Erlangen 2026 – scientific programme

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P: Fachverband Plasmaphysik

P 16: Poster Session Plasma Physics

P 16.40: Poster

Thursday, March 19, 2026, 13:45–15:45, Redoutensaal

Influence of a spacially variable plasma on a cavity's resonance structure for use in a multimodal microwave cavity resonance spectroscopy approach using 3D EM-simulations — •Johanna Vogt¹, Michael Friedrichs¹, Andreas Petersen², Franko Greiner², and Jens Oberrath¹ — ¹Modelling and Simulation, South Westphalia University of Applied Sciences, 59494 Soest, Germany — ²Institute of Experimental and Applied Physics, Kiel University, 24118 Kiel, Germany

Several techniques have been developed to bridge the gap between measurable inputs and important plasma parameters, one group of which is active plasma resonance spectroscopy (APRS). In it, a wide-band electromagnetic (EM) signal is coupled into the plasma, and the frequency response of the system is evaluated via a model to yield certain parameters, which can then be used to determine the electron density. One such method is the microwave cavity resonance spectroscopy (MCRS), which analyses the shift of resonance frequencies of a cavity inside a reactor. A promising application due to its non-invasive nature is the characterisation of nanodusty plasmas, and a multimodal approach may yield a spatially resolved electron density profile.

To achieve this, a 3D-EM simulator is used to compare the spectra of a cavity filled with a spatially variable plasma to a vacuum case, and the resulting frequency shifts are analysed to determine local profiles.

We thank the Deutsche Forschungsgemeinschaft for funding this project under grant no. 531667910.

Keywords: Active plasma resonance spectroscopy; Microwave cavity resonance spectroscopy; 3D electromagnetic simulation