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P: Fachverband Plasmaphysik
P 16: Poster: Plasma- Wand- Wechselwirkung
P 16.3: Poster
Donnerstag, 28. Februar 2013, 14:00–16:00, Poster EG
Influence of particle flux on morphology changes of tungsten — •Luxherta Buzi1, Greg De Temmerman2, Bernd Schweer1, Alexis Terra1, Bernhard Unterberg1, and Guido Van Oost3 — 1Institut für Energie- und Klimaforschung - Plasmaphysik, Forschungszentrum Jülich GmbH, Association EURATOM-FZJ*, D-52425 Jülich, Germany — 2FOM-DIFFER*, Association EURATOM-FOM, P.O. Box 1207, 3430 BE Nieuwegein, The Netherlands — 3Department of Applied Physics, Ghent University B-9000 Ghent, Belgium , *Partners in the Trilateral Euregio Cluster
Tungsten is currently considered as the main candidate material for high heat flux components of future fusion devices. Bombardment of tungsten surfaces by large fluences of low energy particles such as hydrogen isotopes and helium can lead to strong microstructural changes which are mechanically unstable. The occurrence of those effects is strongly dependent on the surface temperature and particle flux. In this contribution we will present the experiments done at PSI-2 linear plasma device in order to generate surface modifications on tungsten. The power flux density delivered to the target at PSI-2 is up to 2 MWm−2 and the ion flux density is of the order of 1022 − 1023 m−2s−1. A dedicated actively heated sample holder was designed and tested in order to provide the required temperature range from 300K to 1800K. We present here the first measurements performed at PSI-2 whereas subsequent experiments are foreseen at Pilot-PSI and MAGNUM-PSI linear plasma devices with higher flux densities up to 1025 m−2s−1.