Göttingen 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
P: Fachverband Plasmaphysik
P 17: Poster Session II
P 17.30: Poster
Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Turbulence imaging in the scrape-off layer of Wendelstein 7-X — •Floris Scharmer1, Adrian von Stechow1, Sean Ballinger2, Seung-Gyou Baek2, James Terry2, Carsten Killer1, Olaf Grulke1,3, and the W7-X Team1,4 — 1Max Planck Institute for Plasma Physics, Greifswald, Germany — 2MIT Plasma Science and Fusion Center, Cambridge, USA — 3Department of Physics, Technical University of Denmark, Lyngby, Denmark — 4See O. Grulke et al 2024 Nucl. Fusion 64 112002
Understanding the dynamics of the edge plasma is crucial for magnetic confinement fusion experiments, as it significantly impacts both core performance and plasma exhaust. In the Wendelstein 7-X stellarator experiment, a 2D poloidal cross section of the island scrape-off layer plasma is imaged with a gas puff imaging diagnostic. This system measures the fluctuations in Hα line emission, a proxy for plasma fluctuations, at a high spatio-temporal resolution by increasing the local light emission with an external neutral gas puff. In the latest operation phase (2024), the diagnostic capabilities were upgraded with the ability to use a high-resolution camera, which can be swapped with the existing avalanche photodiode detector array as needed. This enhancement allows for the study of turbulence statistics with higher spatial resolution and over a larger field of view, including the last closed flux surface. The turbulence statistics (e.g. skewness) have distinct features corresponding to the magnetic geometry and also depend on the operational regime. In this contribution, the results of the first measurements of the diagnostic extension are presented.
Keywords: turbulence; gas puff imaging; scrape-off layer; Wendelstein 7-X