Erlangen 2026 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.89: Poster
Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal
Core neutral density measurements from Balmer-α emission at Wendelstein 7-X — •Lucas Nitzsche1, Sebastian Bannmann1, Oliver Ford1, Felix Reimold1, and Robert Wolf1,2 for the w7-x team collaboration — 1Max Planck Institute for Plasma Physics, 17491 Greifswald, Germany — 2Technical University of Berlin, Strasse des 17.Juni 135, 10623 Berlin, Germany
Wendelstein 7-X (W7-X) is a current state-of-the-art magnetic confinement fusion device of the stellarator type.
It was shown at W7-X, that the energy confinement time of its plasmas depends strongly on their density profile shape. This in turn is linked directly to controlling and knowing the particle-transport. Although the particle fueling of recycling neutrals into the confined region is an important quantity in corresponding calculations, it is not routinely measured and must be approximated by simplified modeling. Accessing this particle fueling is possible by measuring the density of neutral particles n0 inside the plasma and combining it with ionization rates.
In this work, passive Balmer-α emissions from the confined region are analysed to estimate n0-profiles along each measured line-of-sight (LOS). The previous modeling of the emissions was improved by including charge-exchange-reactions in the emission coefficients. From the evaluations, the n0-distributions inside W7-X plasmas were estimated and compared to modeling with EMC3-EIRENE. Results are compared for two spectrometers at different toroidal positions at W7-X.
Keywords: Magnetic confinement fusion; Wendelstein 7-X; diagnostics; neutral densities; spectroscopy