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

    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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  • 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. (2015). Microscopically nonuniform deposition and deuterium retention in the divertor in JET with ITER-like wall. Journal of Nuclear Materials, 463, 956-960. https://doi.org/10.1016/j.jnucmat.2014.12.015