Greifswald 2024 – scientific programme

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P: Fachverband Plasmaphysik

P 20: Magnetic Confinement VI

P 20.1: Invited Talk

Thursday, February 29, 2024, 11:00–11:30, ELP 6: HS 3

Modelling of tungsten erosion and deposition in fusion devices — •Andreas Kirschner, Sebastijan Brezinsek, and Juri Romazanov — Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, 52425 Jülich, Germany

In magnetically confined fusion devices plasma-wall interaction and resulting erosion and deposition at the wall components is a major concern due to lifetime limitations of the wall components, long-term tritium retention via co-deposition and plasma contamination by eroded impurities. Tungsten is currently the favoured wall material for future fusion devices due to comparably low sputtering and high melting point. However, as high-Z material, tungsten can lead to unacceptably high radiation in the core plasma resulting in plasma collapse. Therefore, detailed understanding of tungsten erosion, migration and redeposition is needed to minimise the net erosion of tungsten. The present contribution provides an overview of the main processes involved in tungsten erosion and migration. The role of the eroding species will be discussed in view of fuel ions (including isotope effects) and CX neutrals compared to plasma impurities and tungsten self-sputtering. Also, the contribution of intra- and inter-ELM phases to the tungsten erosion will be analysed. The importance and extent of tungsten prompt redeposition, which reduces the net erosion, will be examined. Besides more generic studies, ERO modelling in combination with experimental findings in particular from the divertor of JET will be shown.

Keywords: Plasma-wall interaction; Tungsten sputtering; Prompt redeposition; ERO