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

    Research output: Contribution to journalArticleScientificpeer-review

    14 Citations (Scopus)

    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

    Fingerprint

    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.
    @article{84fa3348f01447618a2a408012c1db6f,
    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}",
    note = "Project code: 104445",
    year = "2015",
    doi = "10.1016/j.jnucmat.2014.12.015",
    language = "English",
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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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