Discharge characteristics of one-dimensional plasma jet array at atmospheric pressure

Atmospheric pressure low-temperature plasma jet has become one of the hot research issues in plasma science and technology, and a plasma jet array is a tendency for plasma jet application. In this paper, atmospheric pressure low-temperature plasma jet array is generated by a one-dimensional device of two quartz tubes with a single ring electrode configuration, and the feed gas is helium. The discharge excitation power is a repetitive nanosecond-pulse generator. The main discharge parameters such as applied voltage, total discharge current, emission spectra were measured. Results show that nanosecond pulses can produce a stable one-dimensional plasma jet array. The produced two plasma jets fired in the same initiate voltage and show the well uniformity. When the quartz tube placed extremely closely, with the increase of gas flow, the visual length of one tube remain unchanged, which has much weaker intensity than another. Because the asymmetric electric field distribution, a great quantity of charges shift to one tube, forming the coupling phenomenon. Experimental results show that with the distance increase between two tubes, both the jet length and intensity are decreased.