Bochum 2015 – wissenschaftliches Programm
P 16.9: Poster
Dienstag, 3. März 2015, 16:30–18:30, Foyer Audimax
Poloidal asymmetries of the heavy ions in the ASDEX Upgrade tokamak — Tomáš Odstrčil1,2, Thomas Pütterich1, Didier Mazon3, Clemente Angioni1, Roberto Bilato1, Anja Gude1, 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
Poloidal asymmetries of heavy ions in the tokamak plasma are caused by the presence of forces parallel with field-lines which have comparable magnitude to the thermal pressure. The most important examples are the centrifugal force (CF) and the electric force (EF). The CF is caused by fast toroidal rotation of the plasma column which is pushing impurity ions, that have a substantially higher mass than the main ions, on the outer-side of the plasma. And the EF can be produced by ion cyclotron heated fast particles with high pitch angle that are trapped by the mirror force on the low field side of the plasma. The excessive charge produced by these particles is affecting highly charged impurities and pushing them to the high field side of the plasma.
From predictions based on neoclassical and turbulent theory, it follows that the radial flux of heavy ions will be significantly changed by the presence of these asymmetries. The purpose of this study is to investigate the presence of these asymmetries in ASDEX Upgrade and verify the predicted consequences on the particles flux.