Assessment of cleaning methods for first mirrors tested in JET for ITER

JET-EFDA collaborators

    Research output: Contribution to journalArticleScientificpeer-review

    5 Citations (Scopus)

    Abstract

    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)S1241-S1244
    Number of pages4
    JournalJournal of Nuclear Materials
    Volume438
    Issue numberSupplement
    DOIs
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed
    Event20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices - Aachen, Aachen, Germany
    Duration: 21 May 201225 May 2012

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    cleaning
    Diamond
    Cleaning
    polishing
    mirrors
    reflectance
    Diamonds
    Deposits
    diamonds
    deposits
    Polishing
    Buffing
    Polishing machines
    recovery
    ultrasonic cleaning
    Ultrasonic cleaning
    Recovery
    Ointments
    detachment
    Ion beams

    Cite this

    JET-EFDA collaborators. / Assessment of cleaning methods for first mirrors tested in JET for ITER. In: Journal of Nuclear Materials. 2013 ; Vol. 438, No. Supplement. pp. S1241-S1244.
    @article{656bb05b9bf34a0f883bc95a0b231144,
    title = "Assessment of cleaning methods for first mirrors tested in JET for ITER",
    abstract = "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.",
    author = "D. Ivanova and A. Widdowson and Jari Likonen and L. Marot and Seppo Koivuranta and J.P. Coad and M. Rubel and P. Petersson and {De Temmerman}, G. and {JET-EFDA collaborators}",
    year = "2013",
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    language = "English",
    volume = "438",
    pages = "S1241--S1244",
    journal = "Journal of Nuclear Materials",
    issn = "0022-3115",
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    }

    Assessment of cleaning methods for first mirrors tested in JET for ITER. / JET-EFDA collaborators.

    In: Journal of Nuclear Materials, Vol. 438, No. Supplement, 2013, p. S1241-S1244.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Assessment of cleaning methods for first mirrors tested in JET for ITER

    AU - Ivanova, D.

    AU - Widdowson, A.

    AU - Likonen, Jari

    AU - Marot, L.

    AU - Koivuranta, Seppo

    AU - Coad, J.P.

    AU - Rubel, M.

    AU - Petersson, P.

    AU - De Temmerman, G.

    AU - JET-EFDA collaborators

    PY - 2013

    Y1 - 2013

    N2 - 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.

    AB - 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.

    U2 - 10.1016/j.jnucmat.2013.01.275

    DO - 10.1016/j.jnucmat.2013.01.275

    M3 - Article

    VL - 438

    SP - S1241-S1244

    JO - Journal of Nuclear Materials

    JF - Journal of Nuclear Materials

    SN - 0022-3115

    IS - Supplement

    ER -