Work

Investigating the role of divertor geometry on density build-up in the island divertor

Year: 2025

Type: article

Abstract: The island divertor has been proposed for power and particle exhaust in stellarators. It is investigated in the Wendelstein 7-X (W7-X) experiment. The divertor capabilities such as particle exhaust or radiative power dissipation scale with the divertor density. However, significantly lower divertor density has been obtained in W7-X in comparison to tokamaks and no high-recycling scaling is observed. To alleviate the impact of the complicated geometry, a simplified geometry model for the island divertor in EMC3-EIRENE is developed and used to investigate the effect of the divertor target geometry. We show that compared to the open divertor, a closed divertor geometry leads to higher achievable densities and in particular a much stronger scaling of the target density with respect to the separatrix density. • Simplified island divertor geometry developed for physics studies with EMC3-EIRENE. • Stronger density build-up in closed compared to open island divertor configuration. • Localization of the ionization sources important for density build-up.

Source: Nuclear Materials and Energy

DOI: 10.1016/j.nme.2025.101886

Authors: N. Maaziz, F. Reimold, V.R. Winters, D. Bold, Y. Feng, V. Perseo

Institution: Max Planck Institute for Plasma Physics - Greifswald

Language: English

Topic: Magnetic confinement fusion research

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $2,190