The effect of ion flux on plasma-induced modification and deuterium retention in tungsten and tungsten–tantalum alloys

TitleThe effect of ion flux on plasma-induced modification and deuterium retention in tungsten and tungsten–tantalum alloys
Publication TypeJournal Article
Year of Publication2015
AuthorsY. Zayachuk, A. Manhard, M.HJ 't Hoen, W. Jacob, P.AZeijlma van Emmichoven, G. Van Oost
JournalJournal of Nuclear Materials
Volume464
Pagination69-72
Date PublishedSept
Abstract

The paper presents the results of an experimental study of deuterium retention in W and W–Ta alloy that were exposed to first-wall relevant low flux (∼1020 m−2 s−1) deuterium plasma in the ECR plasma generator PlaQ. Subsequent analysis included surface imaging by optical microscopy, deuterium depth profiling by nuclear reaction analysis (NRA) and measurements of deuterium content by thermal desorption spectroscopy (TDS). It was found that under investigated exposure conditions the deuterium content was higher in W–Ta alloy than in W. Combined with the previously reported results showing that under high-flux (∼1024 m−2 s−1) retention is higher in W instead, this gives rise to a peculiar flux effect – dependence of relative retention between different materials on exposure flux. We interpret this effect as evidence that at different flux ranges different populations of trapping sites determine the retention, namely pre-existing microstructural traps at low-flux exposure and plasma-induced ones at high-flux exposure.

DOI10.1016/j.jnucmat.2015.04.028
Division

PSI

Department

PSI-E

PID

d9e7cdaca8a94724e6459dbb1d21866f

Alternate TitleJ. Nucl. Mater.

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