Effects of excitation voltage pulse shape on the characteristics of atmospheric-pressure nanosecond discharges

Zoltán Donkó*, Satoshi Hamaguchi, Timo Gans

*Corresponding author for this work

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The characteristics of atmospheric-pressure microdischarges excited by nanosecond high-voltage pulses are investigated in helium-nitrogen mixtures, as a function of the parameters of the excitation voltage pulses. In particular, cases of single-pulse excitation as well as unipolar and bipolar double-pulse excitation are studied, at different pulse durations, voltage amplitudes, and delay times (for the case of double-pulse excitation). Our investigations are carried out with a particle-simulation code that also comprises the treatment of the VUV resonance radiation in the plasma. The simulations allow gaining insight into the plasma dynamics during and after the excitation pulse, the development and the decay of charged particle density profiles and fluxes. We find a strong dependence of the electron density of the plasma (measured at the end of the excitation pulse) on the electrical input energy into the plasma and a weak influence of the shape of the excitation pulse at the same input energy.

Original languageEnglish
Article number075004
JournalPlasma Sources Science and Technology
Issue number7
Publication statusPublished - 24 Jul 2019

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  • nanosecond discharges
  • particle simulation
  • resonance radiation

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