Open AccessIonization waves in nanosecond pulsed atmospheric pressure plasma jets in argon
Author(s) -
Huang Bangdou,
Zhang Cheng,
Zhu Wenchao,
Lu Xinpei,
Shao Tao
Publication year - 2021
Publication title -
high voltage
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.732
H-Index - 20
ISSN - 2397-7264
DOI - 10.1049/hve2.12067
Subject(s) - electric field , nanosecond , ionization , atomic physics , voltage , argon , plasma , atmospheric pressure , materials science , optics , leading edge , ion , chemistry , physics , laser , mechanics , meteorology , quantum mechanics , organic chemistry
Typical ionization waves (IWs) are observed during the propagation of nanosecond pulsed atmospheric pressure plasma jets (APPJs) with argon flow, combining both the measurement of the axial electric field ( E z ) and the temporal resolved optical imaging. The movement of the luminous APPJ head is recognized as the development of the IW front, accompanied with the propagation of the peak electric field. Especially, the radial distribution of E z transits from a central peak profile before the IW front arrives to a hollow profile after the pass of the IW front. As for the temporal E z trend, there is a mode transition from the single‐peak feature under a low peak voltage to the double‐peak feature under a higher peak voltage, indicating the existence of both primary and secondary IWs. The effect of target conditions on the IWs in APPJs is also explored. With a metal target, no residual electric field is observed before imposing the high‐voltage pulses. However, with a dielectric target, the residual surface charges generate a background electric field in the opposite direction to that during IW propagation. In the free APPJ (with no target), on the voltage falling edge, a negative electric field drives the electron flow to compensate the positive ions left over during the forward IW propagation on the voltage rising edge.