Full text loading...
Quasi-1D dielectric barrier discharge arrangement.
Contour plot showing the time evolution over 5 cycles of the transverse distribution of the ion density (averaged along the discharge axis and over a time step of 1 μs) as predicted by the fluid model. Neon, 100 torr, 2 mm gas gap, 2 mm dielectric layer thickness, 2 cm transverse dimension, and voltage amplitude and frequency 600 V and 20 kHz, respectively. The initial electron and ion density is a centered Gaussian along the transverse direction, uniform in the discharge direction, with a maximum of 108 cm−3 and a standard deviation of 1 mm. The applied voltage and calculated current are plotted as a function of time on top of the figure. Same color bar as Fig.4, unit 4 × 109 cm−3 (density is averaged along x).
Space (x and y) distribution of the ion density (colors), and electric potential contours in the gap (lines) at three times (indicated t1, t2, t3—see Fig. 2) in the conditions of Fig. 2. The dielectric layers are in grey. Same color bar as Fig. 4, units t1:2.4 × 1011 cm−3, t2: 2.3 × 1010 cm−3, t3: 8 × 109 cm−3.
Contour plot showing the time evolution of the transverse distribution of the ion density in the same conditions as in Fig. 2 but on a much longer time scale (the plotted density is averaged over time steps of 1 cycle instead of 1 μs in the case of Fig. 2, and along x). Unit 109 cm−3.
Contour plot showing the time evolution of transverse distribution of the ion density (averaged along x and on time intervals of 1 cycle) in conditions similar to Fig. 2 except for the voltage amplitude which is close to the minimum sustaining voltage amplitude, i.e., (a) 500 V, (b) 500 V, and (c) 504 V. Voltage frequency is 20 kHz. The initial electron and ion density consist of two filaments with Gaussian density distributions of maximum 108 cm−3, standard deviations of 1 mm and separated by (a) 4 mm, and (b), (c) 2 mm. Unit is 6 × 108 cm−3, color bar as in Fig. 4.
Images of the quasi-1D DBD of Fig. 1 over successive cycles showing the generation and annihilation of filaments (argon, 50 torr, 3 mm gap, 1 kV, and 1 kHz).
Examples of filament motion over several half-cycles, within a self-organized structure, (a) experiments12 (1, 1 + 2, 1 + 2 + 3,… mean that the corresponding images are integrated in time over, 1, 2, 3,… successive half-cycles) and (b) simulations (images integrated over successive half-cycles).
Article metrics loading...