Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 5: Poster Session- Helmholtz Graduate School for Plasma Physics
P 5.26: Poster
Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof
Characterisation of the core poloidal flow at ASDEX Upgrade — •Alexander Lebschy1,2, Rachael M. McDermott1, Benedikt Geiger1, Marco Cavedon1, Michael G. Dunne1, Ralph Dux1, Rainer Fischer1, Athina Kappatou1, Patrick J. McCarthy1, Eleonora Viezzer1, and the ASDEX Upgrade Team1 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, D-85748 Garching, Germany — 2Physik-Department E28, Technische Universität München, D-85748 Garching, Germany
Plasma rotation has a strong influence on the transport of heat, particles, and momentum in fusion plasmas via a variety of mechanisms, for example, by the stabilization of modes and the suppression of plasma turbulence. In tokamaks, the toroidal rotation (utor) is essentially a free parameter that is usually dominated by the external momentum input from neutral beams used to heat the plasma. The poloidal rotation (upol), on the other hand, is strongly damped and is predicted to remain at Neoclassical (NC) levels of a few km/s. Measuring the inboard-outboard asymmetry of utor with charge exchange recombination spectroscopy enables an indirect measurement of upol and, hence, the measurement of the complete plasma flow on a flux surface.
In order to characterise the nature of upol at ASDEX Upgrade a poloidal rotation database has been built that contains a large variation in the parameters that, according to NC theory, drive upol; namely, the main ion temperature and density gradients and collisionality. Initial results from this database and a detailed comparison of upol to NC theory in interesting plasma scenarios, will be presented in this poster.