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P: Fachverband Plasmaphysik

P 13: Magnetic Confinement

P 13.4: Poster

Dienstag, 14. März 2017, 16:30–18:30, HS Foyer

Numerical Investigation of Microwave Propagation at the Stellarator TJ-K — •Lennart Bock, Gabriel Sichardt, Eberhard Holzhauer, Carsten Lechte, and Mirko Ramisch — Institute of Interfacial Process Engineering and Plasma Technology, University Stuttgart

The plasma of the stellarator TJ-K allows electron cyclotron radiation to propagate through the whole torus via multiple reflections and to be detected with a dedicated diagnostics. In a first step, 2D full wave simulations were used to analyze microwave propagation in both, toroidal and poloidal cross section. The solving algorithm implements the Finite Difference Time Domain method and assumes a fixed ion background. Plasma density profiles and magnetic background fields were chosen representative for TJ-K. The simulation incorporates the geometry of the receiver system including an antenna at the outer port and a reflecting mirror on the inside wall of the torus. Different geometrical configurations were simulated to optimize the weighting function of the receiving system. Furthermore, the importance of the resonator geometry of TJ-K with its highly reflective walls was investigated. In a next step, the simulation was extended to 3D and implemented in the IPF-FD3D code in order to cover the full toroidal geometry of TJ-K for a full extent analysis of the weighting function. The stellarator’s realistic magnetic background field was implemented and the density profile was modeled to be constant on the flux surfaces. This contribution compares 2D with 3D results and is considered essential for the interpretation of experimental results from the measuring system.