Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 17: Poster Session II
P 17.28: Poster
Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG
First measurements of divertor conditions in the new ASDEX Upgrade upper divertor — •Felix Albrecht1,2, Dominik Brida1, Tilmann Lunt1, Bernhard Sieglin1, Ou Pan1, and the ASDEX Upgrade team3 — 1Max Planck Institute for Plasma Physics, Garching, Germany — 2Technical University of Munich, Physics Department E28, Garching, Germany — 3see author list of H. Zohm et al. 2024 Nucl. Fusion 64 112001
The divertor is a crucial component for any magnetic confinement fusion machine, which enables efficient pumping of impurities and fusion-produced helium, as well as density and power exhaust control. In the divertor, the magnetic field lines of the outermost part of the plasma, the so-called Scrape-Off Layer (SOL), are intersected by a wall component, the divertor target, which experiences very high power loads. The target heat flux must be limited by the seeding of impurities, which radiate power away. However, a power plant divertor could require seeding rates which would be unacceptably high for the plasma core. A possible solution are Alternative Divertor Configurations (ADCs), which can help to induce detachment at lower impurity concentrations by enhanced control of the field configuration in the divertor region.
At the tokamak ASDEX Upgrade (AUG), the upper divertor has recently been equipped with additional coils to study a variety of ADCs, for the first time in a machine with high heating power and a tungsten wall. This contribution presents the first Langmuir probe measurements in the new upper divertor of AUG, and compares the divertor conditions between different field configurations.
Keywords: Divertor; Scrape-off layer; Alternative divertor configurations; Langmuir probes