Simulation Study on the Self-Sustained Oscillations in DC Driven Glow Discharges at Atmospheric Pressure Under Different Gas Gaps  

作　　者：王晓菲 贺亚峰 刘富成 

机构地区：[1]Hebei Key Lab of Optic-electronic Information and Materials,College of Physics Science and Technology,Hebei University

出　　处：《Plasma Science and Technology》2015年第6期461-468,共8页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.11205044 and 11405042);Hebei Natural Science Fund of China(Nos.A2012201015 and A2011201006);the Research Foundation of Education Bureau of Hebei Province of China(No.Y2012009);the Postdoctoral Science Foundation of Hebei Province of China(No.B2014003004);the Postdoctoral Foundation of Hebei University

摘　　要：In this paper, a one-dimensional plasma fluid model is employed to study the self- sustained oscillations in DC-driven helium glow discharges at atmospheric pressure under different gas gaps. Our simulation results indicate that a harmonic current oscillation with tiny amplitude always occur at the onset of instability and transits into a relaxation one as the conductivity of the semiconductor is decreased. It is found that the dynamics of the oscillations are dependent on the gas gaps. The discharge can only exhibit a simple oscillation with unique amplitude and frequency at smaller gas gaps （〈2 mm） while it can exhibit a more complex oscillation with several different amplitudes and frequencies at larger gas gaps （〉2 mm）. The discharge modes in these current oscillations have also been analyzed.In this paper, a one-dimensional plasma fluid model is employed to study the self- sustained oscillations in DC-driven helium glow discharges at atmospheric pressure under different gas gaps. Our simulation results indicate that a harmonic current oscillation with tiny amplitude always occur at the onset of instability and transits into a relaxation one as the conductivity of the semiconductor is decreased. It is found that the dynamics of the oscillations are dependent on the gas gaps. The discharge can only exhibit a simple oscillation with unique amplitude and frequency at smaller gas gaps （〈2 mm） while it can exhibit a more complex oscillation with several different amplitudes and frequencies at larger gas gaps （〉2 mm）. The discharge modes in these current oscillations have also been analyzed.

关 键 词：OSCILLATION Townsend discharge glow discharge subnormal glow discharge discharge mode 

分 类 号：O53[理学—等离子体物理] O461[理学—物理]