Influence of Oxygen Impurity on the Atmospheric Pressure Helium Plasma Jet Behavior

Trace of oxygen adding to the helium atmospheric pressure plasma jet can make the jet behave differently, such as dimming the plume and changing the jet length as well as the discharge current. Moreover, with certain specific ratio of oxygen/helium, double-bullet phenomenon could be captured by intensified charge couple device. The speeds of the bullets are estimated to be several kilometers per second.