Tungsten redistribution patterns in ASDEX Upgrade

K. Krieger (Corresponding Author), Jari Likonen, M. Mayer, R. Pugno, V. Rohde, Elizaveta Vainonen-Ahlgren

    Research output: Contribution to journalArticleScientificpeer-review

    16 Citations (Scopus)

    Abstract

    In ASDEX Upgrade tungsten is used as a high-Z plasma facing material. Its erosion, migration and subsequent deposition have been studied by analysis of a set of customised marker tiles, which was installed in the divertor and at the central column for one experimental campaign. Erosion rates were determined at the central column, which was the main tungsten source in that campaign. Deposition rates were determined at the central column and in the divertor region. The W-deposition in the divertor is strongly correlated to the local strike point exposure time. In contrast to low-Z wall materials, where deposition occurs mainly in the inner divertor, tungsten is found in similar quantities also in the outer divertor. The total amount of tungsten deposited outside the central column is about 40% of the gross W-source at the central column. One possible explanation for the 60% undetected tungsten might be the prompt local redeposition of eroded W atoms.
    Original languageEnglish
    Pages (from-to)10 - 16
    Number of pages7
    JournalJournal of Nuclear Materials
    Volume337 - 339
    DOIs
    Publication statusPublished - 2005
    MoE publication typeA1 Journal article-refereed

    Keywords

    • ASDEX upgrade
    • erosion
    • deposition
    • first wall
    • impurity transport
    • tungsten
    • ITER
    • JET
    • fusion energy

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    Krieger, K., Likonen, J., Mayer, M., Pugno, R., Rohde, V., & Vainonen-Ahlgren, E. (2005). Tungsten redistribution patterns in ASDEX Upgrade. Journal of Nuclear Materials, 337 - 339, 10 - 16. https://doi.org/10.1016/j.jnucmat.2004.09.044