Assessment of Cleaning Methods for First Mirrors Tested in JET for ITER

D. Ivanova, Jari Likonen, A. Widdowson, J.P. Coad, M. Rubel, G. De Temmerman, JET-EFDA Contributors

    Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review


    Two cleaning techniques were used for removal of co-deposits from the tested first mirrors exposed in JET: (a) ultrasonic bath; (b) a broad range of polishing conditions from manual buffing to machine polishing with the diamond grain size of up to 3 μm.
    Reflectivity measurements were performed after each step in the cleaning procedure. Surfaces were also examined with electron microscopy and ion beam analysis methods. Ultrasonic cleaning leads to partial recovery of reflectivity due to enhanced detachment of deposits.
    Typically 30–50% of the original reflectivity was recovered in the visible light and 50–90% in the infrared region. One mirror was cleaned completely.
    Polishing with diamond paste may lead to successful removal of deposits but the damage to the surface in case of the large diamond grains was observed.
    Recovery of up to 100% of the initial reflectivity was achieved for some mirrors.
    Original languageEnglish
    Pages (from-to)Paper P3-094
    JournalJournal of Nuclear Materials
    Issue numberSupplement
    Publication statusPublished - 2012
    MoE publication typeA4 Article in a conference publication
    Event20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices - Aachen, Aachen, Germany
    Duration: 21 May 201225 May 2012


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