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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.95: Poster
Thursday, March 19, 2026, 13:45–15:45, Redoutensaal
Preliminary study of boronization effect on divertor density regime in the standard configuration on W7-X — •Muzhi Tan1,2, Shuai Xu1, Yunfeng Liang1,2, Yu Luo1,2, Pei Ren1,2, Yuhe Feng3, Detlev Reiter1, Daihong Zhang3, Arun Pandey3, and Golo Fucher3 for the w7-x team collaboration — 1Forschungszentrum Jülich GmbH, IFN-1 Plasma Physics, Jülich, Germany — 2HHU Düsseldorf, Faculty of Mathematics and Natural Sciences, Düsseldorf, Germany — 3Max-Planck-Institute für Plasmaphysik, Greifswald, Germany
Boronization is widely applied in magnetic confinement devices to sustain high-performance, steady-state plasma operation. In this work, we present a preliminary study of the boronization effect on divertor density regimes by comparing two density-ramp discharges with identical ECRH heating power (3 MW). Experimental observations show that boronization significantly suppresses intrinsic oxygen impurity sources. Before boronization, the downstream ion saturation current (Isat) increases slightly with rising radiated power; after boronization it rises much more rapidly and exhibits a clear roll-over when the radiation fraction exceeds 50%. Motivated by these experimental trends, EMC3-EIRENE simulations were performed to assess the impact of boronization on divertor density regimes. By comparing impurity transport at the same radiated power, simulations illustrate how oxygen influences the transition of divertor density regime. Simulations without oxygen impurities reproduce the Isat roll-over and highlight the beneficial role of boronization on modifying transport in W7-X.
Keywords: Boronization; Divertor density regime; Island divertor; EMC3-EIRENE