Effects of pulse voltage rising edge on discharge evolution of He atmospheric pressure plasma jet in dielectric tube

In this work, we employ pulse voltage to drive an atmospheric pressure plasma jet (APPJ) in Helium, and consider mainly the evolution of discharge inside tube. Specifically, effects rising edge on are studied through simulation experiment. The spatiotemporal electron density, ionization source, temperature excited helium atom evaluated. Besides, mechanism affecting rise time is analyzed by parameters such as current, sheath thickness surface charge density distribution. considered cases, wave propagates ground electrode downstream active dielectric with faster has larger temperature, electric field strength. With change edge, there occur two modes: hollow mode solid barrier (DBD) area. When nanosecond sub microsecond, it develops into mode, changes after continued increase. Both modes essentially affected thickness, distribution, less than 1.8 mm, usually when equal radial propagation range limited propagation. DBD region, axial component, at beginning discharge; electrode, owing fact that applied deviated from direction, positive deposited tube wall forms a self-built field, strong formed superposition fields causes propagate mode.