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Description
Electrical discharges are transient phenomena highly sensitive to the geometric and dielectric properties of their surrounding environment. Such a dependence directly influences plasma-surface interactions and the efficiency of a related application. This study investigates experimentally and by simulation the propagation dynamics of nanosecond discharge in air gap with the presence of a hemispherical dielectric layer (HDL). Experimentally, the HDL was fabricated using 3D printing of opaque resin that has a dielectric permittivity εr = 3. Its diameter and thickness can be finely adjusted during printing. Herein, we investigate the influence of HDL’s thickness (100-1000 µm) on the dynamics of the discharge generated inside and outside of the HDL using an ICCD camera. To further determine the spatial and temporal properties of the discharge, numerical simulations are performed by adapting a 2D fluid model [1]. The simulation predicts the spatial evolution of electrons density and electric field inside and outside of the HDL. After being validated for the experimental cases, the model is employed to investigate the role of εr (3, 40, 80) on the discharge properties. The results offer new insights for understanding plasma-surface interactions which is highly needed for many applications.
| Keyword-1 | Electrical discharges |
|---|---|
| Keyword-2 | simulation |