Sparkover Time Lag of Gap Having a Protrusion in Anode

Using a special gap providing a needle protrusion in the anode, values of time lag τ from the start of UV irradiation to sparkover under DC voltages are measured. The dstribution of log τ for the applied voltage shows a slim and linear pattern over about 10% voltage range from the minimum value. The linear region in log τ-V diagram moves consistently depending on the..