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Understanding CO2 containing non-equilibrium plasmas

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Understanding CO2 containing non-equilibrium plasmas ( understanding-co2-containing-non-equilibrium-plasmas )

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3.3. RESULTS 3. PROPERTIES OF MICRO-DISCHARGES 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 200 mbar, 400 mbar, 600 mbar, 800 mbar, 200 mbar, 400 mbar, 600 mbar, 800 mbar, 200 mbar, 400 mbar, 600 mbar, 800 mbar, first filament first filament first filament first filament second filament second filament second filament second filament All filaments All filaments All filaments All filaments 0.01 0.1 1 Pavg (W) Figure 3.11: Plot showing the charge transferred in the first filament alone (closed symbols), second filament alone (open symbols) and all the filaments in a half cycle (semi closed symbols). The dashed line at 0.5 nC is to accentuate the fact that the charge transferred in first filament is approximately constant across the pressure and power range. See the text for error analysis. 3.3.5 Imaging studies A series of images for a typical operational condition are shown in a tabular format in the figure 3.12; this series of images illustrates qualitative features observed at all the conditions in general. A filament is said to be positive, if during its occurrence, the voltage on the powered electrode is increasing and it is called negative if the voltage is decreasing. In the figures the left electrode is powered and the right one is grounded. The top row shows images of three different types of filaments, namely the first positive filament, the first negative filament and the second positive filament. And the bottom row shows their corresponding current oscillograms with time-windows (TW) shown as rectangular boxes schematically. Since the background current signal is a capacitive response of applied voltage it is 900 out of phase with the applied voltage. As a result the background is decreasing for a positive filament and increasing for a negative filament. In principle, there should be no difference between a positive filament and negative filament in a symmetric DBD like the one used for this work, provided its sequence in a half cycle is same; for example, first positive filament in a positive HC and first negative filament in a negative HC are equivalent. During a positive filament, grounded electrode 57 Qcap (nC)

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