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Cross-Beam Energy Transfer Saturation by Ion Heating.

A M Hansen1,2, K L Nguyen1,2,3, D Turnbull1

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

Physical Review Letters
|March 5, 2021
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Summary
This summary is machine-generated.

Cross-beam energy transfer (CBET) saturates due to ion heating in plasma. Ion temperature increased sevenfold during intense laser interactions, consistent with simulations and linear models.

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Area of Science:

  • Plasma physics
  • Laser-plasma interactions
  • High-energy-density physics

Background:

  • Cross-beam energy transfer (CBET) is crucial in laser-driven inertial confinement fusion.
  • Understanding CBET saturation mechanisms is essential for optimizing laser energy coupling.

Purpose of the Study:

  • To investigate the saturation of CBET by ion heating in a gas-jet plasma.
  • To characterize the plasma conditions and ion dynamics during saturation.

Main Methods:

  • Utilized a wavelength-tunable ultraviolet (UV) probe laser interacting with four intense UV pump beams.
  • Employed Thomson scattering for plasma characterization.
  • Performed particle-in-cell (PIC) simulations.

Main Results:

  • Observed saturation of CBET at high laser intensities, indicated by reduced power transfer to the probe beam.
  • Measured a sevenfold increase in ion temperature during the 500-picosecond interaction.
  • PIC simulations confirmed ion trapping and heating consistent with experimental data.

Conclusions:

  • Ion heating is a primary mechanism for CBET saturation in this plasma regime.
  • Linear kinetic CBET models accurately predict energy transfer when using measured plasma conditions.