Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 7: Magnetic Confinement I
P 7.3: Vortrag
Dienstag, 1. März 2016, 11:55–12:10, b305
Poloidal asymmetric flow and current perturbations during I-phase in ASDEX Upgrade — •P. Manz1,2, G. Birkenmeier1,2, G. Fuchert2, M. Cavedon2, G.D. Conway2, F. Mink2, B.D Scott2, U. Stroth2,1, and the ASDEX Upgrade Team2 — 1Physik-Department E28, Technische Universität München, 85748 Garching, Germany — 2Max-Planck-Institut für Plasmaphysik, 85748 Garching, Germany
At the transition from low confinement to high confinement regimes in magnetically confined plasmas regular pulsations occur, this regime is called the I-phase. During the I-phase in ASDEX Upgrade up-down asymmetric parallel current fluctuations are observed. A detailed investigation of the interplay of perturbations in different fields with different poloidal asymmetry reveals that the observed current fluctuations are not responses to the equilibrium, but can be interpreted as a response to strongly ballooned plasma transport. Furthermore they are also intrinsically coupled with the Stringer spin-up. A good agreement of the experimental measured limit-cycle frequencies during I-phase with the Stringer spin-up relaxation frequency is found.