Dynamics of a nanosecond diffuse pin-to-plane discharge - Effects of pin material at high overvoltage
Résumé
The dynamics and propagation speed of a pin-to-plane discharge generated in atmospheric air under high nanosecond overvoltage is analyzed and discussed for different pin materials. Pulses of 85kV with 2ns rise time are applied to a conical pin electrode made of different materials: aluminum, titanium, stainless steel, copper, molybdenum and tungsten. Discharge propagation speed is derived from sub-nanosecond time resolved imaging of the discharge front location with an accuracy of 0.3 mm/ns. Results clearly show the slowdown of the discharge with the tungsten electrode and, to a lesser extent, with aluminum. For these two materials, the average speed can be decreased respectively by 50 and 20 % compared to the case of copper electrode.
Domaines
Physique [physics]Origine | Fichiers produits par l'(les) auteur(s) |
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