Düsseldorf 2007 – scientific programme

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P: Fachverband Plasmaphysik

P 14: Magnetischer Einschluss

P 14.4: Talk

Wednesday, March 21, 2007, 15:20–15:35, 6B

The Role of Magneto-Hydrodynamic Instabilities in the Improved H-Mode Scenario — •Asher Flaws, Anja Gude, Valentin Igochine, Costanza Maggi, Marc Maraschek, and Hartmut Zohm — Max-Planck-Institut fuer Plasma Physik, Garching, Euratom Association, Germany

A database of magneto-hydrodynamic (MHD) instabilities in the improved H-mode scenario on ASDEX Upgrade has been compiled. The database comprises of MHD parameter time series for some 75 improved H-mode shots. Poloidal/toroidal wave-numbers; mode amplitude, and frequency progression have been tracked for the Neo-classical Tearing Mode (NTM), Frequently Interrupted Regime NTM (FIR-NTM), Fishbone, and Sawtooth instabilities. Additionally, a study of selected time slices provides a statistical overview of the presence/absence of each MHD type versus various plasma parameters, such as heating power, confinement, core temperature, etc. The goal of this database is to provide insight into the role of MHD in improving/degrading confinement, establishing the q-profile, and to find the range of plasma parameters in which these MHD exist, along with their onset/termination conditions.