Hannover 2020 – scientific programme

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P: Fachverband Plasmaphysik

P 2: Atmospheric-pressure plasma and applications 1

P 2.1: Invited Talk

Monday, March 9, 2020, 11:00–11:30, b305

Streamer inception and imaging in various atmospheres — •Sander Nijdam, Siebe Dijcks, and Shahriar Mirpour — Eindhoven University of Technology, The Netherlands

Streamers are the first stage of many discharges involving high voltages. They consist of a propagating ionization front leaving behind a trail of conductive, quasi-neutral plasma. In this contribution we will show experiments on streamers revealing some of their most important properties: their inception and their propagation and branching behaviour.

We study streamer inception by applying repetitive high voltage pulses and studying the statistics of inception delay. By means of small bias pulses between the high voltage pulses, we are able to manipulate these statistics, which reveals a lot on the processes governing the inception.

Secondly, we study the propagation and branching of streamers by a combination of stereoscopic and stroboscopic measurements of 'low complexity' streamer discharges. We have developed automated routines which can determine propagation velocities, branching angles and much more from these and can directly compare these against numerical results, thereby also giving unprecedented insights into the fundamentals of such discharges.