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.",
    keywords = "deuterium, JET, retention",
    author = "J. Likonen and K. Heinola and {De Backer}, A. and S. Koivuranta and Antti Hakola and Ayres, {C. F.} and A. Baron-Wiechec and P. Coad and Matthews, {G. F.} and M. Mayer and A. Widdowson",
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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 - 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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    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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