Deuterium trapping and release in JET ITER-like wall divertor tiles

J. Likonen (Corresponding Author), K. Heinola, A. De Backer, S. Koivuranta, Antti Hakola, C. F. Ayres, A. Baron-Wiechec, P. Coad, G. F. Matthews, M. Mayer, A. Widdowson

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)

Abstract

A selected set of samples from JET-ILW divertor tiles exposed in 2011-2012 has been analysed using thermal desorption spectrometry (TDS). The highest amount of deuterium was found on the regions with the thickest deposited layers, i.e. on the horizontal (apron) part and on the top part of Tile 1, which resides deep in the scrape-off layer. Outer divertor Tiles 6, 7 and 8 had nearly an order of magnitude less deuterium. The co-deposited layers on the JET tiles and the W coatings contain C, O and Ni impurities which may change the desorption properties. The D2 signals in the TDS spectra were convoluted and the positions of the peaks were compared with the Be and C amounts but no correlations between them were found. The remaining fractions of D in the analysed samples at ITER baking temperature 350 °C are rather high implying that co-deposited films may be difficult to be de-tritiated.

Original languageEnglish
Article number014074
JournalPhysica Scripta
Volume2016
Issue numberT167
DOIs
Publication statusPublished - 25 Jan 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

tiles
Tile
Trapping
Desorption
deuterium
trapping
desorption
baking
Impurities
spectroscopy
Coating
Horizontal
coatings
impurities
temperature

Keywords

  • deuterium
  • JET
  • retention

Cite this

Likonen, J. ; Heinola, K. ; De Backer, A. ; Koivuranta, S. ; Hakola, Antti ; Ayres, C. F. ; Baron-Wiechec, A. ; Coad, P. ; Matthews, G. F. ; Mayer, M. ; Widdowson, A. / Deuterium trapping and release in JET ITER-like wall divertor tiles. In: Physica Scripta. 2016 ; Vol. 2016, No. T167.
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abstract = "A selected set of samples from JET-ILW divertor tiles exposed in 2011-2012 has been analysed using thermal desorption spectrometry (TDS). The highest amount of deuterium was found on the regions with the thickest deposited layers, i.e. on the horizontal (apron) part and on the top part of Tile 1, which resides deep in the scrape-off layer. Outer divertor Tiles 6, 7 and 8 had nearly an order of magnitude less deuterium. The co-deposited layers on the JET tiles and the W coatings contain C, O and Ni impurities which may change the desorption properties. The D2 signals in the TDS spectra were convoluted and the positions of the peaks were compared with the Be and C amounts but no correlations between them were found. The remaining fractions of D in the analysed samples at ITER baking temperature 350 °C are rather high implying that co-deposited films may be difficult to be de-tritiated.",
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Likonen, J, Heinola, K, De Backer, A, Koivuranta, S, Hakola, A, Ayres, CF, Baron-Wiechec, A, Coad, P, Matthews, GF, Mayer, M & Widdowson, A 2016, 'Deuterium trapping and release in JET ITER-like wall divertor tiles', Physica Scripta, vol. 2016, no. T167, 014074. https://doi.org/10.1088/0031-8949/T167/1/014074

Deuterium trapping and release in JET ITER-like wall divertor tiles. / Likonen, J. (Corresponding Author); Heinola, K.; De Backer, A.; Koivuranta, S.; Hakola, Antti; Ayres, C. F.; Baron-Wiechec, A.; Coad, P.; Matthews, G. F.; Mayer, M.; Widdowson, A.

In: Physica Scripta, Vol. 2016, No. T167, 014074, 25.01.2016.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Likonen, J.

AU - Heinola, K.

AU - De Backer, A.

AU - Koivuranta, S.

AU - Hakola, Antti

AU - Ayres, C. F.

AU - Baron-Wiechec, A.

AU - Coad, P.

AU - Matthews, G. F.

AU - Mayer, M.

AU - Widdowson, A.

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N2 - A selected set of samples from JET-ILW divertor tiles exposed in 2011-2012 has been analysed using thermal desorption spectrometry (TDS). The highest amount of deuterium was found on the regions with the thickest deposited layers, i.e. on the horizontal (apron) part and on the top part of Tile 1, which resides deep in the scrape-off layer. Outer divertor Tiles 6, 7 and 8 had nearly an order of magnitude less deuterium. The co-deposited layers on the JET tiles and the W coatings contain C, O and Ni impurities which may change the desorption properties. The D2 signals in the TDS spectra were convoluted and the positions of the peaks were compared with the Be and C amounts but no correlations between them were found. The remaining fractions of D in the analysed samples at ITER baking temperature 350 °C are rather high implying that co-deposited films may be difficult to be de-tritiated.

AB - A selected set of samples from JET-ILW divertor tiles exposed in 2011-2012 has been analysed using thermal desorption spectrometry (TDS). The highest amount of deuterium was found on the regions with the thickest deposited layers, i.e. on the horizontal (apron) part and on the top part of Tile 1, which resides deep in the scrape-off layer. Outer divertor Tiles 6, 7 and 8 had nearly an order of magnitude less deuterium. The co-deposited layers on the JET tiles and the W coatings contain C, O and Ni impurities which may change the desorption properties. The D2 signals in the TDS spectra were convoluted and the positions of the peaks were compared with the Be and C amounts but no correlations between them were found. The remaining fractions of D in the analysed samples at ITER baking temperature 350 °C are rather high implying that co-deposited films may be difficult to be de-tritiated.

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