Erlangen 2026 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 14: Magnetic Confinement V
P 14.1: Vortrag
Donnerstag, 19. März 2026, 11:00–11:25, KH 02.016
Understanding the impact of the divertor configuration on the L-H transition in the ASDEX Upgrade tokamak — •Roxána Takács1, Michael Dunne1, Gregor Birkenmeier1, Matthias Willensdorfer1, and the ASDEX Upgrade Team2 — 1Max Planck Institute for Plasma Physics, Garching, Germany — 2See author list of H. Zohm et al, 2024 Nuclear Fusion
Future fusion devices, such as ITER, will operate in high-confinement mode (H-mode) to achieve the plasma confinement required for sustained energy production. H-mode is characterized by increased stored energy and the formation of a steep pressure gradient at the plasma edge. In the leading interpretation, the transition into H-mode occurs when the E×B shear becomes strong enough to suppress edge turbulence. Previous studies from many major tokamaks have shown that the power threshold for the L−H transition (PLH) depends on various parameters, including the main isotope, plasma shape, and plasma density. This study investigates how the PLH varies with different divertor configurations in the ASDEX Upgrade tokamak. The experimental dataset consists of lower- and upper single null plasma discharges, in low and high density regimes, with different divertor configurations. Significant variations in PLH are observed across the different divertor configurations. This work presents an analysis of the divertor conditions as well as kinetic profiles at the midplane which aids in understanding the underlying physics of the L−H transition and improving our ability to optimize H-mode access in future fusion reactors.
Keywords: L-H transition; Divertor configuration; Tokamak