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P: Fachverband Plasmaphysik

P 11: Helmholtz Graduate School - Poster

P 11.30: Poster

Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal

Integrated modelling of tokamak plasma confinement combining core and edge pedestal physics — •Teobaldo Luda, Clemente Angioni, Mike Dunne, Emiliano Fable, Giovanni Tardini, Francois Ryter, and ASDEX Upgrade Team — Max-Planck-Institut für Plasmaphysik, Garching

A new theory-based approach to the integrated modelling of tokamak plasma confinement is being developed, which aims at predicting the total stored energy, and the plasma kinetic profiles, only using global plasma parameters of the discharge as inputs, such as the plasma current, the density and the heating powers. As a first step in the development of the model, we use the TGLF model to evaluate the turbulent transport fluxes in the core region, while in the pedestal region, transport is assumed to be purely neoclassical. With the transport code ASTRA, we investigate the applicability of the TGLF transport model to the plasma periphery, and how different assumptions on the pedestal transport affect the core, when the boundary conditions of the simulation are set at the last closed flux surface. We then check with the MISHKA MHD stability code that the heights and widths we are evaluating are consistent with the constraints imposed by peeling-ballooning modes. The long term goal is to obtain a robust model for the entire plasma which can be applied to large experimental databases, in order to identify important hidden dependencies affecting the global plasma confinement, which are difficult to capture by statistical regressions on global parameters.