Speaker
Description
Plasmas inherently exhibit multiscale dynamics, and full kinetic models are crucial for understanding these complex processes. Explicit kinetic schemes are easy to implement but demand time steps finely resolved to the plasma period and may suffer from numerical heating, while implicit schemes ensure stability but involve costly nonlinear solvers. Semi-implicit methods provide a practical balance between efficiency and stability. In particular, ECsim pioneered an energy-conserving semi-implicit PIC framework, yet developing efficient and unconditionally stable grid-based schemes with strict energy conservation remains challenging. In this talk, I will present an inherently noise-free energy-conserving semi-Lagrangian (ECSL) scheme that combines the efficiency of explicit methods with the stability of implicit ones. Numerical results confirm its accuracy, efficiency, and exact energy conservation, demonstrating ECSL as a promising tool for multiscale plasma simulations.