Greifswald 2024 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 6: Poster I

P 6.2: Poster

Montag, 26. Februar 2024, 16:30–18:30, ELP 6: Foyer

Deducing line-integrated density, collision frequency and density profile of an atmospheric plasma torch from microwave diagnostics — •Christos Vagkidis, Eberhand Holzhauer, Walter Kasparek, Alf Köhn-Seemann, Stefan Merli, Mirko Ramisch, Andreas Schulz, and Günter Tovar — IGVP, University of Stuttgart, Germany

Microwaves are crucial in plasma applications, either as a heating mechanism or diagnostics tools. In this work we are utilizing high-frequency microwaves to deduce fundamental information of an atmospheric plasma torch. A network analyzer is used in order to measure the phase shift and the attenuation of a microwave that transverses the plasma torch. These measured quantities are directly related to the line-integrated density and the electron-neutral collision frequency of the torch through the plasma index of refraction. Additionally, the microwave is scattered due to the interaction with the plasma and this scattering depends on the plasma density profile. By moving the receiving antenna of the network analyzer, perpendicularly to the plasma torch, the beam scattering profile can be measured. Numerical full-wave simulations in a 3D domain have been carried out, which allow a variation of the density profile over a wide parameter range. Direct comparison of the experimental scattering profile against the simulations enables a precise estimation of a 2D density profile of the plasma torch.

Keywords: fdtd; microwave diagnostics; numerical simulations; comsol; collision frequency