Abstract
Pulsed discharge plasma and its application is one of the promising directions in civilian areasof pulsed power technology. In order to promote the research and development ofthe theory and application technology for pulsed discharge plasma, in thispaper, recent progress on the mechanism of nanosecond-pulse gas discharge andthe characteristics and applications of typical pulsed plasma at the Instituteof Electrical Engineering, Chinese Academy of Sciences is reviewed. Firstly,progress on mechanism of nanosecond-pulse discharge based on runaway electronsand measurement technology of runaway electrons is introduced. Then, thecharacteristics of three typical discharges, including direct-driven pulseddischarge, pulsed dielectric barrier discharge and pulsed plasma jet, arereviewed. Furthermore, typical plasma applications of pulsed plasma on surfacemodification and methane conversion are presented.
Highlights
In recent years, atmospheric pressure non-thermal plasma has attracted intensive attentions due to its various applications, such as environmental protection, surface modification, medical application, flow control, ignition and combustion [1,2,3]
The plasma discharges can be characterised as arc discharge, corona discharge, gliding discharge, glow discharge and dielectric barrier discharge (DBD), and are usually driven by direct current (DC), alternating current (AC), radio frequency (RF) and microwave frequency power supplies [4]
The electric field intensity (E/N) value of DC glow discharge is close to breakdown threshold (∼100 Td in air)
Summary
Atmospheric pressure non-thermal plasma has attracted intensive attentions due to its various applications, such as environmental protection, surface modification, medical application, flow control, ignition and combustion [1,2,3]. The discharge characteristics of plasma are determined by driven power supplies, discharge modes and applied conditions. The traditional discharges such as DC, AC and shock pulse-driven plasma have been well studied. The gas excitation is based on electron rotation and transition It is usually generated under low pressure and close to room temperature. The applied voltage will directly act on gas current These discharges are quite different, all of them can be well explained by traditional Townsend theory and streamer theory. The nanosecond-pulse discharge is produced by an overvoltage (ten times than the breakdown voltage) and develops in the form of a fast ionisation wave (FIW) [6]. (i) Describe the pulsed discharge mechanism: high-energy runaway electrons and X-ray. (ii) Analyse the pulsed discharge characteristics in three types of discharges: diffuse discharge, DBD and plasma jet. (iii) Summarise the typical pulsed discharge plasma applications on material surface modification and methane conversion
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