Ablation pressure driven by an energetic electron beam in a dense plasma

Area of Science:

• Plasma Physics
• High-Energy-Density Physics
• Materials Science

Background:

• Energetic electron beams can induce extreme pressures in solid materials.
• Understanding ablation pressure and shock wave propagation is key for fusion energy research.
• Fast electron energy transfer is a potential mechanism for creating ignition shock waves.

Purpose of the Study:

• To develop an analytical model for ablation pressure and shock wave propagation driven by energetic electron beams.
• To validate the model using numerical simulations.
• To assess the application of this mechanism in the shock-ignition approach for inertial confinement fusion.

Main Methods:

• Development of an analytical model for ablation pressure and shock wave dynamics.
• Numerical simulations to confirm the analytical model's predictions.
• Analysis of energy transfer from fast electrons to solid-density materials.

Main Results:

• The analytical model accurately describes pressure formation and shock wave propagation.
• Simulations confirm the model's predictions for electron beam-driven processes.
• A 30 keV electron beam with 2-5 PW/cm² flux can generate >300 Mbar pressure for 200-300 ps.

Conclusions:

• Energetic electron beams are a viable method for generating ultra-high pressures in solids.
• The developed model provides a tool for understanding and optimizing such processes.
• This mechanism shows promise for creating the igniting shock wave in inertial confinement fusion.