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3.4. DISCUSSION 3. PROPERTIES OF MICRO-DISCHARGES acts as instantaneous cathode where cathode fall region is observed and during a negative filament it is formed on the powered electrode. The formation of this cathode fall region (regions of high light intensity near electrodes) can be clearly seen in the figures 3.12a and 3.12b. Cathode fall region forms instantaneously and spreads across the surface in less than 1 ns and has a reduced electric field which is as high as 4000 Td in air[146]. Similar measurements of cathode fall region have been reported in mixtures of N2/O2 by [141, 147] using a pin-pin DBD reactor similar to the one used in this work. However, to our knowledge this is the first time such measurements have been reported in CO2 DBDs. Only first two filaments in a half cycle could be imaged because of their low jitter in time between cycles; from the third filament onwards the variation in temporal location is bigger and as a consequence, for any chosen time-window, it could not be guaranteed that only the chosen filament is imaged. As an example, if the third filament in a given half-cycle is targeted by selecting a time-window, due to the jitter the third filament could be out of it or it could appear along with fourth filament etc., The first filament in a HC always appears between the electrodes whereas the second filament extends farther on the electrodes avoiding the location where the first filament has already occurred. This extension can be seen from the cathode fall region of the second filament shown in figure c of figure 3.12. Also, there is a greater variation in the location of the second filament (foot of the filament on the electrode) and this variation increases further with the third filament and so on. 3.4 Discussion Since a single power-law relation that is valid at all pressures is found between Navg with Pavg, it could be expected that the difficulty in creating new filaments could also be the reason behind power-law relation observed between α and Espec (equation 3.4). Here, first, the reasons behind power-law relation between Navg and Pavg will be ex- plained using results explained in previous sections. Later, the connection between the two power-law relations will be explored. When Pavg is ≈ 0.05 W, the first filament appears irrespective of pressures (see figure 3.9). Each filament carries a charge of 0.5 nC and is located always between the electrodes, bridging the shortest gap. Once the first filament bridges the gap, it transports charge (∆Qf1) to the cathode; this deposited charge on instantaneous cathode distorts the electric field and opposes the development of second filament. However, when the voltage is increased such that Pavg is greater than 0.5 W, a second filament appears. The second filament in a HC spreads deep on the sur- face of the instantaneous cathode. The distortion in electric field by ∆Qf 1 will make the 59PDF Image | Understanding CO2 containing non-equilibrium plasmas
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