Greifswald 2024 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 20: Magnetic Confinement VI
P 20.3: Vortrag
Donnerstag, 29. Februar 2024, 12:00–12:15, ELP 6: HS 3
Edge impurity behavior and plasma distribution after boronization on W7-X — •Pei Ren1,3, Yunfeng Liang1,3, Yu Luo1,3, Erhui Wang1, Stepan Sereda1,3, Ralph W.T. König2, Maciej Krychowiak2, Sebastijan Brezinsek1, Dorothea Gradic2, Marcin W. Jakubowski2, Petra Kornejew2, Olaf Neubauer1, Arun Panaey2, Shuai Xu1, and The w7-x Team1,2 — 1Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, 52425 Jülich, Germany — 2Max Planck Institute for Plasma Physics, 17491 Greifswald, Germany — 3Faculty of Mathematics and Natural Science, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany
Controlling the impurity source and wall particle re-cycling is necessary to achieve long-pulse high-performance steady-state plasma operation on the W7-X stellarator. In the experimental campaign OP1.2b, the passively cooled test divertor unit made of graphite has been used. The low-Z impurities, oxygen and the carbon, were identified as mostly contributing to the radiated power in the initial phase of OP1.2b. With the help of boronized wall conditions, a significant reduction in impurity concentration was observed by a newly installed divertor spectroscopy endoscope on W7-X. These results demonstrate the potential of boronization for edge plasma parameter optimization and control in upcoming high-power steady-state plasma operations. In this paper, the changes in impurity content and distribution in the divertor area, as well as the related changes in the edge plasma profiles (Te, ne) before and after boronization will be discussed.
Keywords: Boronization; spectroscopy endoscope system; impurity behavior