Erlangen 2026 – scientific programme

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P: Fachverband Plasmaphysik

P 16: Poster Session Plasma Physics

P 16.101: Poster

Thursday, March 19, 2026, 13:45–15:45, Redoutensaal

Quantification of tungsten content in Wendelstein 7-X — •Birger Buttenschön, Daihong Zhang, Christian Brandt, Felix Reimold, and W7-X Team — Max Planck Institute for Plasma Physics, Greifswald, Germany

The high-Z material tungsten (W) is one of the most promising candidates for the use as first wall material in magnetic confinement fusion devices. Its capability to bear high particle and energy loads makes it ideal for the first wall. However, plasma-wall interaction can release W into the confined plasma, where even small impurity concentrations give rise to significant radiative power losses. Especially in a stellarator, which tends to accumulate impurities in relevant scenarios, the knowledge of tungsten sources and transport and the control of total tungsten concentration is crucial for reliable high performance operation.

In this contribution, we present our current knowledge about the W content in Wendelstein 7-X (W7-X) plasmas. The evaluation comprises deliberate impurity injections, interpretation of the radiation structures observed by bolometry and x-ray tomography, and finally an estimate of the background intrinsic tungsten concentration during standard W7-X operation.

Keywords: plasma; stellarator; impurities; tungsten; spectroscopy