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P: Fachverband Plasmaphysik
P 16: Poster Session - Helmholtz Graduate School for Plasma Physics
P 16.5: Poster
Dienstag, 3. März 2015, 16:30–18:30, Foyer Audimax
Hydrogen Diffusion in Tungsten near Room Temperature — •Stefan Kapser1,2 and Armin Manhard1 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany — 2Physik-Department E28, Technische Universität München, 85748 Garching, Germany
Tungsten is a promising candidate for the use as plasma-facing material of a future nuclear fusion reactor, where it would be subjected to high fluxes of deuterium and tritium. It is crucial for safety considerations to estimate the uptake of the radioactive tritium by tungsten and its possible diffusion through it. Most investigations of hydrogen diffusion in tungsten have been performed only at very high temperatures. Thus measurements at lower temperatures are needed to verify or correct extrapolations from high temperature data.
A very direct method to study the diffusion of hydrogen in metals are permeation experiments. For hydrogen permeation measurements on tungsten, extremely thin samples are needed to achieve a measurable signal due to the very low solubility, and thus permeability, of hydrogen in tungsten. Such thin tungsten samples have been produced by electrochemical thinning of rolled foils. Hydrogen diffusion in these samples is studied using an electrochemical method. For comparison deuterium plasma implantation with subsequent diffusion is investigated in the same material. The dependence of the results on the tungsten microstructure is analyzed.