Study On Bifurcation And Chaos In Dielectric Barrier Discharge In Helium At Atmospheric Pressure

Among the methods used for producing low-temperature plasmas, the dielectric barrierdischarge at atmospheric pressure have numerous industrial applications such as materialmodification, micro-electronic, medical treatment, environmental protection and so on. Theatmospheric dielectric barrier discharge operating without vacuum, can be used in industrialproduction efficiently. So it attracts plenty of attention in the plasma physical research field.Study on time-domain bifurcation and chaos in the discharge will be of great help to make abetter understanding of mechanism dynamic in dielectric barrier discharge, providingsignificant theoretical basis for obtaining stable atmospheric dielectric barrier discharge. Toimprove and supplement the existing research subject related to time-domain bifurcation andchaos in atmospheric dielectric barrier discharge, this article studies the asymmetricalperiod-one discharge, inverse bifurcation, quasi-periodic discharge and intermittent chaos inatmospheric helium dielectric barrier discharge in the experimentation perspective with thetheory of nonlinear analysis. The main content of this work shows as follows:Firstly, this article studies the asymmetrical period-one discharge under a large rangeof parameters for the gas gap width and driving voltage frequency. The effect of gas gapwidth and frequency on the asymmetrical period-one discharge is also discussed. Theresearch results show that the asymmetrical discharge is not just caused by the asymmetryof system parameters, it can also be inherent and internal high-frequency unstable dischargebehavior of system in a certain ranges of parameters.Secondly, with the increase of applied voltage peak-peak value, the discharge currentexperienced chaos, period-4, period-2and period-1successively by means of inversebifurcation under a certain ranges of parameters. With the Fourier transform, the nonlinearcharacteristics of discharge are confirmed. Our work verifies that the phenomenon of inversebifurcation in dielectric barrier discharge at atmospheric helium pressure can observed inexperiment, beside in numerical simulations.Thirdly, with increasing applied voltage peak-peak value, the discharge currentexperienced period-9, period-11, quasi-periodic and period-1successively. It verifies that thequasi-periodic discharge at atmospheric helium pressure can observed in experiment. Thenthe discharge current experienced period-1, period-2, quasi-periodic, period-13, period-11,period-9, period-7, period-5, period-2and chaos successively with the decrease of appliedvoltage peak-peak value. It verifies that the quasi-periodic route into chaos in dielectric barrier discharge at atmospheric helium pressure can observed in experiment, beside innumerical simulations.Fourthly, period-3discharge can be readily observed in a large of parameters for thedriving voltage peak-peak value and voltage frequency. According to the theory of period-3means chaos, the system of dielectric barrier discharge exists chaos actually. With increasingapplied voltage peak-peak value, the discharge current experienced chaos, period-3, period-6, chaos and period-1successively. Our work firstly reported the intermittent chaos and itsroute into chaos in dielectric barrier discharge at atmospheric helium pressure in experiment.The three typical routes into chaos in dielectric barrier discharge at atmosphericpressure have been reported so far. Our research further improve and supplement the existingresearch subject related to time-domain bifurcation and chaos in atmospheric dielectricbarrier discharge. It also gives reference to continue the study on time-domain bifurcationand chaos in atmospheric dielectric barrier discharge.