Vlasov simulation of the emissive plasma sheath with energy-dependent secondary emission coefficient and improved modeling for dielectric charging effects

A one-dimensional Vlasov–Poisson simulation code is employed to investigate the plasma sheath considering electron-induced secondary electron emission (SEE) and backscattering. The SEE coefficient commonly treated as constant in a range of simulations; here, an improved model charged dielectric wall constructed, which includes charging effect on energy dependency coefficient. Pertinent algorithms implement previously mentioned are studied detail. It found that increases with amount negative charges, turn reduces emissive potential. With energy-dependent coefficient, potential nonlinear function temperature, opposed linear relation predicted by classic theory. Simulation combining both wall-charging coefficient’ suggests space-charged limited formed at high temperature levels, where surface saturate. Additionally, different backscattering kinetic tested compared. Converting backscattered electrons via effective barely affects properties. results shown be commensurate upgraded theory predictions.