LIBS study of ITER relevant tungsten–oxygen coatings exposed to deuterium plasma in Magnum-PSI

I. Jõgi, P. Paris, M. Laan, J. Kozlova, H. Mändar, M. Passoni, D. Dellasega, A. Hakola, H. J. van der Meiden

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)

    Abstract

    We discuss the applicability of laser induced breakdown spectroscopy (LIBS) for deuterium retention analysis in compact and porous tungsten-oxide (W-O) coatings. Deuterium loading was performed by exposing the coatings to deuterium plasma in Magnum-PSI linear plasma device. The deuterium signals obtained by ex-situ LIBS had sufficiently good signal-to-noise ratio for reliable separation of essentially broadened hydrogen and deuterium lines as well as for comparison of the lateral and depth distributions of deuterium in the coatings. Strong deuterium signal was obtained for the first laser shot which corresponded to the surface layer of the W-O coatings whereas deeper in the coating the signal decreased to noise level. In addition, the deuterium signal was highest in the central region of compact W-O coating. For both coatings, depth profiles of elements obtained by LIBS match with those recorded by secondary ion mass spectroscopy (SIMS) in the lateral direction along the sample surface. The results of LIBS and SIMS results were supported by Scanning Electron Microscopy (SEM) and X-ray diffraction (XRD) data which showed that the exposure to deuterium plasma resulted in remarkable changes in the surface morphology along the sample surface. The study demonstrates the LIBS potential in deuterium retention measurements in plasma facing components.

    Original languageEnglish
    Article number152660
    JournalJournal of Nuclear Materials
    Volume544
    Early online date12 Nov 2020
    DOIs
    Publication statusPublished - Feb 2021
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Deuterium loading by Magnum-PSI plasma
    • Diagnostics by SEM
    • LIBS analysis of ITER relevant tungsten coatings
    • SIMS
    • XRD

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