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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.71: Poster
Thursday, March 19, 2026, 13:45–15:45, Redoutensaal
Statistical Analysis of Plasmoid Properties from Pellet Injections in Wendelstein 7-X — •Edgardo Villalobos Granados1, Jügen Baldzuhn1, Naoki Tamura1, Ameer Mohammed2, Larry Baylor3, and Nerea Panadero4 — 1Max Planck Institute for Plasma Physics, Greifswald, MV, Germany — 2Princeton Plasma Physics Laboratory, Princeton, New Jersey, United States — 3Oak Ridge National Laboratory, Oak Ridge, TN, USA — 4Laboratorio Nacional de Fusión, CIEMAT, Madrid, Spain
Hydrogen pellet injection is essential for core fueling in magnetic confinement fusion devices, such as stellarators. In particular, the Wendelstein 7-X (W7-X) stellarator aims to achieve steady state operation and demonstrate long pulse operation at high performance, which includes continuous particle fueling with the use of cryogenic hydrogen pellets. Understanding the dynamics of pellet ablation and the resulting plasmoid characteristics is a fundamental step for optimizing fueling strategies and improving plasma confinement. A statistical analysis of plasmoid properties generated during pellet injection in the W7-X. Plasmoid properties were inferred from visible range spectroscopic measurements of the hydrogen Balmer series. A dataset of over 2000 pellet injections across multiple magnetic configurations was analyzed to extract statistical distributions of plasmoid temperatures (typically 1-2 eV), densities on the order of 1e24 m-3, and corresponding pressure. The correlation between these properties and pellet and background plasma conditions was investigated. These results provide important experimental constraints for modeling pellet-plasma interactions
Keywords: W7-X; fuelling; pellets; spectroscopy