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Schematic of experimental setup with photo (a) illustrating the plasma jet excited only by kilohertz AC power supply and photo (b) showing the plasma discharge by turning on the microwave power with the average input power of 200 W and DR of 20% under the joint action of microwave and AC power supplies.
The typical wave forms of the reflected and delivered power and the optical emission signal of the AP MSWP at the position of plasma column of 50 cm above the upper gap of surfaguide when the duty ratio of pulse modulation is 16%, the period of modulation is 2.5 ms, and the corresponding delivered average power of microwave is 240 W.
Plot of the mean excitation temperature (a) and gas temperature (b) versus various values of DR at the fixed peak value of microwave output power of 1500 W.
Plot of the variation of (a) mean excitation temperature and (b) mean gas temperature versus the average input power.
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