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P: Fachverband Plasmaphysik
P 3: Magnetic Confinement II
P 3.1: Hauptvortrag
Montag, 16. März 2026, 16:15–16:45, KH 02.016
EMC3-Eirene simulation of neutral source effects on density build-up in the W7-X island divertor — •Victoria Winters1,2, Felix Reimold2, Yuhe Feng2, Victoria Haak2, Valeria Perseo2, Georg Schlisio2, and The W7-X Team2 — 1Universität Greifwald, Institut für Physik, Greifswald D-17489 Germany — 2Max-Planck-Institut für Plasmaphysik, Greifswald D-17491 Germany
Achieving high plasma density near the divertor target in magnetically confined fusion devices is crucial for efficient heat and particle exhaust. The W7-X stellarator is qualifying the island divertor as a potential exhaust solution for a future stellarator reactor. Simplified models of the island divertor predict that increasing the internal island field line pitch (Θ) should have a beneficial effect on density build-up at the divertor. This hypothesis was tested numerically using the EMC3-Eirene code for three different W7-X magnetic configurations with increasing Θ (low iota, standard, and high iota). While the low iota configuration showed the poorest density build-up, as expected, no improvement in density build-up was observed between standard and high iota, even with the factor of 2 increase in Θ. This deviation from predicted behavior was attributed to the proximity of the X-point to a vertical divertor plate, introducing a limiter-like component. Removing the vertical target from the simulation recovered the expected scaling from the simplified models. This work underscores the importance of the island's neutral screening efficiency on density build-up. Potential consequences, such as inducing X-point radiators, will be discussed.
Keywords: stellarator; Wendelstein 7-X; divertor; EMC3-Eirene