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Experimental validation of the two-plasmon-decay common-wave process.

D T Michel1, A V Maximov, R W Short

  • 1Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14636, USA. tmic@lle.rochester.edu

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Hot electron energy from two plasmon decay instability is consistent with one or two laser beams but decreases with four. This occurs because multiple beams share a common electron-plasma wave, reducing energy transfer.

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Area of Science:

  • Plasma physics
  • Laser-plasma interactions

Background:

  • The two plasmon decay (TPD) instability is a key process in laser-plasma interactions, generating hot electrons.
  • Understanding TPD is crucial for inertial confinement fusion energy research.

Purpose of the Study:

  • To investigate the effect of multiple laser beams on hot electron generation via TPD.
  • To compare electron energy yields driven by one, two, and four laser beams.

Main Methods:

  • Experiments were conducted on the OMEGA EP laser facility using planar targets.
  • Hot electron energy was measured for different laser beam configurations (one, two, and four beams) at constant overlapped intensity.
  • A theoretical model was developed to explain the observed experimental results.

Main Results:

  • Hot electron energy was similar for one and two laser beams.
  • A significant reduction in hot electron energy was observed with four laser beams.
  • The model confirmed that multiple beams drive a common electron-plasma wave, with gain proportional to overlapped intensity.

Conclusions:

  • The number of laser beams significantly impacts hot electron generation through TPD.
  • Beam overlap and shared electron-plasma waves are critical factors in energy deposition and hot electron production.
  • Findings provide insights into optimizing laser-plasma coupling for fusion applications.