Numerical study of the transverse diffusion coefficient for a one component model of plasma

Area of Science:

• Plasma Physics
• Condensed Matter Physics
• Statistical Mechanics

Background:

• Magnetized plasmas are crucial in astrophysics and fusion energy research.
• Understanding particle diffusion in magnetized plasmas is key to predicting their behavior.
• Molecular dynamics simulations offer a powerful tool to study microscopic plasma properties.

Purpose of the Study:

• To estimate the diffusion coefficient (D⊥) in the plane orthogonal to magnetic field lines for a magnetized one-component plasma.
• To investigate the dependence of diffusion on magnetic field strength.
• To explore the underlying microscopic dynamics responsible for observed diffusion behaviors.

Main Methods:

• Performing molecular dynamics simulations of a magnetized one-component plasma.
• Analyzing the diffusion coefficient (D⊥) as a function of magnetic field strength (|B→|).
• Examining velocity autocorrelation functions to understand microscopic dynamics and mixing properties.

Main Results:

• A threshold in magnetic field strength (|B→|) was identified, influencing diffusion behavior.
• For weak magnetic fields, diffusion coefficients scale as 1/|B→|².
• At high magnetic field strengths, a slower decay of diffusion coefficients was observed.

Conclusions:

• The diffusion of particles in a magnetized plasma is strongly dependent on magnetic field strength.
• A transition in diffusion scaling occurs, linked to changes in microscopic dynamics.
• Further investigation into velocity autocorrelation provides insights into the mixing properties governing this transition.