München 2019 – scientific programme

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P: Fachverband Plasmaphysik

P 3: Plasma Surface Interaction I

P 3.2: Talk

Monday, March 18, 2019, 11:45–12:00, HS 21

Development of a 3D model for hydrogen outgassing from ion-irradiated materials — •Md Al-Beruni, Dmitry Matveev, Bernhard Unterberg, and Christian Linsmeier — Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung, 52425 Jülich, Germany

In future fusion reactors such as ITER and DEMO, plasma-material interactions impose limitations on the plasma performance. High heat and particle loads, implantation of hydrogen isotopes cause deterioration of material properties and build-up of radioactive tritium in the plasma-facing wall components, which represents a safety concern. Together with dedicated experiments, computational modeling is utilized to understand the fundamental processes of hydrogen transport and retention. Trapping and de-trapping of hydrogen from lattice defects of materials, hydrogen diffusion, as well as recombination of hydrogen atoms to molecules leading to molecular desorption can be modeled by systems of coupled non-linear PDEs. So far, those non-linear PDE systems have been successfully solved numerically in 1D. However, in some cases, non-uniform distributions of the ion flux, material properties, temperature, as well as other geometrical effects require a consistent 3D description. In this contribution, examples of 3D simulations implemented in Wolfram Mathematica and COMSOL Multiphysics will be presented and compared with respective 1D simulations.