Hannover 2016 – scientific programme
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P: Fachverband Plasmaphysik
P 23: Helmholtz Graduate School for Plasma II
P 23.4: Fachvortrag
Thursday, March 3, 2016, 15:45–16:10, b302
Heavy ion transport in the core of ASDEX Upgrade — •Tomáš Odstrčil1,2, Thomas Pütterich1, Clemente Angioni1, Roberto Bilato1, Anja Gude1, Didier Mazon3, Didier Vezinet1, and ASDEX Upgrade Team1 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, D-85748 Garching, Germany — 2Physik-Department E28, Technische Universität München, 85747 Garching, Germany — 3CEA, IRFM F-13108 Saint Paul-lez-Durance, France
High impurity concentration in the core of the future fusion reactors can lead to the serious degradation of the achievable fusion gain. Therefore, a better understanding of the underlying impurity transport processes is necessary for higher performance, more efficient power exhaust and avoidance of impurity accumulation.
Radial impurity transport is mainly driven by neoclassical and turbulent particle fluxes. Both these components show substantial variation depending on the poloidal angle. Consequently, an asymmetry in the poloidal distribution of impurities leads to significant changes in the radial impurity flow and the total content of the plasma core.
The aim of this contribution is to experimentally verify a model describing the poloidal asymmetry of heavy impurities using measurements from ASDEX Upgrade. The observed asymmetries are caused mainly by the centrifugal force and poloidal electric force created by the fast particles produced by intensive ion-cyclotron heating. Finally, a change in the radial transport of the tungsten ions will be presented in the case of large inboard and outboard impurity accumulation.