Numerical studies of atmospheric pressure glow discharge controlled by a dielectric barrier between two coaxial electrodes |
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| Authors: | Zhang Hong-Yan Wang De-Zhen and Wang Xiao-Gang |
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| Affiliation: | State Key Laboratory of Materials Modification by Laser, Electron, and Ion Beams, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | The glow discharge in pure helium at atmospheric pressure, controlled
by a dielectric barrier between coaxial electrodes, is investigated
based on a one-dimensional self-consistent fluid model. By solving
the continuity equations for electrons, ions, and excited atoms, with
the current conservation equation and the electric field profile, the
time evolution of the discharge current, gas voltage and the surface
density of charged particles on the dielectric barrier are
calculated. The simulation results show that the peak values of the
discharge current, gas voltage and electric field in the first half
period are asymmetric to the second half. When the current reaches
its positive or negative maximum, the electric field profile, and the
electron and ion densities represent similar properties to the
typical glow discharge at low pressures. Obviously there exist a
cathode fall, a negative glow region, and a positive column. Effects
of the barrier position in between the two coaxial electrodes and the
discharge gap width on discharge current characteristics are also
analysed. The result indicates that, in the case when the dielectric
covering the outer electrode only, the gas is punctured earlier
during the former half period and later during the latter half period
than other cases, also the current peak value is higher, and the
difference of pulse width between the two half periods is more
obvious. On reducing the gap width, the multiple current pulse
discharge happens. |
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| Keywords: | dielectric barrier discharges atmosphere pressure glow
discharge plasma numerical simulation |
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