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Multibeam absolute stimulated Raman scattering and two-plasmon decay.

R K Follett1, J G Shaw1, J F Myatt2

  • 1Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester New York 14623, USA.

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|May 20, 2020
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Summary
This summary is machine-generated.

Multibeam effects significantly impact stimulated Raman scattering (SRS) and two-plasmon decay (TPD) instabilities in fusion plasmas. Two-plasmon decay shows stronger multibeam coupling than SRS, explaining observed experimental regimes.

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Area of Science:

  • Plasma Physics
  • Fusion Energy
  • Laser-Plasma Interactions

Background:

  • Inertial confinement fusion (ICF) relies on understanding laser-plasma instabilities.
  • Stimulated Raman scattering (SRS) and two-plasmon decay (TPD) are key instabilities affecting ICF performance.
  • Previous studies often focused on single-beam interactions, neglecting multibeam effects.

Purpose of the Study:

  • To calculate three-dimensional absolute instability thresholds for SRS and TPD.
  • To compare multibeam coupling efficiencies for SRS and TPD.
  • To explain observed experimental regimes on OMEGA and NIF based on instability behavior.

Main Methods:

  • Three-dimensional numerical calculations of instability thresholds.
  • Analysis of plasma conditions relevant to OMEGA and NIF direct-drive ICF experiments.
  • Comparison of single-beam and multibeam instability thresholds.

Main Results:

  • Multibeam effects are significant for both SRS and TPD.
  • SRS exhibits less efficient multibeam coupling compared to TPD.
  • The minimum instability threshold for NIF parameters occurs for SRS near quarter-critical density.

Conclusions:

  • The findings align with experimental observations of TPD-dominated regimes on OMEGA and SRS-dominated regimes on NIF.
  • Despite lower single-beam SRS thresholds, multibeam coupling influences the dominant instability.
  • Understanding these multibeam effects is crucial for optimizing ICF performance.