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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
Summary
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.
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.
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