Abstract
Evolutions of distortions in voltage and current waveforms in atmospheric pressure radio frequency (RF) symmetrical alpha-mode discharges were obtained by varying the driving frequency and the length of connection coaxial cable in the external circuit. Based on the fast Fourier transform analysis on waveforms, the pronounced current and voltage waveforms are, respectively, attributed to series and parallel resonances occurring between the atmospheric pressure RF plasma and the external circuit. Despite the weak nonlinearity due to the geometrical symmetry and high collision-frequency at atmospheric pressure, variations of the external circuit such varying the length of the connecting cable can still influence discharges at an equal power.
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