Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 17: Poster Session II
P 17.32: Poster
Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Plasma dynamics analysis with the fast helium beam at W7-X — •Sebastian Hörmann1,2, Michael Griener1, Maciej Krychowiak3, Dorothe Gradic3, Erik Flom3, Mohammad Foisal Siddiki3, Adrian von Stechow3, Carsten Killer3, Felix Reimold3, Stepan Sereda3, Ulrich Stroth1,2, the ASDEX Upgrade Team1, and the W7-X Team3 — 1Max-Planck-Institut für Plasmaphysik, 85748 Garching, Germany — 2Physik-Department E28, Technische Universität München, 85748 Garching, Germany — 3Max-Planck-Institut für Plasmaphysik, Greifswald 17491, Germany
Understanding and quantifying particle and energy transport at the plasma edge region is crucial for magnetic confinement fusion devices, as it determines plasma performance and wall loads. For the thermal helium beam systems in the island divertor of the stellarator W7-X, a new polychromator system with 1 MHz time resolution was installed, which is 25000 times faster than the existing system. This allows to measure and characterise turbulent structures, such as plasma edge modes and filaments and correlate their properties with plasma parameters. The diagnostic system measures within two magnetically connected divertors, which, in combination with the multi-purpose manipulator, enables the study of long-range correlation of modes. Utilising a collisional-radiative model, the diagnostic can measure fast density and temperature variations associated with plasma modes and filaments. It also provides high temporal resolution measurements of the detachment process in the divertor. This poster presents the design and implementation of the diagnostic and discusses the first results.
Keywords: magnetic confinement; stellarator; modes; correlation; helium beam