München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.82: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

Spectroscopic observation of oxygen, carbon and boron before and after boronization in W7-X — •Stepan Sereda1, Sebastijan Brezinsek1, Erhui Wang1, Maciej Krychowiak2, Marcin Jakubowski2, Ralf König2, Yunfeng Liang1, Tullio Barbui3, Bernd Schweer1, Guruparan Satheeswaran1, Horst Lambertz1, Rahim Allahyari1, Victoria Winters3, Mathias Schülke2, Yanling Wei4, and Olaf Neubauer1 for the The Wendelstein 7-X Team collaboration — 1Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung, Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), Jülich, Germany — 2Max-Planck-Institut für Plasmaphysik, Greifswald, Germany — 3University of Wisconsin-Madison, Madison, USA — 4Southwestern Institute of Physics, Chengdu, China

The low-z elements oxygen and carbon were the main impurities in W7-X plasma. After boronization a significant decrease of oxygen and carbon reduced the radiative-induced density limit. Line emission of these two elements together with a newly arisen boron were studied with a help of spectroscopy to characterize impurity flux in the divertor region before and after boronization. Particularly, an overview spectrometer with a wide wavelength range (300 nm - 1100 nm) was used to simultaneously observe all lines of interest. In addition, cameras with narrowband interference filters together with the divertor gas injection system were used to derive a 2D emission profiles of injected He to investigate Te and ne profiles.

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