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Area of Science:

  • Plasma Physics
  • Laser-Plasma Interactions
  • Inertial Confinement Fusion

Background:

  • The two-plasmon decay (TPD) instability is a key process in laser-plasma interactions relevant to inertial confinement fusion.
  • Understanding TPD is crucial for predicting and controlling energy absorption and electron heating in implosion experiments.

Purpose of the Study:

  • To investigate the spatial characteristics and effects of the two-plasmon decay (TPD) instability during directly driven implosions.
  • To determine the electron temperature in the corona and compare it with hydrodynamic predictions.

Main Methods:

  • Analysis of half-harmonic emission spectra and imaging during directly driven implosions.
  • Utilizing a prominent spectral feature to measure electron temperature.
  • Comparison with one-dimensional and two-dimensional hydrodynamic simulations.

Main Results:

  • TPD instability is driven nonuniformly across the target surface, with multibeam effects being dominant.
  • TPD exhibits a spatially limited extent, forming distinct temperature islands.
  • Measured electron temperatures exceed one-dimensional hydrodynamic predictions by approximately 10% above the TPD threshold.
  • Two-dimensional simulations suggest TPD instability locally absorbs about 20% of laser intensity.

Conclusions:

  • Multibeam effects and nonuniform drive significantly influence TPD instability in implosions.
  • TPD is responsible for localized heating, creating temperature islands that require substantial laser energy absorption.
  • Discrepancies between experimental temperatures and 1D predictions highlight the importance of 2D effects and TPD absorption.