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Observations of the glow-to-arc transition between thoriated tungsten electrodes with a parallel RC circuit

Using a simple discharge circuit, we have investigated effects of the circuit parameters on glow-to-arc transition behaviour. A direct current power source is used with a capacitor and resistors. Plasma is generated between thoriated tungsten electrodes at atmospheric pressure in argon. Current and voltage are recorded while capturing plasma images. A variation of the charge on the capacitor causes a fluctuation in discharge current. Due to the current fluctuation, the electric power dissipated between the electrodes increases during a temporary glow phase and decreases during a temporary arc phase. The cathode tip has been heated in the glow mode and a glow-to-arc transition occurs finally. The current fluctuation can be reduced by increasing the resistance. The temporary arc and glow durations are affected by the time constant of the circuit.