Tritium analysis of divertor tiles used in JET ITER-like wall campaigns by means of ß-ray induced x-ray spectrometry

Y. Hatano, K. Yumizuru, S. Koivuranta, J. Likonen, M. Hara, M. Matsuyama, S. Masuzaki, M. Tokitani, N. Asakura, K. Isobe, T. Hayashi, A. Baron-Wiechec, A. Widdowson, JET contributors

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    Abstract

    Energy spectra of β-ray induced x-rays from divertor tiles used in ITER-like wall campaigns of the Joint European Torus were measured to examine tritium (T) penetration into tungsten (W) layers. The penetration depth of T evaluated from the intensity ratio of W(Lα) x-rays to W(Mα) x-rays showed clear correlation with poloidal position; the penetration depth at the upper divertor region reached several micrometers, while that at the lower divertor region was less than 500 nm. The deep penetration at the upper part was ascribed to the implantation of high energy T produced by DD fusion reactions. The poloidal distribution of total x-ray intensity indicated higher T retention in the inboard side than the outboard side of the divertor region.

    Original languageEnglish
    Article number014014
    JournalPhysica Scripta
    Issue numberT170
    DOIs
    Publication statusPublished - 1 Dec 2017
    MoE publication typeA1 Journal article-refereed

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    Keywords

    • nuclear fusion
    • tritium
    • divertor
    • retention
    • tungsten
    • implantation
    • Joint European Torus

    Cite this

    Hatano, Y., Yumizuru, K., Koivuranta, S., Likonen, J., Hara, M., Matsuyama, M., Masuzaki, S., Tokitani, M., Asakura, N., Isobe, K., Hayashi, T., Baron-Wiechec, A., Widdowson, A., & contributors, JET. (2017). Tritium analysis of divertor tiles used in JET ITER-like wall campaigns by means of ß-ray induced x-ray spectrometry. Physica Scripta, (T170), [014014]. https://doi.org/10.1088/1402-4896/aa8931