Ion beam micro analysis of deposits at tokamak divertor surfaces

P. Petersson (Corresponding Author), H. Bergsåker, G. Possnert, J. P. Coad, Seppo Koivuranta, Jari Likonen

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    Abstract

    Cross sections of deposited layers in the Joint European Torus (JET) were analysed using the nuclear micro analysis at the Tandem Laboratory, Uppsala University. For deuterium and beryllium the nuclear reactions 2D(3He,p)4He and 9Be(3He,pn)11B were exploited for analysis. Typically the analyses have been made with 10 μm spatial resolution and a sensitivity of better than one atomic percent for beryllium or deuterium in carbon matrix. Comparing several different surface treatment techniques shows that polishing the sample surface give very good optical surface information but that some amount of deuterium and beryllium probably is removed. For good quantitative results the measurement can either be done on a rough surface or the top of the polished surface can be cut off.
    Original languageEnglish
    Pages (from-to)1838-1841
    Number of pages4
    JournalNuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
    Volume268
    Issue number11-12
    DOIs
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed

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    Keywords

    • Beryllium
    • Deuterium
    • Micro-beam
    • Nuclear reaction analysis

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