Study of generation and investigation of nanosecond pulsed plasma jet

Three atmospheric nanosecond pulsed plasma jets are studied based on three different configurations. The first consists of an injection needle placed inside a hollow dielectric tube,while the second employs a ring electrode wrapped around a dielectric tube. The third is a hybrid of the first two configurations. The characteristics of the jets are diagnosed by optical and electrical methods,and the mechanism is studied. For these three plasma jets,the rotational temperature are all 295K,while the vibration temperature are 1900K,2000K,and 2100K,respectively. The results above demonstrate that plasmas generated by these three nanosecond pulsed plasma jets are of the state of nonequilibrium. Furthermore,the investigation suggests that the hybrid jet with both the needle and the ring electrode connecting to the high-voltage has a better performance,for which a uniform and stable discharge with low temperature and higher reactive species is achieved. It is conceivable that the cold atmospheric nanosecond pulsed plasma jets have a great potential of application in the area of material processing,plasma chemistry and plasma medicine,etc.