Erlangen 2018 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 11: Helmholtz Graduate School - Poster

P 11.32: Poster

Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal

Impurity studies with Charge Exchange Spectroscopy on W7-X — •Lilla Vanó, Juergen Baldzuhn, Oliver Ford, Robert C Wolf, and the W7-X team — Max-Planck-Institute for Plasma Physics, Greifswald, Germany

Wendelstein 7-X (W7-X) is an optimized stellarator with the goal of demonstrating the stellarator as a promising candidate for a future fusion power plant. Apart from the main plasma species, hydrogen, impurities 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 reduce impurities.

There are several diagnostics that investigate impurity transport, one of them is the Charge Exchange Recombination Spectroscopy (CXRS). On W7-X, neutrals from the Neutral Beam Injection (NBI) will transfer an electron to the fully-stripped low-Z ions in the plasma (e.g. carbon). This allows the characteristics of these ions to be examined. Until the NBI is available, the emission of the passively excited low-Z ions near the plasma edge can also be measured but with lower intensity and as line integrated measurements.

In this work, data from the passive system is analyzed, delivering the temperature profile and the distribution of the Carbon-VI ions. These results will provide information about the primary plasma impurity in the first W7-X campaign with a fully carbon divertor.