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50 10 00 −50 0.1 0.05 0 0.1 0.05 0 0.1 0.05 0 Electron density (lg cm−3) Electron energy (eV) Reduced electric field (Td) 70 80 90 100 110 120 130 140 150 Time (μs) −10 Figure 5.7: Temporal variation of voltage (- - -) and discharge current (—) (a), and spatiotemporal distribution of electron density in logarithmic scale (b), mean electron energy (c) and reduced electric field (d) for a gas pressure of 1000 mbar, and an applied voltage amplitude of 10 kV at 130 kHz frequency. is switched off are shown. There is no periodicity once the voltage is switched off; hence all the cycles are shown when the voltage is switched off. Discharge characteristics for the standard condition in periodic state are described in detail in chapter 4 and the main aspects are repeated here. As per convention, positive half-cycle is when the voltage on the powered electrode is increasing and negative half-cycle is when the voltage is de- creasing. For example, at the end of ten cycles, the voltage is increasing on the powered electrode and hence its a positive cycle. In figure 5.7a each spike in the current signal corresponds to a filament which lasts around approximately 100-200 ns. It can be seen that there is one discharge event every half-cycle. Also shown in the figure are applied voltage (10 kV amplitude sinusoidal voltage) and gap voltage which has a maximum of approximately 2 kV. The spatio-temporal dis- tribution of electron density and mean electron energy is plotted in figures 5.7b and 5.7c respectively. From the figure 5.7b, it can be seen that the electron density increases from instantaneous anode and reaches a maximum at certain distance from the instantaneous cathode. The distance from the instantaneous anode at which these maxima occur are different during positive and negative half cycles; say d0 and d1 respectively (d0 is closer to x=1 mm and d1 is close to x=0). For the standard condition d0 is approximately 250 134 5.9. RESULTS & DISCUSSION 12 10 8 6 6 4 2 300 200 100 Position (mm) Position (mm) Position (mm) J (mA/cm2) Votage (kV)PDF Image | Understanding CO2 containing non-equilibrium plasmas
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