Berlin 2014 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 30: Plasma Wall Interactions
P 30.3: Vortrag
Freitag, 21. März 2014, 14:45–15:00, SPA HS202
Influence of tungsten microstructure and ion flux on deuterium plasma-induced surface modifications and deuterium retention — •Luxherta Buzi1,2,3, Greg De Temmerman2, Michael Reinhart1, Dmitry Matveev1, Bernhard Unterberg1, Guido Van Oost3, Peter Wienhold1, Uwe Breuer1, and Arkadi Kreter1 — 1IEK - Plasmaphysik, Forschungszentrum Jülich GmbH, Association EURATOM-FZJ, 52425 Jülich, Germany — 2FOM Institute DIFFER-Dutch Institute for Fundamental Energy Research, Edisonbaan 14, the Netherlands — 3Ghent University, Sint-Pietersnieuwstraat 41, B-9000, Ghent, Belgium
Tungsten is to be used as plasma-facing material for the ITER divertor due to its favourable thermal properties, low erosion and fuel retention. Bombardment of tungsten by low energy ions of hydrogen isotopes, at different surface temperature, can lead to surface modifications and influence the fuel accumulation in the material. This contribution will assess the impact of material microstructure and the correlation between the particle flux, surface modifications and deuterium retention in tungsten. Tungsten samples were exposed to deuterium plasma at a surface temperature of 510 K, 670 K and 870 K, ion energy of 40 eV and ion fluence of 1026 m−2. The high and low ion flux ranges were in the order 1024 m−2s−1 and 1022 m−2s−1. Depth profiling of deuterium in all the samples was done by secondary ion mass spectroscopy technique and a scanning electron microscope was used to investigate the surface modifications. Modelling of the D desorption spectra with the coupled reaction diffusion system model will be also presented.