Plasma cleaning of beryllium coated mirrors

L. Moser (Corresponding Author), L. Marot, R. Steiner, M. Newman, A. Widdowson, D. Ivanova, J. Likonen, P. Petersson, G. Pintsuk, M. Rubel, E. Meyer, JET Contributors

    Research output: Contribution to journalArticleScientificpeer-review

    8 Citations (Scopus)

    Abstract

    Cleaning systems of metallic first mirrors are needed in more than 20 optical diagnostic systems from ITER to avoid reflectivity losses. Currently, plasma sputtering is considered as one of the most promising techniques to remove deposits coming from the main wall (mainly beryllium and tungsten). This work presents the results of plasma cleaning of rhodium and molybdenum mirrors exposed in JET-ILW and contaminated with typical tokamak elements (including beryllium and tungsten). Using radio frequency (13.56 MHz) argon or helium plasma, the removal of mixed layers was demonstrated and mirror reflectivity improved towards initial values. The cleaning was evaluated by performing reflectivity measurements, scanning electron microscopy, x-ray photoelectron spectroscopy and ion beam analysis.
    Original languageEnglish
    Number of pages6
    JournalPhysica Scripta
    Volume2016
    Issue numberT167
    DOIs
    Publication statusPublished - 2016
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Cleaning
    Reflectivity
    beryllium
    cleaning
    Mirror
    Plasma
    mirrors
    reflectance
    tungsten
    helium plasma
    Sputtering
    X-ray Spectroscopy
    argon plasma
    Scanning Electron Microscopy
    rhodium
    x ray spectroscopy
    molybdenum
    Diagnostics
    radio frequencies
    sputtering

    Cite this

    Moser, L., Marot, L., Steiner, R., Newman, M., Widdowson, A., Ivanova, D., ... Contributors, JET. (2016). Plasma cleaning of beryllium coated mirrors. Physica Scripta, 2016(T167). https://doi.org/10.1088/0031-8949/T167/1/014069
    Moser, L. ; Marot, L. ; Steiner, R. ; Newman, M. ; Widdowson, A. ; Ivanova, D. ; Likonen, J. ; Petersson, P. ; Pintsuk, G. ; Rubel, M. ; Meyer, E. ; Contributors, JET. / Plasma cleaning of beryllium coated mirrors. In: Physica Scripta. 2016 ; Vol. 2016, No. T167.
    @article{f2d65cc661ec4b7d8c5d7f4c8ef9a4e3,
    title = "Plasma cleaning of beryllium coated mirrors",
    abstract = "Cleaning systems of metallic first mirrors are needed in more than 20 optical diagnostic systems from ITER to avoid reflectivity losses. Currently, plasma sputtering is considered as one of the most promising techniques to remove deposits coming from the main wall (mainly beryllium and tungsten). This work presents the results of plasma cleaning of rhodium and molybdenum mirrors exposed in JET-ILW and contaminated with typical tokamak elements (including beryllium and tungsten). Using radio frequency (13.56 MHz) argon or helium plasma, the removal of mixed layers was demonstrated and mirror reflectivity improved towards initial values. The cleaning was evaluated by performing reflectivity measurements, scanning electron microscopy, x-ray photoelectron spectroscopy and ion beam analysis.",
    author = "L. Moser and L. Marot and R. Steiner and M. Newman and A. Widdowson and D. Ivanova and J. Likonen and P. Petersson and G. Pintsuk and M. Rubel and E. Meyer and JET Contributors",
    note = "Project code: 104445",
    year = "2016",
    doi = "10.1088/0031-8949/T167/1/014069",
    language = "English",
    volume = "2016",
    journal = "Physica Scripta",
    issn = "0031-8949",
    publisher = "Institute of Physics IOP",
    number = "T167",

    }

    Moser, L, Marot, L, Steiner, R, Newman, M, Widdowson, A, Ivanova, D, Likonen, J, Petersson, P, Pintsuk, G, Rubel, M, Meyer, E & Contributors, JET 2016, 'Plasma cleaning of beryllium coated mirrors', Physica Scripta, vol. 2016, no. T167. https://doi.org/10.1088/0031-8949/T167/1/014069

    Plasma cleaning of beryllium coated mirrors. / Moser, L. (Corresponding Author); Marot, L.; Steiner, R.; Newman, M.; Widdowson, A.; Ivanova, D.; Likonen, J.; Petersson, P.; Pintsuk, G.; Rubel, M.; Meyer, E.; Contributors, JET.

    In: Physica Scripta, Vol. 2016, No. T167, 2016.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Plasma cleaning of beryllium coated mirrors

    AU - Moser, L.

    AU - Marot, L.

    AU - Steiner, R.

    AU - Newman, M.

    AU - Widdowson, A.

    AU - Ivanova, D.

    AU - Likonen, J.

    AU - Petersson, P.

    AU - Pintsuk, G.

    AU - Rubel, M.

    AU - Meyer, E.

    AU - Contributors, JET

    N1 - Project code: 104445

    PY - 2016

    Y1 - 2016

    N2 - Cleaning systems of metallic first mirrors are needed in more than 20 optical diagnostic systems from ITER to avoid reflectivity losses. Currently, plasma sputtering is considered as one of the most promising techniques to remove deposits coming from the main wall (mainly beryllium and tungsten). This work presents the results of plasma cleaning of rhodium and molybdenum mirrors exposed in JET-ILW and contaminated with typical tokamak elements (including beryllium and tungsten). Using radio frequency (13.56 MHz) argon or helium plasma, the removal of mixed layers was demonstrated and mirror reflectivity improved towards initial values. The cleaning was evaluated by performing reflectivity measurements, scanning electron microscopy, x-ray photoelectron spectroscopy and ion beam analysis.

    AB - Cleaning systems of metallic first mirrors are needed in more than 20 optical diagnostic systems from ITER to avoid reflectivity losses. Currently, plasma sputtering is considered as one of the most promising techniques to remove deposits coming from the main wall (mainly beryllium and tungsten). This work presents the results of plasma cleaning of rhodium and molybdenum mirrors exposed in JET-ILW and contaminated with typical tokamak elements (including beryllium and tungsten). Using radio frequency (13.56 MHz) argon or helium plasma, the removal of mixed layers was demonstrated and mirror reflectivity improved towards initial values. The cleaning was evaluated by performing reflectivity measurements, scanning electron microscopy, x-ray photoelectron spectroscopy and ion beam analysis.

    U2 - 10.1088/0031-8949/T167/1/014069

    DO - 10.1088/0031-8949/T167/1/014069

    M3 - Article

    VL - 2016

    JO - Physica Scripta

    JF - Physica Scripta

    SN - 0031-8949

    IS - T167

    ER -

    Moser L, Marot L, Steiner R, Newman M, Widdowson A, Ivanova D et al. Plasma cleaning of beryllium coated mirrors. Physica Scripta. 2016;2016(T167). https://doi.org/10.1088/0031-8949/T167/1/014069