Molecular dynamics simulations of classical stopping power

Area of Science:

• Plasma physics
• Computational physics
• Statistical mechanics

Background:

• Classical kinetic theory provides a framework for understanding particle interactions.
• Plasma stopping power is crucial for various applications, including inertial confinement fusion and astrophysical plasmas.
• Accurate theoretical models are needed to describe energy loss in plasmas.

Purpose of the Study:

• To test classical kinetic theory using molecular dynamics simulations.
• To investigate the plasma stopping power of a classical electron gas.
• To compare simulation results with different kinetic theories and establish their regimes of validity.

Main Methods:

• Large-scale molecular dynamics (MD) simulations were performed with 10^4-10^6 particles.
• Simulations covered weak to moderately strong intratarget coupling regimes.
• Projectile charge and velocity were varied to alter projectile-target coupling.

Main Results:

• MD simulations provide accurate tests for classical kinetic theory.
• Comparisons were made with Boltzmann and Lenard-Balescu kinetic theories.
• Regimes of validity for different theories were established based on simulation data.

Conclusions:

• Molecular dynamics is a powerful tool for validating kinetic theories in plasma physics.
• The study provides improved stopping models that agree well with MD data.
• The findings offer a useful fit for understanding charged-particle stopping in classical electron gases.