Erlangen 2026 – scientific programme

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P: Fachverband Plasmaphysik

P 16: Poster Session Plasma Physics

P 16.73: Poster

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

Observed toroidal radiated power variations in Wendelstein 7-X — •Anastasios Tsikouras¹, Felix Reimold¹, Gabriele Partesotti¹, Kevin Andrea Siever¹, Takashi Nishizawa², Maciej Krychowiak¹, and Daihong Zhang¹ — ¹Max Planck Institute for Plasma Physics, Greifswald, Germany — ²Kyushu University, Kasuga, Japan

An accurate total radiated power (P_rad) proxy is important for the efficient and safe operation of a nuclear fusion device. Specifically in 3D devices such as the Wendelstein 7-X stellarator (W7-X), the P_rad distribution varies toroidally [1]. This poses a challenge in precise calculation the total P_rad. Although shown with synthetic data [1], the distribution of the radiation needs to be validated experimentally. This contribution presents the observed asymmetries on different P_rad proxies from different bolometer systems in W7-X. Data from different cross-sections reveal up to 8-fold increase in toroidal asymmetries for low plasma densities. The effect reduces with the increase in the density. For higher input powers the asymmetry increases. Furthermore, configurations with higher field line pitch and reduced plasma wall interaction exhibit a decrease in the asymmetries. In seeded cases, the asymmetries decrease with the increase in the fraction of radiated power which is directly linked with the impurity content in the machine. These results support the formulation of a more precise P_rad proxy.

[1] G. Partesotti, PhD thesis (Greifswald 2025)

Keywords: Radiated power; Asymmetries; Stellarator; W7-X