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Title: Simulations and measurements of hot-electron generation driven by the multibeam two-plasmon-decay instability

We report that multiple-beam experiments relevant to direct-drive inertial confinement fusion show the importance of nonlinear saturation mechanisms in the common-wave two-plasmon-decay (TPD) instability. Planar target experiments on the OMEGA laser used hard-x-ray measurements to study the influence of the linear common-wave growth rate on TPD driven hot-electron production in two drive beam configurations and over a range of overlapped laser intensities from 3.6 to 15.2 x 10 14 W/cm 2. The beam configuration with the larger linear common-wave growth rate had a lower intensity threshold for the onset of hot-electron production, but the linear growth rate did not have a significant impact on hot-electron production at high intensities. The experiments were modeled in 3-D using a hybrid code (LPSE) that combines a wave solver with a particle tracker to self-consistently calculate the electron velocity distribution and evolve electron Landau damping. Finally, good quantitative agreement was obtained between the simulated and measured hotel-electron distributions using a novel technique to account for macroscopic spatial and temporal variations that are present in the experiments.
Authors:
 [1] ;  [1] ; ORCiD logo [1] ; ORCiD logo [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [1]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Report Number(s):
2017-99; 1365
Journal ID: ISSN 1070-664X; 2017-99, 2321, 1365; TRN: US1800922
Grant/Contract Number:
NA0001944
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 10; 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:
1416323
Alternate Identifier(s):
OSTI ID: 1405548

Follett, R. K., Myatt, J. F., Shaw, J. G., Michel, D. T., Solodov, A. A., Edgell, D. H., Yaakobi, B., and Froula, D. H.. Simulations and measurements of hot-electron generation driven by the multibeam two-plasmon-decay instability. United States: N. p., Web. doi:10.1063/1.4998934.
Follett, R. K., Myatt, J. F., Shaw, J. G., Michel, D. T., Solodov, A. A., Edgell, D. H., Yaakobi, B., & Froula, D. H.. Simulations and measurements of hot-electron generation driven by the multibeam two-plasmon-decay instability. United States. doi:10.1063/1.4998934.
Follett, R. K., Myatt, J. F., Shaw, J. G., Michel, D. T., Solodov, A. A., Edgell, D. H., Yaakobi, B., and Froula, D. H.. 2017. "Simulations and measurements of hot-electron generation driven by the multibeam two-plasmon-decay instability". United States. doi:10.1063/1.4998934. https://www.osti.gov/servlets/purl/1416323.
@article{osti_1416323,
title = {Simulations and measurements of hot-electron generation driven by the multibeam two-plasmon-decay instability},
author = {Follett, R. K. and Myatt, J. F. and Shaw, J. G. and Michel, D. T. and Solodov, A. A. and Edgell, D. H. and Yaakobi, B. and Froula, D. H.},
abstractNote = {We report that multiple-beam experiments relevant to direct-drive inertial confinement fusion show the importance of nonlinear saturation mechanisms in the common-wave two-plasmon-decay (TPD) instability. Planar target experiments on the OMEGA laser used hard-x-ray measurements to study the influence of the linear common-wave growth rate on TPD driven hot-electron production in two drive beam configurations and over a range of overlapped laser intensities from 3.6 to 15.2 x 1014 W/cm2. The beam configuration with the larger linear common-wave growth rate had a lower intensity threshold for the onset of hot-electron production, but the linear growth rate did not have a significant impact on hot-electron production at high intensities. The experiments were modeled in 3-D using a hybrid code (LPSE) that combines a wave solver with a particle tracker to self-consistently calculate the electron velocity distribution and evolve electron Landau damping. Finally, good quantitative agreement was obtained between the simulated and measured hotel-electron distributions using a novel technique to account for macroscopic spatial and temporal variations that are present in the experiments.},
doi = {10.1063/1.4998934},
journal = {Physics of Plasmas},
number = 10,
volume = 24,
place = {United States},
year = {2017},
month = {10}
}