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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.96: Poster
Thursday, March 19, 2026, 13:45–15:45, Redoutensaal
First L-Mode experiments in Alternative Divertor Configurations in ASDEX Upgrade — •Felix Albrecht1,2, Dominik Brida1, Ou Pan1, Tilmann Lunt1, Michael Faitsch1, Bernhard Sieglin1, and ASDEX Upgrade Team3 — 1Max Planck Institute for Plasma Physics, Garching, Germany — 2Technical University of Munich, Physics Department, Garching, Germany — 3see author list of H. Zohm et al. 2024 Nucl. Fusion 64 112001
All fusion devices need to exhaust the plasma heating power in a separate region from the core plasma called the divertor. There, most of the heat flux must be radiated away through plasma-neutral interactions, typically by seeded impurities, to protect the divertor target plates. If the impurity concentration is high enough, a favorable state of detachment can be reached, where the plasma recombines in front of the target. However, the required impurity concentrations might be too high for good core performance. Recent hardware upgrades in the tokamak ASDEX Upgrade enable access to alternative divertor configurations (ADCs), a possible solution to facilitate detachment with less impurities. Through increased flux expansion at the target (X-divertor, XD) or the introduction of another X-point in the divertor plasma (snowflake minus, SF−), ADCs have been shown in other machines to be favorable for detachment [Theiler NF 2017].
We present the first L-Mode experiments in ASDEX Upgrade with ADCs. In XD and SF−, an earlier detachment of the primary strikepoint compared to single null was found. The results are interpreted with the plasma and neutral transport code SOLPS-ITER.
Keywords: Divertor; Scrape-off layer; Alternative divertor configurations; Detachment; SOLPS-ITER