Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 5: Poster Session- Helmholtz Graduate School for Plasma Physics
P 5.1: Poster
Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof
Experimental investigation of interactions between ICRF wave fields and SOL plasma turbulence with B-dot, Langmuir, and MHD probes. — •Guillermo Suarez Lopez1, Roman Ochoukov1, Jean-Marie Noterdaeme1,3, Volodymyr Bobkov1, Helmut Faugel1, Helmut Fünfgelder1, and Hartmut Zohm1,2 — 1Max-Planck-Institut fürPlasmaphysik, 85748 Garching, Germany. — 2Ludwig Maximilians University of Munich, Germany — 3Ghent University, Belgium.
EM waves at the ion cyclotron range of frequencies (ICRF) are used successfully to heat magnetized fusion plasmas. In order to ensure good ICRF wave coupling, ICRF antennas must be placed close to the scrape-off layer (SOL) plasma. A series of toroidally distributed B-dot probes was installed on the LFS of the ASDEX Upgrade Tokamak in order to study ICRF wave fields (10-50 MHz). Initial results in ICRF heated H-mode plasmas, reveal a strong turbulent component which is thought to be due to plasma filaments. It is unclear, how much of this turbulent signal is generated by filaments in the vicinity of the probes, i.e. local turbulence, in comparison with turbulence generated at the ICRF active antennas which are further apart and would point to global turbulence. In order to decouple these spatial scales, several sets of Langmuir and MHD probes will be used. Langmuir probes detect local plasma density changes due to Edge Localized Modes (ELMs) and by magnetic field mapping, their signal can be correlated to the B-dot probes. On the other hand, MHD probes quantify global magnetic instabilities and will be used to support the analysis.