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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.118: Poster

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

Carbon content studies with Charge Exchange Spectroscopy on W7-X — •Lilla Vanó, Oliver P. Ford, and Robert C. Wolf for the The Wendelstein 7-X Team collaboration — Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany

Apart from the main plasma species, impurities can enter the plasma from the surrounding walls and cause power loss by increasing plasma radiation. Understanding the transport of these ions can help us optimise the stellarator configuration to control impurities. The Wendelstein 7-X optimizied stellarator is equipped with a carbon divertor, making carbon the main impurity in the plasma.

The W7-X Charge Exchange Recombination Spectroscopy (CXRS) diagnostic is well-suited for investigating low-Z impurities, with the ability of giving spatially resolved information about them. Neutrals from the Neutral Beam Injection (NBI) transfer an electron to the fully-stripped ions in the plasma, the subsequent emission allows the characteristics of these ions to be examined. In this work, the first absolute impurity density measurements of the W7-X plasma core will be presented.

Various density profiles and their evolution showing different impurity confinement regimes will be presented. First comparisons with the STRAHL transport modeling code will also be included, with the future aim of constraining the v and D transport coefficients.