Hannover 2020 – scientific programme
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P: Fachverband Plasmaphysik
P 7: Atmospheric-pressure plasma and applications 2
P 7.4: Talk
Tuesday, March 10, 2020, 12:00–12:15, b305
Atmospheric pressure RF plasma jets driven by tailored voltage waveforms in He/N2 mixtures — •Ihor Korolov1, Marc Leimkühler1, Mark Böke1, Zoltán Donkó2, Volker Schulz-von der Gathen1, Lena Bischoff1, Gerrit Hübner1, Péter Hartmann2, Timo Gans3, Yue Liu4, Thomas Mussenbrock4, and Julian Schulze1,5 — 1Ruhr-University Bochum, Germany — 2Wigner Research Centre for Physics, Hungary — 3University of York, United Kingdom — 4Brandenburg University of Technology Cottbus-Senftenberg, Germany — 5School of Physics, Dalian University of Technology, China
Micro atmospheric pressure plasma jets (µAPPJ) can efficiently generate different reactive species at the buffer gas temperatures which are close to the ambient temperature. These reactive species are suited for various applications: wound healing, sterilization, cancer treatment, surface modification, etc. In this work, we investigate the µAPPJ operated in mixtures of He and N2 and driven by tailored voltage waveforms both experimentally by using tunable diode-laser absorption spectroscopy and via kinetic Particle-in-Cell/Monte Carlo simulations. We find an excellent agreement between the results of experiment and simulations over a wide range of conditions for the spatially resolved and averaged helium metastable density. The latter is found to be significantly enhanced by increasing the number of consecutive driving harmonics. The results show that voltage waveform tailoring allows one to enhance the control over the electron energy distribution function to optimize the excited species generation.