Göttingen 2025 – wissenschaftliches Programm
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SYSF: Symposium Turbulence in Space and Fusion Plasmas
SYSF 1: Turbulence in Space and Fusion Plasmas
SYSF 1.1: Hauptvortrag
Mittwoch, 2. April 2025, 14:00–14:30, ZHG101
Addressing turbulence questions in the Wendelstein 7-X stellarator device - a combined experimental and theoretical approach — •Josefine Proll1,2, Paul Mulholland2, MJ Pueschel2,3, Maikel Morren2, Gavin Weir1, Ksenia Aleynikova1, Adrian von Stechow1, Pavlos Xanthopoulos1, Gabriel Plunk1, and the W7-X Team1 — 1Max Planck Institute for Plasma Physics, Greifswald, Germany — 2Eindhoven University of Technology, Eindhoven, The Netherlands — 3DIFFER, Eindhoven, The Netherlands
With the advent of stellarators optimised for low collisional transport such as Wendelstein 7-X (W7-X), turbulence has become one of the main obstacles to a working fusion reactor. Tapping into the free energy of gradients in density and temperature, turbulence will cause outward transport of heat and particles and severely limit the achievable core density and temperature and thus the reactor performance. With W7-X, we can directly probe turbulence in the flexible magnetic geometry and compare against state-of-the-art gyrokinetic codes. In this talk, I will present recent findings on electrostatic and electromagnetic turbulence in W7-X, e.g. how, at much lower normalised plasma pressure beta than previously anticipated, kinetic ballooning modes appearing below the MHD threshold can lead to an increase in ITG turbulence or that heat-pulse propagation experiments confirm rather benign transport caused by electron-temperature gradient modes. I will close with an outlook of unanswered questions both from theory and experiment and how we plan to address them on W7-X.
Keywords: turbulence; stellarators; magnetic confinement fusion; gyrokinetics