München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.85: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

Temperature depence of the erosion of tungsten based smart alloys for the first wall of fusion power plants — •Karen De Lannoye1,2, Janina Schmitz1,3, Andrey Litnovsky1, Felix Klein1, Arkadi Kreter1, and Christian Linsmeier11Forschungszentrum Jülich, IEK-4, 52425 Jülich, Germany — 2Vrije Universiteit Brussel, 1000 Brussels, Belgium — 3Department of Applied Physics, Ghent University, 9000 Ghent, Belgium

The first wall of future fusion power plants, like DEMO, will be exposed to high heat and high particle loads. Few materials can withstand these conditions. Tungsten (W) is a good candidate as a first wall material, as one of the main advantages is its low erosion rate. Fast oxidation of W at high temperatures when coming in contact with air might disqualify W in the course of an accident. Self-passivating tungsten-chromium-yttrium (WCrY) smart alloys (SA) are designed to prevent this oxidation. SA and reference W samples were exposed to steady-state D plasma to determine the erosion rate. The first experiment at around 650 oC with an ion energy of 220 eV and fluence of 1 . 1026 ions/m2 revealed the necessity of considering diffusion of alloying elements in order to evaluate the sputtering rates. In order to determine the impact of diffusion on erosion of smart alloys, three experiments were done at the different temperatures of about 300 oC, 650 oC and 800 oC. The ion energy and fluence were kept at 60 eV and 1 . 1026 ions/m2, respectively, for all three experiments. Analysed results of the experiments, with special regard to the temperature effects, will be presented in this contribution.

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