Thermo-oxidation and analysis of JET codeposits

A. A. Haasz (Corresponding Author), Jari Likonen, J. P. Coad, C. K. Tsui, J. W. Davis, A. M. Widdowson

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    Abstract

    Following the thermo-oxidation study of D removal from JET divertor codeposits, post oxidation surface analyses were performed using SIMS, NRA and profilometry. The analysis confirms that the D content was reduced by at least an order of magnitude after 8-h oxidation at 623 K (350 °C) and 21 kPa (160 Torr) O2 pressure – in agreement with TDS measurements. The codeposits studied contain Be and C. Those on the vertical tile surfaces have a duplex structure with a C-D rich layer on the surface and a Be–C layer underneath; during oxidation the outer layer is removed and the inner layer remains. Codeposits with low Be content from the shadowed area have single-layer structures; during oxidation their thicknesses were reduced by about an order of magnitude. For the JET codeposits studied (with Be/C up to ∼1) it appears that Be does not affect the oxidative removal of deuterium from the codeposit in a significant way.
    Original languageEnglish
    Pages (from-to)626-630
    Number of pages5
    JournalJournal of Nuclear Materials
    Volume390-391
    DOIs
    Publication statusPublished - 2009
    MoE publication typeA1 Journal article-refereed

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    Haasz, A. A., Likonen, J., Coad, J. P., Tsui, C. K., Davis, J. W., & Widdowson, A. M. (2009). Thermo-oxidation and analysis of JET codeposits. Journal of Nuclear Materials, 390-391, 626-630. https://doi.org/10.1016/j.jnucmat.2009.01.303