Cold large-diameter plasma jet near atmospheric pressure produced via a triple electrode configuration

In this letter, a triple electrode discharge configuration is presented for producing large-diameter plasma jet near atmospheric pressure. Different from various cold atmospheric pressure plasma jets via concentric dielectric barrier discharge (DBD) configurations, the novel kind of large-diameter plasma jet generates with much larger dimension in diameter in pure argon or Ar/N2 mixture near atmospheric pressure (750 torr). The voltage and current waveform (I–V) measurement indicates that the discharge composes of two consequent sections, one of which occurs as coaxial DBD mode while the other forms large-diameter plasma jets. The overall temperature of the plasma is determined to be about 300 K by fitting the plasma optical emission bands of N2(B-C) and OH(A-X). Therefore the plasma is believed as cold as those atmospheric pressure plasma jets with concentric DBD configurations.