Influence of Penning effect on the plasma features in a non-equilibrium atmospheric pressure plasma jet

Journal Article · Fri Mar 14 04:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4868223· OSTI ID:22277891

Chang, Zhengshi; Zhang, Guanjun ^[1]; Jiang, Nan; Cao, Zexian ^[2]

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1. School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049 (China)
2. Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)

Non-equilibrium atmospheric pressure plasma jet (APPJ) is a cold plasma source that promises various innovative applications. The influence of Penning effect on the formation, propagation, and other physical properties of the plasma bullets in APPJ remains a debatable topic. By using a 10 cm wide active electrode and a frequency of applied voltage down to 0.5 Hz, the Penning effect caused by preceding discharges can be excluded. It was found that the Penning effect originating in a preceding discharge helps build a conductive channel in the gas flow and provide seed electrons, thus the discharge can be maintained at a low voltage which in turn leads to a smaller propagation speed for the plasma bullet. Photographs from an intensified charge coupled device reveal that the annular structure of the plasma plume for He is irrelevant to the Penning ionization process arising from preceding discharges. By adding NH{sub 3} into Ar to introduce Penning effect, the originally filamentous discharge of Ar can display a rather extensive plasma plume in ambient as He. These results are helpful for the understanding of the behaviors of non-equilibrium APPJs generated under distinct conditions and for the design of plasma jet features, especially the spatial distribution and propagation speed, which are essential for application.

• OSTI ID: 22277891
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 10 Vol. 115; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AMMONIA
ARGON
CHARGE-COUPLED DEVICES
COLD PLASMA
ELECTRIC DISCHARGES
ELECTRIC POTENTIAL
ELECTRONS
HELIUM
IONIZATION
PENNING EFFECT
PHOTOGRAPHY
PLASMA JETS
PLASMA PRESSURE
SPATIAL DISTRIBUTION