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

Yevhen Zayachuk; Armin Manhard; M.H.J. 't Hoen; Wolfgang Jacob; P.A. Zeijlmans van Emmichoven; Guido Van Oost

doi:10.1016/j.jnucmat.2015.04.028

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

Yevhen Zayachuk, Armin Manhard, M.H.J. 't Hoen, Wolfgang Jacob, P.A. Zeijlmans van Emmichoven, Guido Van Oost

Research output › peer-review

25 Scopus citations

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.

Original language	English
Pages (from-to)	69-72
Number of pages	4
Journal	Journal of Nuclear Materials
Volume	464
DOIs	https://doi.org/10.1016/j.jnucmat.2015.04.028
State	Published - 23 Apr 2015

ASJC Scopus subject areas

Nuclear and High Energy Physics
General Materials Science
Nuclear Energy and Engineering

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Cite this

@article{275b143bc8fc4365b0755cde3cbab41c,

title = "The effect of ion flux on plasma-induced modification and deuterium retention in tungsten and tungsten-tantalum alloys",

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.",

keywords = "Tungsten, ITER, First wall materials",

author = "Yevhen Zayachuk and Armin Manhard and {'t Hoen}, M.H.J. and Wolfgang Jacob and {Zeijlmans van Emmichoven}, P.A. and {Van Oost}, Guido",

note = "Funding Information: This work, supported by the European Communities under the contract of Associations between EURATOM and SCK•CEN, was carried out within the framework of the European Fusion Development Agreement. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Publisher Copyright: {\textcopyright} 2015 Elsevier B.V. All rights reserved.",

year = "2015",

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doi = "10.1016/j.jnucmat.2015.04.028",

language = "English",

volume = "464",

pages = "69--72",

journal = "Journal of Nuclear Materials",

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T1 - The effect of ion flux on plasma-induced modification and deuterium retention in tungsten and tungsten-tantalum alloys

AU - Zayachuk, Yevhen

AU - Manhard, Armin

AU - 't Hoen, M.H.J.

AU - Jacob, Wolfgang

AU - Zeijlmans van Emmichoven, P.A.

AU - Van Oost, Guido

N1 - Funding Information: This work, supported by the European Communities under the contract of Associations between EURATOM and SCK•CEN, was carried out within the framework of the European Fusion Development Agreement. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Publisher Copyright: © 2015 Elsevier B.V. All rights reserved.

PY - 2015/4/23

Y1 - 2015/4/23

N2 - 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.

AB - 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.

KW - Tungsten

KW - ITER

KW - First wall materials

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