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.