Bochum 2015 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 11: Low Temperature Plasmas I
P 11.2: Fachvortrag
Dienstag, 3. März 2015, 14:30–14:55, HZO 30
Phase resolved correlation of surface charge distribution with emission and electrical signals from an atmospheric pressure plasma jet in helium — •Torsten Gerling1, Robert Wild2, Andrei Vasile Nastuta3, Lars Stollenwerk2, Christian Wilke1, and Klaus-Dieter Weltmann1 — 1INP Greifswald, Germany — 2University Greifswald, Germany — 3Alexandru Ioan Cuza University, Iasi, Romania
A capillary plasma jet in helium close to a surface is investigated by means of phase resolved optical imaging and electrical current and voltage measurements. In addition the Pockels-effect is used to investigate the space and phase resolved distribution of surface charge on the dielectric surface in front of the plasma jet.
The phase resolved optical imaging reveal the discharge dynamics with a dielectric barrier discharge between the two ring electrodes as well as plasma bullets exiting the capillary. In addition, the discharge dynamics are simultaneously observed on the current signal. Finally, the contribution will correlate these results with the phase resolved distribution of surface charge. It is concluded, that the charge exchange between the jet and the surface occurs within the channel that is left behind by the plasma bullet and not from the bullet itself.