Erlangen 2026 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.80: Poster
Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal
Analysis on the plasma edge fluctuations in the X-point radiator regime in ASDEX Upgrade — •Yu-Chih Liang1,2, Ou Pan1, Matthias Bernert1, Tim Happel1, Ulrich Stroth1,2, Gustavo Grenfell1, Sebastian Hörmann1, Alessandro Mancini1, Konrad Eder1, Mate Szuecs1,2,3, and the ASDEX Upgrade Team1 — 1Max Planck Institute for Plasma Physics, 85748 Garching, Germany — 2TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany — 3ITER Organization, 13067 St. Paul Lez Durance Cedex, France
The power exhaust problem in large-scale fusion reactors necessitates operational regimes that can avoid extreme heat fluxes onto the plasma-facing components. One promising regime is the X-point radiator (XPR), featuring a highly radiative plasma volume forming above the X-point. Additionally, suppression of edge localized modes (ELMs) can be achieved when the XPR moves inside the confined region.
This contribution focuses on the plasma edge, where the complexity arises from the turbulence around the XPR volume, the interactions between the edge modes and the XPR, and the influence of the XPR on the edge turbulence transport. Using the thermal He beam diagnostics, the diode bolometry, and the magnetic coils in ASDEX Upgrade, the edge fluctuations in the XPR regimes both with and without large ELMs are studied. Furthermore, the presented analysis on the fluctuation measurements is extended from the outer midplane to the XPR volume, aiming to improve understanding on the interactions between the outer midplane plasma profile and the XPR.
Keywords: X-point radiator; Plasma edge; Turbulence; Detached regime; ELM suppression