Göttingen 2025 – scientific programme
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P: Fachverband Plasmaphysik
P 10: Poster Session I
P 10.12: Poster
Tuesday, April 1, 2025, 16:15–18:15, ZHG Foyer 1. OG
Microwave cavity resonance spectroscopy (MCRS) and double probe (DP) measurements as nanodusty plasma diagnostic tools — •Andreas Petersen1, Johanna Vogt2, Michael Friedrichs2, Jens Oberrath2, and Franko Greiner1,3 — 1Institute of Experimental and Applied Physics, Kiel University, 24118 Kiel, Germany — 2South Westphalia University of Applied Sciences, 59494 Soest, Germany — 3KiNSIS, 24118 Kiel, Germany
Measuring plasma parameters like ne and Te in a nanodusty plasma is still a challenge as it requires a non-invasive diagnostic method. An excellent candidate for this purpose is MCRS. Only electrons are affected, as the probing microwave frequency is ω > ωp. The approach can be described well for a sealed cavity with N ports. However, analysing nanodusty plasmas requires additional access to the cavity (holes, slits). A theoretical model of the cavity modes and the coupling of the ports is required. We present a suitable experimental cavity design and compare to numerical models. Furthermore, double probe measurements in an argon plasma inside the cavity are considered, as they are a good stepping stone for the diagnosis of nanodusty plasmas.
We gratefully acknowledge funding by Deutsche Forschungsgemeinschaft (DFG), Project No. 531667910
Keywords: Microwave cavity resonance spectroscopy; double probe; plasma diagnostic; nano dust