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Multiscale modelling of plasma wall interactions

par Caroline CHAMPENOIS - publié le

le 21 mars 14:00 service 322

Etienne Hodille
Department of physics, University of Helsinki, Finland

Abstract :
During plasma operation in a tokamak, large flux of plasma particles (mostly hydrogen isotopes (H)) interacts with the plasma facing components leading to intense plasma wall interactions. The materials chosen to sustain these plasma-wall interactions in ITER are beryllium (Be) on the first wall and tungsten (W) on the divertor. During the plasma-wall interactions, several processes can occur such as reflection of the plasma particle, implantation, diffusion and trapping in the materials or sputtering of the materials. Thus, the understanding of plasma wall interactions is a major concern for tokamak design for safety and plasma control issues.
This presentation shows how, from modelling at different scales the interactions between H and the materials, one can gather more and more understanding of these critical issues. First, the study of interactions of H in W will be presented. This part of the presentation focuses on the description of the modelling effort to understand the trapping processes of H in W from density functional theory (DFT) to macroscopic scales. Then, the study of interaction of hydrogen and beryllium materials will be presented. This part focuses on the interaction of H with BeO from DFT to molecular dynamics (MD) scales in order to gain insight on the reflection and sputtering properties of BeO irradiated by plasma particles.

contact : Yves Ferro


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