Transients in a longitudinal Glow Discharge

The article is devoted to an experimental study of transient processes in a glow discharge (GD). The longitudinal GD was ignited in a stream of air in a cylindrical discharge chamber (DC). Copper hollow electrodes were located at a distance of a = (2 - 8) cm from each other along the axis of the DC. The gas pressure P, its flow rate G, discharge current I and its voltage U varied accordingly in the ranges: P = (4.7 - 26) kPa, G = (0 - 0.05) g / s, I = (20 - 100) mA, U = (1. 5 - 4. 2) kV. The current-voltage characteristics of the discharge were measured. The voltage decreased with increasing current, which is typical for a given type of discharge. The oscillations of the discharge voltage were registered by an oscilloscope; the current-voltage characteristic of the discharge was recorded by a two-coordinate recorder. Low-frequency (f similar to 300 Hz) and high-frequency (f similar to 100 kHz) oscillations of the discharge voltage were observed. The influence of the gas flow on the current-voltage characteristics of the discharge, its shape and the frequency of the detected oscillations is shown.