Publication details

Experimental and numerical investigation of the transient charging of a dielectric surface exposed to a plasma jet

Authors

SLIKBOER Elmar VIEGAS Pedro BONAVENTURA Zdeněk GARCIA-CAUREL Enric SOBOTA Ana BOURDON Anne GUAITELLA Olivier

Year of publication 2019
Type Article in Periodical
Magazine / Source PLASMA SOURCES SCIENCE & TECHNOLOGY
MU Faculty or unit

Faculty of Science

Citation
Web https://iopscience.iop.org/article/10.1088/1361-6595/ab3c27
Doi http://dx.doi.org/10.1088/1361-6595/ab3c27
Keywords atmospheric pressure plasma jet; dielectric surface; plasma target interaction; electric field; ionization waves; Mueller polarimetry; surface charges
Description This work investigates the dynamical charging of a surface under exposure of a non-equilibrium plasma jet at atmospheric pressure through a quantitative comparison between modeling and experiments. We show using mono-polar pulses with variable pulse duration and amplitude that the charging time (i.e. the time from impact of the ionization wave till the fall of the high voltage pulse) is a crucial element determining the plasma-surface interaction. This is done through direct measurements of the electric field induced inside the target using the optical diagnostic technique called Mueller polarimetry and comparison with the electric field calculated using a 2D fluid model of the plasma jet interaction with the target in the same conditions as in the experiments. When the charging time is kept relatively short (less than 100 ns), the surface spreading of the discharge and consequent surface charge deposition are limited. When it is relatively long (up to microseconds), the increased surface spreading and charge deposition significantly change the electric field to which the target is exposed during the charging time and when the applied voltage returns to zero.
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