Structural studies of deposited layers on JET MkII-SRP inner divertor tiles

Jari Likonen (Corresponding Author), J.P. Coad, Elizaveta Vainonen-Ahlgren, Tommi Renvall, D.E. Hole, M. Rubel, A. Widdowson

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    Abstract

    Deposited layers formed on JET inner divertor tiles during 1998-2004 and 2001-2004 campaigns have been investigated using secondary ion mass spectrometry (SIMS), Rutherford Backscattering (RBS) and optical microscopy. The thickness of the deposit decreases from the top of vertical tile 1 to the bottom and then increases on vertical tile 3 reaching ¡­60 ¥ìm. There are even thicker deposits on the small sloping section of the floor tile 4 that can be accessed by the plasma at the inner divertor legs. Deposited films on divertor inner wall tiles are enriched in Be indicating chemical erosion of C and a multi-step transport of C to the shadowed area on floor tile 4. The films have generally a layered and globular structure in the areas with plasma contact.
    Original languageEnglish
    Pages (from-to)190-195
    JournalJournal of Nuclear Materials
    Volume363-365
    DOIs
    Publication statusPublished - 2007
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Beryllium
    • Carbon based materials
    • Divertor
    • Rutherford backscattering
    • Surface analysis

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    Likonen, J., Coad, J. P., Vainonen-Ahlgren, E., Renvall, T., Hole, D. E., Rubel, M., & Widdowson, A. (2007). Structural studies of deposited layers on JET MkII-SRP inner divertor tiles. Journal of Nuclear Materials, 363-365, 190-195. https://doi.org/10.1016/j.jnucmat.2007.01.007