Göttingen 2025 – scientific programme
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P: Fachverband Plasmaphysik
P 10: Poster Session I
P 10.45: Poster
Tuesday, April 1, 2025, 16:15–18:15, ZHG Foyer 1. OG
Bayesian inference of plasma parameters in the island divertor of W7-X — •Linnéa Björk1, Felix Reimold1, Sehyun Kwak1, Daniel Böckenhoff1, Udo von Toussaint2, Sebastian Grosinger3, and The Wendelstein 7-X Team1 — 1Max Planck Institute for Plasma Physics, Greifswald, Germany — 2Max Planck Institute for Plasma Physics, Garching, Germany — 3Lund University, Department of Physics, Lund, Sweden
The W7-X stellarator is a 3D fusion device with a complex geometry, which make diagnostic measurements of the plasma sparse. This is especially true for the boundary region, known as the scrape-off layer (SOL). Here so-called island divertors are located which manage exhaust for particles and heat. In this region, the plasma interacts with toroidally discontinuous divertor plates, which can lead to strongly toroidally localized effects. Assessing the physics and transport phenomena in this region is therefore not trivial. By using a Bayesian analysis approach, datasets from different diagnostics can be combined in order to obtain information about the underlying plasma parameters, such as the electron density and temperature distributions. This knowledge will ultimately help deepen the understanding of transport at the boundary.
In this contribution, first steps into a Bayesian analysis framework focusing on inference of plasma parameters in the boundary region will be presented. This includes outlier-robust 1D profile fits of electron density and temperature and progress on building a 2D framework for parameter regression.
Keywords: Stellarator; Transport; Bayesian analysis