Erlangen 2026 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.15: Poster
Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal
Simulations and experiments of early-heating reversed-shear discharges — •Lea Hollendonner1, Alexander Bock1, Thomas Pütterich1, Jörg Stober1, Jörg Hobirk1, and the ASDEX Upgrade Team2 — 1Max Planck Institute for Plasma Physics, Garching, Germany — 2See author list of H. Zohm et al 2024 Nucl. Fusion 64 112001
Negative magnetic shear can lead to the suppression of microinstabilities and the formation of internal transport barriers (ITBs). These scenarios hold the potential of improved core confinement and high bootstrap-current fraction but may also lead to impurity accumulation in the core. In order to make predictions based on these scenarios, codes like TGLF must be able to capture the effects of negative shear on transport and quantitatively match experimental profiles in this regime. A prerequisite for these investigations is to achieve stable, distinct regions of negative shear in experiments, and to measure the q-profile with sufficient accuracy. The focus of this poster lies on the early-heating approach which slows down current diffusion of inductive current from the edge to the core region during the ramp-up phase of the discharge. Experiments of early-heating are presented that employ central counter-current ECCD during ramp-up. Based on these discharges, the timing and deposition of ECCD as well as the plasma current ramp is varied in simulations in order to investigate the effects of these actuators on the q-profile evolution.
Keywords: Advanced Scenarios; Internal Transport Barriers; Scenario Development