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Multiple beam two-plasmon decay: linear threshold to nonlinear saturation in three dimensions.

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Area of Science:

  • Plasma physics
  • Laser-plasma interactions
  • Nonlinear phenomena

Background:

  • Two-plasmon-decay instability is a key process in laser-plasma interactions.
  • Understanding instability thresholds is crucial for inertial confinement fusion.
  • The behavior of multiple laser beams is complex and requires detailed analysis.

Purpose of the Study:

  • To determine the linear stability of multiple coherent laser beams in inhomogeneous plasma.
  • To investigate the role of beam cooperation in two-plasmon-decay instability.
  • To analyze the nonlinear evolution of instabilities and their impact on shorter-wavelength modes.

Main Methods:

  • Linear stability analysis in three dimensions.
  • Investigation of cooperative effects between multiple laser beams.
  • Nonlinear calculations using a three-dimensional extended Zakharov model.

Main Results:

  • Cooperation between beams leads to absolute instability for long-wavelength decays.
  • Shorter-wavelength shared waves saturate convectively.
  • The multibeam configuration exhibits the lowest threshold for absolute instability in most cases.
  • Langmuir turbulence modifies convective saturation, leading to dominance of shorter-wavelength modes at late times.

Conclusions:

  • Multiple laser beams can exhibit complex instability dynamics.
  • Absolute instability, driven by beam cooperation, is a significant factor.
  • Turbulence plays a crucial role in the saturation and late-time evolution of instabilities.