Disrupting the spatio-temporal symmetry of the electron dynamics in atmospheric pressure plasmas by voltage waveform tailoring

Gibson, Andrew R and Donkó, Zoltán and Alelyani, Layla and Bischoff, Lena and Hübner, Gerrit and Bredin, Jérôme and Doyle, Scott and Korolov, Ihor and Niemi, Kari and Mussenbrock, Thomas and Hartmann, Peter and Dedrick, James P and Schulze, Julian and Gans, Timo and O’Connell, Deborah (2019) Disrupting the spatio-temporal symmetry of the electron dynamics in atmospheric pressure plasmas by voltage waveform tailoring. Plasma Sources Science and Technology, 28 (1). 01LT01. ISSN 1361-6595

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Abstract

Single frequency, geometrically symmetric Radio-Frequency (RF) driven atmospheric pressure plasmas exhibit temporally and spatially symmetric patterns of electron heating, and consequently, charged particle densities and fluxes. Using a combination of phase-resolved optical emission spectroscopy and kinetic plasma simulations, we demonstrate that tailored voltage waveforms consisting of multiple RF harmonics induce targeted disruption of these symmetries. This confines the electron heating to small regions of time and space and enables the electron energy distribution function to be tailored.

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