Surface modification of tungsten and tungsten-tantalum alloys exposed to high-flux deuterium plasma and its impact on deuterium retention

TitleSurface modification of tungsten and tungsten-tantalum alloys exposed to high-flux deuterium plasma and its impact on deuterium retention
Publication TypeJournal Article
Year of Publication2013
AuthorsY. Zayachuk, M.HJ 't Hoen, P.AZeijlma van Emmichoven, D. Terentyev, I. Uytdenhouwen, G. Van Oost
JournalNuclear Fusion
Volume53
Number1
Pagination013013
Date PublishedJan
ISBN Number0029-5515
Abstract

Samples of tungsten and tungsten-tantalum alloy (with 5 mass per cent of Ta) were exposed to high-flux deuterium plasma at different fluences. The surface modification was studied with scanning electron microscopy, and deuterium retention was measured by thermal desorption spectroscopy (TDS). In the high fluence range of similar to 3.5 x 10(26)-10(27)m(-2), multiple large-size blisters are formed on the W surface, while blisters on the W-Ta surface are considerably smaller in size and number. Deuterium retention in this fluence range was found to be systematically higher in W than in W-Ta. Correlation between the evolution of the blistering patterns and the TDS spectra as a function of fluence suggests that trapping in the sub-surface cavities associated with blisters is the predominant trapping mechanism in tungsten in the case of high fluence exposures. We attribute the lower retention in W-Ta under the investigated conditions to the weaker blistering.

DOI10.1088/0029-5515/53/1/013013
Division

PSI

Department

PSI-E

PID

70b294593f187b97bc0761c7ee1e06bb

Alternate TitleNucl. Fusion
LabelOA
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