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P: Fachverband Plasmaphysik
P 9: Poster I
P 9.25: Poster
Dienstag, 29. März 2022, 16:00–17:30, P
Edge core coupling: physical parameters determining the pedestal width — •Lidija Radovanovic1, Mike Dunne2, Elisabeth Wolfrum2, Friedrich Aumayr1, and ASDEX Upgrade Team2 — 1Institute for Applied Physics, TU Wien, Vienna, Austria — 2Max Planck Institute for Plasma Physics, Garching, Germany
The outer edge of the plasma, also called the pedestal, serves as a strong insulator between the plasma core and the reactor walls. The top of the pedestal serves as a boundary condition for the hot core plasma. Understanding the physical processes governing the pedestal is crucial for reliable prediction and control of the plasma conditions and its stability. Using the EPED framework as a basis, the pedestal can be considered as a combination of two limits: the pedestal width grows at a constant gradient to the ideal peeling ballooning limit. Understanding this width growth is crucial in order to accurately predict the pedestal for future machines. In this work the pedestal width is further investigated in experiments based on two methods. The first considers a recent analysis at the ASDEX Upgrade, which indicates that locally low magnetic shear at the pedestal top could cause ballooning modes, and it therefore limits the pedestal width. The experimental approach here is changing the shape and the magnetic field of the plasma to move the region of low local magnetic shear. The second method assumes that the turbulent motion of the ionized particles in the plasma edge region is suppressed due to the presence of a steep radial electric field. A comparison of these assumptions with the pedestal width will be shown.