Deuterium-induced nanostructure formation on tungsten exposed to high-flux plasma

H.Y. Xu, G.C. De Temmerman, G.-N. Luo, Y.Z. Jia, Y. Yuan, B.Q. Fu, A. Godfrey, W. Liu

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Abstract

PLASMA-SURFACE INTERACTIONS 21 — Proceedings of the 21st International Conference on Plasma-Surface Interactions in Controlled Fusion Devices Kanazawa, Japan May 26-30, 2014 Surface topography of polycrystalline tungsten (W) have been examined after exposure to a low-energy (38 eV/D), high-flux (1.1–1.5 1024 m2 s1) deuterium plasma in the Pilot-PSI linear plasma device. The methods used were scanning electron microscopy (SEM), transmission electron microscopy (TEM), positron annihilation Doppler broadening (PADB) and grazing incident X-ray diffraction (GI-XRD). After exposure to high flux D plasma, blisters and nanostructures are formed on the W surface. Generation of defects was evidenced by PADB, while high stress and mixture of phases were detected in depth of 50 nm by GI-XRD. TEM observation revealed fluctuations and disordered microstructure on the outmost surface layer. Based on these results, surface reconstruction is considered as a possible mechanism for the formation of defects and nanostructures.
Original languageEnglish
Pages (from-to)308-311
Number of pages4
JournalJournal of Nuclear Materials
Volume463
DOIs
Publication statusPublished - 2015

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