Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 17: Poster Session II

P 17.1: Poster

Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG

Assessing the validity of simplified models to describe the island divertor — •Nassim Maaziz, Felix Reimold, Vicoria Winters, David Bold, Sergei Makarov, Yühe Feng, and The W7-X Team — Max Planck Institute for Plasma Physics, 17491 Greifswald

In a nuclear fusion reactor power and particle exhaust is crucial. In stellarators the island divertor concept has been proposed as an exhaust solution. In essence a resonant component of the magnetic field creates a chain of magnetic islands around the core. These islands divert heat and particles towards the material interface. This concept is utilized in the W7-X stellarator and shows promising performance [1]. However, particle exhaust is less efficient in stellarators than in tokamaks. Increasing the plasma density at the target (plasma-surface-interaction zone) is required to improve it. The density in the divertor depends on the particle, energy, and momentum transport. Understanding the transport in the 3D island divertor is challenging. Hence, simplified models have been developed to describe the island divertor. This work assesses the validity of a simplified model: the stellarator two-point model [2]. Model predictions are compared to simulations of an island divertor geometry performed with the 3D self-consistent fluid code EMC3- EIRENE. Past comparisons claim that the simplified model is able to describe EMC3-EIRENE simulations [3], but our results indicate that the applied simplifications are not valid. In particular, we have identified that momentum losses are more complex, and that parallel heat convection and explicit particle sources cannot be neglected. [1]NF611060032021 [2]NF468072006 [3]PPCF530240092011

Keywords: Stellarator; Island Divertor; EMC3-EIRENE