Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 10: Poster Session I

P 10.14: Poster

Dienstag, 1. April 2025, 16:15–18:15, ZHG Foyer 1. OG

3D EM-simulation of the influence of non-ideal cavities on their resonance behaviour to be applied in microwave cavity resonance spectroscopy — •Johanna Vogt¹, Michael Friedrichs¹, Andreas Petersen², Franko Greiner², and Jens Oberrath¹ — ¹South Westphalia University of Applied Sciences, 59494 Soest, Germany — ²Institute of Experimental and Applied Physics, Kiel University, 24118 Kiel, Germany

To extract plasma parameters from a plasma, active plasma resonance spectroscopy (APRS) was developed, which works by measuring the frequency response of a plasma subjected to a wide-band radio frequency signal. The resulting spectrum is analysed, and with the use of a model, the electron plasma frequency is calculated. This in turn is used for determining the plasma electron density. A specific version of APRS is microwave cavity resonance spectroscopy (MCRS), in which an electromagnetic (EM) wave is coupled into a resonant cavity containing a plasma. Due to its non-invasive character, MCRS is a good candidate to be applied in nanodusty plasma.

The spectrum of a cavity is influenced by its geometry and materials. To determine plasma parameters from these spectra, detailed knowledge of this influence is necessary. To this extent, the results of a 3D EM simulation of the influence of several non-ideal alterations on the resonance spectrum is investigated and compared to an ideal cylindrical cavity.

This project was funded by Deutsche Forschungsgemeinschaft (DFG), Project No. 531667910, which we gratefully acknowledge.

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