Kiel 2011 – scientific programme

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P: Fachverband Plasmaphysik

P 19: Poster: Hochtemperaturplasmen: Experiment und Diagnostik

P 19.3: Poster

Wednesday, March 30, 2011, 16:30–18:30, Foyer

Validation of transport models in ASDEX Upgrade current ramps — •Sina Fietz, Jörg Hobirk, Emiliano Fable, Rainer Fischer, Christoph Fuchs, Grigori Pereverzev, Francois Ryter, and the ASDEX Upgrade Team — Max Plank Institut für Plasmaphysik, EURATOM Association, D-85748 Garching, Germany

In order to prepare adequate ramp up and down scenarios for ITER, understanding the physics of transport during the current ramps is essential. The aim of the work was to assess the capability of several transport models to reproduce the experimental data during the current ramps. For this purpose, the calculated temperature profiles from different transport models, i.e. Coppi-Tang, Neo-Alcator, Bohm-Gyrobohm, critical gradient model and H98/2 scaling-based are compared to experimental temperature profiles under different conditions. The strong variation of the experimental electron temperature profiles are partly reproduced by the models, as will be discussed. The importance of central and edge radiation will be emphasized, as well as the main transport properties of the models, especially in the case of strong local electron heating (ECRH). To investigate the control capabilities of a Tokamak, particularly with regard to ITER, the impact on global plasma parameters like the internal inductance and the stored energy is also investigated.