Boltzmann-Fokker-Planck Kinetic Solver with Adaptive Mesh in Phase Space

TL;DR

This paper presents a kinetic solver in 1d2v phase space with adaptive Cartesian mesh and spherical velocity coordinates, enabling efficient simulation of plasma processes including collisions and runaway electrons.

Contribution

The paper introduces a novel kinetic solver with adaptive mesh and spherical coordinates, improving efficiency and accuracy in plasma simulations involving complex collisional phenomena.

Findings

Successfully implemented adaptive mesh in phase space for kinetic equations.

Demonstrated capabilities in modeling electron scattering, acceleration, and ionization.

Reduced computational cost using a two-stream approach for runaway electron studies.

Abstract

We describe the implementation of kinetic solvers in 1d2v phase space using adaptive Cartesian mesh. Spherical coordinates in velocity space are used to simplify the Lorentz and Fokker-Planck collisional operators. The key capabilities of the new solvers are illustrated for electron elastic scattering, acceleration, continuous energy loss in collisions, and ionization processes in weakly-ionized plasma. We have also implemented two-stream approach to reduce computational cost for studies of gas breakdown dynamics in the presence of runaway electrons. The benefits and limitations of the non-split-phase-space method for kinetic solvers with adaptive mesh in phase space are discussed.