M.H.J. 't Hoen
P.A. Zeijlmans van Emmichoven
- Deuterium retention and surface modifications of nanocrystalline tungsten films exposed to high-flux plasma
- Journal of Nuclear Materials
- Pages (from-to)
- Document type
- Faculty of Science (FNWI)
- Van 't Hoff Institute for Molecular Sciences (HIMS)
Deuterium retention studies are presented for nanostructured tungsten films exposed to high-flux deuterium plasmas. Thin tungsten films of similar to 1 mu m thickness were deposited with pulsed laser deposition (PLD) on bulk tungsten. Surface modifications were studied with scanning electron microscopy and deuterium retention with thermal desorption spectroscopy. Three types of PLD films with different densities and crystallinity were studied after exposure to deuterium plasmas. The surface temperature ranged from about 460 K at the periphery to about 520 K in the centre of the targets. The films withstand the intense plasma exposure well and maintain their overall integrity. An increase of deuterium retention is observed with decreasing tungsten density and crystallite size. We found that the filling of these thin films with deuterium is significantly faster than for pre-damaged polycrystalline tungsten. We observed formation of micrometer-sized blisters as well as structures on the nanometer scale, both depending on the layer type.
- go to publisher's site
- Proceedings title: Plasma Surface Interactions 21 - Proceedings of the 21st International Conference on Plasma-Surface Interactions
in Controlled Fusion Devices, Kanazawa, Japan May 26-30, 2014
Place of publication: Amsterdam
Editors: Y. Ueda, N. Asakura, K. Hoshino, A. Ito, S. Kajita, M. Kobayashi, H.T. Lee, T. Nakano, M. Tokitani
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