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Anomalous Absorption by the Two-Plasmon Decay Instability.

D Turnbull1, A V Maximov1, D H Edgell1

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

Physical Review Letters
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This summary is machine-generated.

Simulations of laser-driven fusion experiments show accurate absorption at low intensity. At higher intensities, the two-plasmon decay instability causes anomalous absorption, significantly increasing energy uptake on target.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Laser-plasma interactions

Background:

  • Radiation-hydrodynamic simulations accurately predict laser absorption in fusion experiments at low intensities.
  • Discrepancies arise at higher intensities, with unexpectedly high laser absorption observed.

Purpose of the Study:

  • Investigate the cause of anomalous laser absorption in directly driven fusion experiments at increased laser intensities.
  • Determine the role of the two-plasmon decay (TPD) instability in anomalous absorption.

Main Methods:

  • Utilized radiation-hydrodynamic simulations of fusion experiments at the Omega Laser Facility.
  • Analyzed signatures of the two-plasmon decay instability, including half-harmonic and hard-x-ray emission.
  • Correlated scattered light data with TPD signatures and laser intensity.
  • Developed and validated an empirical scaling of absorption versus the TPD threshold parameter using simulation codes.

Main Results:

  • TPD instability strongly correlates with anomalous laser absorption at higher intensities.
  • Up to approximately 30% of laser power reaching quarter-critical density can be absorbed locally when the TPD threshold is exceeded.
  • An empirical scaling of absorption versus the TPD threshold parameter was determined.

Conclusions:

  • The two-plasmon decay instability is identified as the primary driver of anomalous laser absorption in these fusion experiments.
  • Understanding and mitigating TPD is crucial for optimizing laser energy coupling in inertial confinement fusion.