Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 17: Poster Session II
P 17.16: Poster
Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Characteristics of the SOL ion-to-electron temperature ratio on W7-X with an island divertor configuration — •Jiankun Hua1,2, Yunfeng Liang1,2,3, Alexander Knieps2, Kaixuan Ye2,3, Carsten Killer4, Erhui Wang2, and Pei Ren2 — 1International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, Huazhong University of Science and Technology, Wuhan, China — 2Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung Plasmaphysik, Jülich, Germany — 3Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China — 4Max-Planck-Institut für Plasmaphysik, Greifswald, Germany
The ion temperature, Ti, in the scrape-off layer (SOL) plays a critical role in understanding diverter plasma transport in magnetic confined fusion research. Previous studies have shown SOL Ti is typically higher than the electron temperature, Te. Moreover, as the ion collisionality (υ) increases, the ion-to-electron temperature ratio (τ) decrease accordingly. Experiments in the W7-X device, which employs an island divertor configuration, are consistent with earlier observations made in tokamaks. However, the Ti profile is non-monotonic due to the influence of the open magnetic island structure in SOL. Ti inside the island is lower than at the island boundary. When SOL plasma transitions from an attached state to a detached state by ramping up upstream plasma density, the υ increases, and both Ti and Te decrease in the SOL. Meanwhile, the relation between τ and υ remains consistent with the attached plasma, so the τ further decrease under the detachment.
Keywords: SOL; the ion-to-electron temperature ratio; island divertor; detachment