Laser-assisted cleaning of beryllium-containing mirror samples from JET and PISCES-B

M Wisse (Corresponding Author), L Marot, A Widdowson, M Rubel, D Ivanova, P Petersson, R P Doerner, M J Baldwin, Jari Likonen, E Alves, Antti Hakola, Seppo Koivuranta, R Steiner, E Meyer

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    Abstract

    A set of seven polycrystalline mirror samples retrieved from the JET tokamak has been cleaned in vacuum using a pulsed laser system. The surfaces of samples exposed to plasma during 2008-2009 campaigns as part of the second phase of a comprehensive first mirror test contained a mixture of carbon, beryllium and tritium. For this reason, the samples were treated in a vacuum chamber constructed specially for this purpose. In some cases mirrors show an increase of the specular reflectivity after cleaning, though beryllium and carbon deposits were not fully removed. Additionally, three samples coated in PISCES-B with a 110-120 nm beryllium layer were subjected to laser cleaning tests as well
    Original languageEnglish
    Pages (from-to)122-130
    Number of pages8
    JournalFusion Engineering and Design
    Volume89
    Issue number2
    DOIs
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed

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    Keywords

    • Beryllium
    • first mirrors
    • ITER
    • laser cleaning

    Cite this

    Wisse, M., Marot, L., Widdowson, A., Rubel, M., Ivanova, D., Petersson, P., Doerner, R. P., Baldwin, M. J., Likonen, J., Alves, E., Hakola, A., Koivuranta, S., Steiner, R., & Meyer, E. (2014). Laser-assisted cleaning of beryllium-containing mirror samples from JET and PISCES-B. Fusion Engineering and Design, 89(2), 122-130. https://doi.org/10.1016/j.fusengdes.2014.01.042