München 2019 – scientific programme
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P: Fachverband Plasmaphysik
P 9: Atmospheric Pressure Plasmas II - Helmholtz Graduate School III
P 9.5: Talk
Tuesday, March 19, 2019, 12:15–12:40, HS 21
Phase-resolved study of single microdischarges in cathodic pin polarity of a metal pin-to-hemispherical dielectric-covered electrode arrangement — •Sina Jahanbakhsh1, Volker Brüser1, and Ronny Brandenburg1,2 — 1Leibniz-Institut für Plasmaforschung und Technologie (INP), Felix-Hausdorff-Str. 2, 17489 Greifswald — 2Institut für Physik, Universität Rostock, Albert-Einstein-Straße 23*24, 18059 Rostock
Single microdischarges (MDs) in a barrier corona arrangement are investigated. The discharge is operated in atmospheric pressure, and dry air at 300 SCCM flowrate is used to flush the discharge cell. The radius of curvature of stainless steel pin and the hemispherical alumina-covered electrode are 0.2 and 2 mm, respectively. A sinusoidal voltage at the frequency of 7.5 kHz and amplitude of 11.5 kVpp is applied. Using an ICCD camera and a Rogowski coil current probe, images and current pulses of MDs are recorded simultaneously. Multi-dimensional time correlated single photon counting (TC-SPC) is used to record the phase-resolved spatio-temporal development of the MDs. The properties of MDs apearing in the two polarities of the sinusoidal voltage differ significantly. This contribution will focus on the results of the cathodic pin polaritty. In this polarity, MDs have an erratic behavior in terms of inception phase and current pulse amplitude. Using phase-resolved diagnostic techniques, it is shown that, depending on the inception phase, the development and properties of the MDs vary significantly. MDs appearing in low and high applied voltages are similar to DBD microdischarges and transient sparks, respectively.