Positivity-Preserving Semi-Lagrangian Discontinuous Galerkin Methods for Multi-Species Vlasov-Ampère Models of Plasma

This paper develops a high-order, positivity-preserving kinetic solver for the multi-species Vlasov-Ampère system using a semi-Lagrangian discontinuous Galerkin framework. The method discretizes phase space with high-order discontinuous Galerkin finite elements and is designed for stiff, multi-scale plasma regimes, including strong ion-electron scale separation.