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P: Fachverband Plasmaphysik
P 5: Poster I
P 5.40: Poster
Tuesday, August 31, 2021, 14:00–16:00, P
Transport Studies in ASDEX Upgrad via Gaspuff Modulation Experiments — •Christian Schuster1,2, Elisabeth Wolfrum1, Emiliano Fable1, Rainer Fischer1, Michael Griener1, Clemente Angioni1, Ulrich Stroth1,2, and ASDEX Upgrade Team1 — 1Max-Planck-Institut für Plasmaphysik, Garching — 2Physik-Department E28, Technische Universität München, Garching
To obtain sufficient fusion power in a future reactor, the core plasma has to be hot and dense. A large part of the radial density increase occurs at the edge of the plasma. Apart from the impact on fusion power the density profile also influences many different phenomena such as the L-H transition [Shao, PPCF 2016] or the achievable pedestal top pressure. The processes that determine the edge density profile are however still not understood sufficiently to be able to extrapolate to future devices.
Apart from particle transport, which we model by diffusion and a convection called pinch, fueling of the plasma by neutral atoms contributes to the density profile. The individual contributions cannot be distinguished by analyzing stationary profiles. We therefore modulate the gas flow and analyze the plasma response measured with various diagnostics in an integrated data approach. We find that the modulation, among other effects, causes a cold pulse whose propagation into the core can only be explained by time dependent transport models.