Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 14: Surface Chemical Dynamics

O 14.3: Vortrag

Montag, 7. März 2016, 15:30–15:45, S053

Reaction-diffusion modeling of hydrogen in beryllium — •Mirko Wensing, Dmitry Matveev, and Christian Linsmeier — Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, 52425 Jülich, Germany

Beryllium will be used as first-wall material for the future fusion reactor ITER as well as in the breeding blanket of DEMO. In both cases it is important to understand the mechanisms of hydrogen retention in beryllium. In earlier experiments with beryllium [1] low-energy binding states of hydrogen were observed by thermal desorption spectroscopy (TDS) which are not yet well understood. Two candidates for these states are considered: beryllium-hydride phases within the bulk and surface effects. The retention of deuterium in beryllium is studied by a reaction rate approach using a coupled reaction diffusion system (CRDS)-model relying on ab initio data from density functional theory calculations (DFT). In this contribution we try to assess the influence of surface recombination. [1] M. Reinelt, A. Allouche, M. Oberkofler, C. Linsmeier, New J. Phys. 11 043023 (2009)