Hannover 2016 – scientific programme
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P: Fachverband Plasmaphysik
P 5: Poster Session- Helmholtz Graduate School for Plasma Physics
P 5.9: Poster
Monday, February 29, 2016, 16:30–19:00, Empore Lichthof
Mode number determination of ELM associated phenomena by improved phase fitting of magnetic pick-up coils — •Felician Mink1,2, Elisabeth Wolfrum1, Florian Laggner1, László Horváth3, Ulrich Stroth1,2, and The ASDEX Upgrade Team3 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany — 2Physik Department, E28, TUM, 85748 Garching, Germany — 3Budapest University, Pf 91, H-1521 Budapest, Hungary
Edge localized modes (ELMs) occur as repetitive bursts of magnetohydrodynamic (MHD) activity in high-confinement regimes of tokamak fusion plasmas. As ELMs lead to a sudden release of pedestal stored energy they might cause intolerable high heat fluxes onto the divertor target plates in future fusion devices like ITER. Therefore, it is necessary to get a better understanding of ELM triggering mechanism.
It has been reported from different tokamaks that during the inter-ELM phase mode-like MHD activities that might play an important role for the ELM onset can be observed with defined toroidal mode numbers.
Here the method of determining the toroidal mode numbers of such coherent fluctuations on ASDEX Upgrade from magnetic pick-up coils is reviewed. A significant improvement of the determination of the mode numbers is achieved by ELM-synchronization and consideration of intrinsic coil phases. First results for mode numbers of ASDEX Upgrade inter-ELM oscillations and their connection to kinetic profiles are given.