SMuK 2021 – scientific programme

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P: Fachverband Plasmaphysik

P 17: Poster II

P 17.25: Poster

Friday, September 3, 2021, 14:00–16:00, P

Study of slow wave propagation in IShTAR — •Felix Paulus, Volodymyr Bobkov, Roman Ochoukov, and Oleksii Girka — Max-Planck-Institute fürPlasmaphysik, Boltzmannstr. 2, 85748 Garching

Ion cyclotron resonance heating (ICRH) is an established technique to reach fusion relevant temperatures in modern tokamaks. While the fast Alfven wave is launched intentionally to heat the plasma, it is believed that the parasitically launched slow wave is a source for electric fields parallel to the background magnetic field (Myra & D'Ippolito, 2008). Since the slow wave (sw) propagates in low density plasma its existence remained unconsidered in tokamaks for a long time. Recent developments suggest, that the plasma density in the far SOL of a tokamak drops below the lower hybrid resonance density opening a channel for sw propagation which might induce further plasma dynamics.

Here we show results from experiments carried out on IShTAR - a linear plasma device - where we measure the slow wave, that is launched into a magnetized low-density plasma by a wire loop antenna, with a floating probe. The results are compared to FEM simulations from RAPLICASOL (Tierens, et al., 2019) and further analytical considerations. Based on these results future experiments on the ASDEX Upgrade tokamak are proposed.