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, Seppo Koivuranta, Jari Likonen, M. Hara, M. Matsuyama, S. Masuzaki, M. Tokitani, N. Asakura, K. Isobe, T. Hayashi, A. Baron-Wiechec, A. Widdowson, JET Contributors

    Research output: Contribution to journalArticleScientificpeer-review

    10 Citations (Scopus)

    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

    Funding

    This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 under grant agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. The study was supported by JSPS KAKENHI Grant No. 26289353, the ITER Broader Approach Activities, and the National Institute for Fusion Research (NIFS) as a part of PWI Collaboration.

    Keywords

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

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