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.
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