave-based model for cross-beam energy transfer in direct-drive inertial confinement fusion

Cross-beam energy transfer (CBET) is thought to be responsible for a 30% reduction in hydrodynamic coupling efficiency on OMEGA and up to 50% at the ignition scale for direct-drive (DD) implosions. These numbers are determined by ray-based models that have been developed and integrated within the radiation–hydrodynamics codes LILAC (1-D) and DRACO (2-D). However, ray-based modeling of CBET in an inhomogeneous plasma assumes a steady-state plasma response, does not include the effects of beam speckle, and treats ray caustics in an ad hoc manner. The validity of the modeling for ignition-scale implosions has not yet been determined. To address the physics shortcomings, which have important implications for DD inertial confinement fusion, a new wave-based model has been developed. It solves the time-enveloped Maxwell equations in three dimensions, including polarization effects, plasma inhomogeneity, and open-boundary conditions with the ability to prescribe beams incident at arbitrary angles. Beams can be made realistic with respect to laser speckle, polarization smoothing, and laser bandwidth. This, coupled to a linearized low-frequency plasma response that does not assume a steady state, represents the most-complete model of CBET to date.
Authors:
 [1] ;  [2] ; ORCiD logo [2] ;  [2] ; ORCiD logo [3] ;  [2] ;  [1]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics, and Dept. of Mechanical Engineering
  2. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  3. Univ. of Rochester, NY (United States). Lab. for Laser Energetics, and Dept. of Physics and Astronomy
Publication Date:
Grant/Contract Number:
NA0001944; AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
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:
1465762
Alternate Identifier(s):
OSTI ID: 1361848

Myatt, J. F., Follett, R. K., Shaw, J. G., Edgell, D. H., Froula, D. H., Igumenshchev, I. V., and Goncharov, V. N.. A wave-based model for cross-beam energy transfer in direct-drive inertial confinement fusion. United States: N. p., Web. doi:10.1063/1.4982059.
Myatt, J. F., Follett, R. K., Shaw, J. G., Edgell, D. H., Froula, D. H., Igumenshchev, I. V., & Goncharov, V. N.. A wave-based model for cross-beam energy transfer in direct-drive inertial confinement fusion. United States. doi:10.1063/1.4982059.
Myatt, J. F., Follett, R. K., Shaw, J. G., Edgell, D. H., Froula, D. H., Igumenshchev, I. V., and Goncharov, V. N.. 2017. "A wave-based model for cross-beam energy transfer in direct-drive inertial confinement fusion". United States. doi:10.1063/1.4982059. https://www.osti.gov/servlets/purl/1465762.
@article{osti_1465762,
title = {A wave-based model for cross-beam energy transfer in direct-drive inertial confinement fusion},
author = {Myatt, J. F. and Follett, R. K. and Shaw, J. G. and Edgell, D. H. and Froula, D. H. and Igumenshchev, I. V. and Goncharov, V. N.},
abstractNote = {Cross-beam energy transfer (CBET) is thought to be responsible for a 30% reduction in hydrodynamic coupling efficiency on OMEGA and up to 50% at the ignition scale for direct-drive (DD) implosions. These numbers are determined by ray-based models that have been developed and integrated within the radiation–hydrodynamics codes LILAC (1-D) and DRACO (2-D). However, ray-based modeling of CBET in an inhomogeneous plasma assumes a steady-state plasma response, does not include the effects of beam speckle, and treats ray caustics in an ad hoc manner. The validity of the modeling for ignition-scale implosions has not yet been determined. To address the physics shortcomings, which have important implications for DD inertial confinement fusion, a new wave-based model has been developed. It solves the time-enveloped Maxwell equations in three dimensions, including polarization effects, plasma inhomogeneity, and open-boundary conditions with the ability to prescribe beams incident at arbitrary angles. Beams can be made realistic with respect to laser speckle, polarization smoothing, and laser bandwidth. This, coupled to a linearized low-frequency plasma response that does not assume a steady state, represents the most-complete model of CBET to date.},
doi = {10.1063/1.4982059},
journal = {Physics of Plasmas},
number = 5,
volume = 24,
place = {United States},
year = {2017},
month = {4}
}

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