Hannover 2016 – scientific programme

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P: Fachverband Plasmaphysik

P 25: Poster Session- Theory and Modelling

P 25.7: Poster

Thursday, March 3, 2016, 16:30–19:00, Empore Lichthof

Eigenmode solver for electromagnetic waves in metallic structures — •Sander Coene, Burkhard Plaum, and Thomas Hirth — IGVP, Universität Stuttgart, Germany

To achieve a fusion plasma, a low-pressure gas must first be heated. In order to add energy to the plasma a waveguide and antenna set-up is used to focus an electromagnetic wave into the plasma. If one has knowledge about the eigenmodes in such a waveguide, calculations of wave propagation are immensely simplified in terms of computational time. For standard cross-section shapes (rectangular, circular, ...) analytical solutions exist, but in search of more exotic cross-section shapes that help feed into the fusion plasma, a numerical approach is needed in the form of an eigenmode solver. The development of such a solver can for instance also prove beneficial for designing imaging waveguides with an increased angular range, which are used for fusion plasma diagnostics (e.g. reflectometry and ECE imaging) or for heating (e.g. remote steering).

In these application fields, a high accuracy for the resonance frequencies is of the greatest importance. Therefore we analyze how well-established methods in current high performance computer architecture compare with more modern approaches to obtain the transversal eigenmodes.