Abstract
The discharge processes in a 40-cm rod-plate air gap were experimentally studied under different air pressures. Mach-Zehnder interferometry was used to analyze the gas density and temperature evolution in the discharge channel, and the effect of air pressure on the evolution of gas density and temperature in the leader channel was obtained. When the reduced electric field E/N is constant, the decrement of the gas density and the maximum temperature in the leader temperature decreases as the pressure increases.
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