Plasma slab expansion into vacuum

TL;DR

This paper presents a hydrodynamic model for collisionless plasma slab expansion into vacuum, demonstrating that a dispersionless approximation accurately describes the process and aligns well with numerical solutions.

Contribution

It introduces a two-temperature hydrodynamic approach using the Riemann method for plasma expansion, providing a simple yet accurate analytical solution.

Findings

Dispersionless approximation matches numerical solutions well.

Analytical solution effectively describes plasma dynamics.

Model simplifies understanding of plasma expansion processes.

Abstract

The problem of collisionless plasma slab expansion into vacuum is solved within a two-temperature hydrodynamic approximation in the dispersionless limit of zero Debye radius. In the framework of such an approach, the solution by the Riemann method provides quite accurate description of the whole process of plasma dynamics. It is shown that the dispersionless approximation agrees very well with exact numerical solution of the full system of plasma hydrodynamic equations.