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

Abstract

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:
Research Org.:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1416323
Alternate Identifier(s):
OSTI ID: 1405548
Report Number(s):
[2017-99; 1365]
[Journal ID: ISSN 1070-664X; 2017-99, 2321, 1365; TRN: US1800922]
Grant/Contract Number:  
[NA0001944]
Resource 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)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

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., 2017. 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. Mon . "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}
}

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