Speaker
Description
Electron and ion transport in non-equilibrium plasmas is inherently complex, exhibiting intricate behaviour in the phase space and in time. The Particle-In-Cell (PIC) method is widely used, being close to first principles and requiring few input parameters, enabling self-consistent simulations. Macroscopic particle transport is governed through collision phenomena and microscopic dynamics [1]. It is well established that satisfying the PIC numerical stability criteria, notably marginally resolving the Debye length, having sufficiently time steps to resolve the plasma frequency and satisfying the Courant condition, are mandatory for physical results. When transport is governed by electrostatic turbulence or strong instabilities, meeting these criteria at their margins proves insufficient. Particularly in the case of transport of electrons and negative ions in the vicinity of the plasma sheath and of an emitting surface, the transport of charged species is affected by the PIC code numerical parameters. Sub-Debye grid refinement combined with high-order shape functions is essential to capture physical effects and obtain accurate transport coefficients using the Green-Kubo formalism.
[1] Schiesko, L., Revel, A., Minea, T., & Carbone, E. (2022). On the use of ultra-high resolution PIC methods to unveil microscale effects of plasma kinetic instabilities: electron trapping and release by electrostatic tidal effect. Plasma Sources Science and Technology, 31(4), 04LT01.
| Email address | emile.carbone@inrs.ca |
|---|---|
| Classification/Track | Invited |
| Visitor's Visa | no |
| Classification | Fundamental processes and modelling |