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P: Fachverband Plasmaphysik
P 18: Helmholtz Graduate School HEPP IV
P 18.2: Vortrag
Donnerstag, 31. März 2022, 14:25–14:50, P-H12
Edge Transport and Fuelling Studies via Gas Puff Modulation in ASDEX Upgrade — •Christian U. Schuster1,2, Elisabeth Wolfrum1, Emiliano Fable1, Rainer Fischer1, Michael Griener1, Balazs Tal1, Clemente Angioni1, Thomas Eich1, Peter Manz3, Ulrich Stroth1,2, and the ASDEX Upgrade Team1 — 1Max-Planck-Institut für Plasmaphysik, Garching — 2Physikdepartment E28, Technische Universität München, Garching — 3Institut für Physik Universität Greifswald, Greifswald
In a tokamak the edge profiles of temperature and density are crucial for a multitude of aspects such as the L-H transition, the achievable pedestal top pressure, or the achieved fusion power itself. The processes that determine these profiles are transport on one hand and sources on the other. Especially for the density profile these processes are not sufficiently understood to predict profiles for future devices.
To characterize the edge transport in a quantitative way, we modulate the fuelling gas flow to perturb the plasma. We then use the transport code ASTRA as forward model and several diagnostics in an integrated data approach. This allows us to determine various quantities, depending on the available experimental data and the quality thereof. In particular we find particle transport coefficients, fuelling properties, and correlations of transport to other quantities. The transport coefficients are not constant in time: already slight perturbations of the plasma alter them, especially just inside the separatrix. We present results for various plasma scenarios ranging from L-modes to H-modes with and without large ELMs.