Bochum 2015 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 15: Poster Session - Magnetic Confinement

P 15.3: Poster

Dienstag, 3. März 2015, 16:30–18:30, Foyer Audimax

Design of an novel antenna for EBW heating in FLIPS — •Lukas Rudischhauser, Kirill Rumiantcev, and Walter Kasparek — Institut für Grenzflächenverfahrenstechnik und Plasmatechnologie, Universität Stuttgart, Germany

Electron Bernstein waves (EBW) are electrostatic waves which do not have an O-wave cutoff. This enables them to penetrate into overdense plasmas and be absorbed at multiples of the electron cyclotron resonance frequency. These waves cannot propagate in free space, necessitating generation of EBW within the plasma volume through O-X-B or X-B conversion processes only possible for certain plasma parameters and injection angles. The aim of this work is to design a high directivity antenna which can excite EBW in FLIPS (Flexible Linear Plasma Experiment Stuttgart). We use commercial and scientific software such as CST MS and PROFUSION to produce two designs, a Vlasov-type cut waveguide and a circular slotted waveguide antenna. This second design is to line the inside of the vessel with rotational symmetry, simplifying comparison to numerical results. To find optimal injection angles and polarisations extensive use is made of simulations using a FD3D code and previous work on the plasma configuration in FLIPS. In a first step radiation pattern measurements outside of the plasma will be performed, the antenna will then be installed and generation of EBW indirectly shown by increased heating in the overdense plasma region.