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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
Published on: August 1, 2017
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Pump depletion and the Raman gap in ignition-scale plasmas
S H Cao1,2, M J Rosenberg2, A A Solodov2
1Department of Mechanical Engineering, <a href="https://ror.org/022kthw22">University of Rochester</a>, Rochester, New York 14627, USA.
Physical Review. E
|November 20, 2024
Summary
Simulations of laser-plasma instabilities in inertial confinement fusion show that stimulated Raman side-scattering depletes laser energy and creates spectral gaps, matching experimental observations.
Area of Science:
- Plasma Physics
- Fusion Energy
- Computational Physics
Background:
- Laser-plasma instabilities are critical challenges in achieving inertial confinement fusion (ICF).
- Understanding these instabilities is essential for efficient direct-drive ICF designs.
Purpose of the Study:
- To investigate laser-plasma instabilities under direct-drive ICF ignition conditions.
- To analyze the effects of combined in-plane (PP) and out-of-the-plane (SP) lasers on these instabilities.
Main Methods:
- Utilizing two-dimensional particle-in-cell (PIC) simulations.
- Employing a combination of PP and SP laser configurations.
Main Results:
- Stimulated Raman side-scattering (SRS) was identified as a significant instability.
- SRS was shown to cause substantial pump depletion, reducing laser energy available for fusion.
- A characteristic gap was observed in the Raman scattered-light spectra, consistent with experimental findings.
Conclusions:
- The simulation results validate the role of SRS in pump depletion and spectral gap formation.
- These findings provide insights into controlling laser-plasma interactions for successful ICF.
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