Microscopically nonuniform deposition and deuterium retention in the divertor in JET with ITER-like wall

H. Bergsåker (Corresponding Author), I. Bykov, P. Petersson, G. Possnert, J. Likonen, S. Koivuranta, J.P. Coad, W. van Renterghem, I. Uytdenhouwen, A.M. Widdowson, JET EFDA Contributors

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Abstract

The divertor surfaces in JET with ITER-like wall (ILW) have been studied using micro ion beam analysis (u-IBA) methods and scanning electron microscopy (SEM). Deposited layers with beryllium as main constituent had been formed during plasma operations through 2011-2012. The deuterium trapping and impurity deposition were non-uniform, frequently enhanced within pits, cracks and valleys, regions reaching in size from 10 um to 200 um. The impurity deposition and fuel retention were correlated with the surface slope with respect to the direction of ion incidence. Typically more than 70% of the total measured areal density of trapped D was found in less than 30% of the surface area. This is of consequence for the interpretation of other surface analyses and in extrapolation from fuel retention in JET with ITERlike wall and rough divertor surfaces to ITER with smoother surfaces.
Original languageEnglish
Pages (from-to)956-960
JournalJournal of Nuclear Materials
Volume463
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

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Deuterium
deuterium
Impurities
Beryllium
impurities
beryllium
Extrapolation
Ion beams
valleys
extrapolation
cracks
incidence
ion beams
trapping
Ions
slopes
Cracks
Plasmas
Scanning electron microscopy
scanning electron microscopy

Cite this

Bergsåker, H. ; Bykov, I. ; Petersson, P. ; Possnert, G. ; Likonen, J. ; Koivuranta, S. ; Coad, J.P. ; van Renterghem, W. ; Uytdenhouwen, I. ; Widdowson, A.M. ; Contributors, JET EFDA. / Microscopically nonuniform deposition and deuterium retention in the divertor in JET with ITER-like wall. In: Journal of Nuclear Materials. 2015 ; Vol. 463. pp. 956-960.
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title = "Microscopically nonuniform deposition and deuterium retention in the divertor in JET with ITER-like wall",
abstract = "The divertor surfaces in JET with ITER-like wall (ILW) have been studied using micro ion beam analysis (u-IBA) methods and scanning electron microscopy (SEM). Deposited layers with beryllium as main constituent had been formed during plasma operations through 2011-2012. The deuterium trapping and impurity deposition were non-uniform, frequently enhanced within pits, cracks and valleys, regions reaching in size from 10 um to 200 um. The impurity deposition and fuel retention were correlated with the surface slope with respect to the direction of ion incidence. Typically more than 70{\%} of the total measured areal density of trapped D was found in less than 30{\%} of the surface area. This is of consequence for the interpretation of other surface analyses and in extrapolation from fuel retention in JET with ITERlike wall and rough divertor surfaces to ITER with smoother surfaces.",
author = "H. Bergs{\aa}ker and I. Bykov and P. Petersson and G. Possnert and J. Likonen and S. Koivuranta and J.P. Coad and {van Renterghem}, W. and I. Uytdenhouwen and A.M. Widdowson and Contributors, {JET EFDA}",
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Bergsåker, H, Bykov, I, Petersson, P, Possnert, G, Likonen, J, Koivuranta, S, Coad, JP, van Renterghem, W, Uytdenhouwen, I, Widdowson, AM & Contributors, JETEFDA 2015, 'Microscopically nonuniform deposition and deuterium retention in the divertor in JET with ITER-like wall', Journal of Nuclear Materials, vol. 463, pp. 956-960. https://doi.org/10.1016/j.jnucmat.2014.12.015

Microscopically nonuniform deposition and deuterium retention in the divertor in JET with ITER-like wall. / Bergsåker, H. (Corresponding Author); Bykov, I.; Petersson, P.; Possnert, G.; Likonen, J.; Koivuranta, S.; Coad, J.P.; van Renterghem, W.; Uytdenhouwen, I.; Widdowson, A.M.; Contributors, JET EFDA.

In: Journal of Nuclear Materials, Vol. 463, 2015, p. 956-960.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Microscopically nonuniform deposition and deuterium retention in the divertor in JET with ITER-like wall

AU - Bergsåker, H.

AU - Bykov, I.

AU - Petersson, P.

AU - Possnert, G.

AU - Likonen, J.

AU - Koivuranta, S.

AU - Coad, J.P.

AU - van Renterghem, W.

AU - Uytdenhouwen, I.

AU - Widdowson, A.M.

AU - Contributors, JET EFDA

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AB - The divertor surfaces in JET with ITER-like wall (ILW) have been studied using micro ion beam analysis (u-IBA) methods and scanning electron microscopy (SEM). Deposited layers with beryllium as main constituent had been formed during plasma operations through 2011-2012. The deuterium trapping and impurity deposition were non-uniform, frequently enhanced within pits, cracks and valleys, regions reaching in size from 10 um to 200 um. The impurity deposition and fuel retention were correlated with the surface slope with respect to the direction of ion incidence. Typically more than 70% of the total measured areal density of trapped D was found in less than 30% of the surface area. This is of consequence for the interpretation of other surface analyses and in extrapolation from fuel retention in JET with ITERlike wall and rough divertor surfaces to ITER with smoother surfaces.

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