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P: Fachverband Plasmaphysik
P 12: Poster II
P 12.25: Poster
Mittwoch, 22. März 2023, 17:30–19:00, HSZ EG
Influence of Radial Electric Field and Ideal Ballooning Stability on the Pedestal Width — •Lidija Radovanovic1, Elisabeth Wolfrum2, Mike Dunne2, Marco Cavedon3, Georg Harrer1, Friedrich Aumayr1, and ASDEX Upgrade Team4 — 1Institute of Applied Physics, TU Wien, 1040 Vienna, Austria — 2Max Planck Institute for Plasma Physics, 85748 Garching, Germany — 3Universit`a di Milano-Bicocca, 20126 Milano, Italy — 4see author list of U. Stroth et al. 2022 Nucl. Fusion 62 042006
Understanding the physical processes which govern the pedestal is crucial for reliable prediction and control of the plasma conditions and for its stability. The first experimental method investigates if the ideal ballooning modes at the pedestal top could cause additional transport and limit the pedestal width. A variation in the plasma stability is achieved by modifying the shape of the plasma. Increasing the triangularity of the plasma widens the electron pressure pedestal at a fixed gradient, which correlates with the minimum ballooning stability. The second method assumes that the turbulence in the plasma edge is suppressed due to the presence of a critical shear flow originating from radial electric field gradients. The radial electric field is varied by changing the density in discharges which use different heating systems to achieve the same total power, but which apply a different amount of torque to the plasma. It is shown that the electron density changes with shaping and the ion temperature with torque of heating method. Therefore it seems as if there is no clear actuator for the pedestal width, but each component is influenced individually by different physical processes.