Bochum 2015 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 16: Poster Session - Helmholtz Graduate School for Plasma Physics

P 16.15: Poster

Dienstag, 3. März 2015, 16:30–18:30, Foyer Audimax

Indirect measurement of the poloidal velocity using charge exchange recombination spectroscopy — •Alexander Lebschy1,2, Benedikt Geiger1, Rachael McDermott1, Marco Cavedon1, Mike G. Dunne1, Rainer Fischer1, Eleonora Viezzer1, and the ASDEX Upgrade Team11Max-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 plasma transport by the stabilization of modes and the suppression of plasma turbulence, which affects the transport of heat, particles, and momentum. In tokamaks, the toroidal rotation 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, on the other hand, is strongly damped and is expected to remain at neoclassical levels. A commonly used diagnostic to measure impurity ion rotation as well as temperature and density is charge exchange recombination spectroscopy. Measuring the inboard-outboard asymmetry of the toroidal rotation enables an indirect measurement of the poloidal rotation so that both, poloidal and toroidal rotation, can be measured with toroidal viewing chords. Additional benefits of this technique are that poloidal velocities are amplified with the safety factor and that the technique is less sensitive to atomic physics effects like the gyro motion. In this poster, first reconstructions of the poloidal rotation are shown and compared to neoclassical theory and to other direct measurements.

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