First Mirrors Test in JET for ITER: An overview of optical performance and surface morphology

M. Rubel (Corresponding Author), J. P. Coad, G. De Temmerman, Antti Hakola, D. Hole, Jari Likonen, I. Uytdenhouwen, A. Widdowson

    Research output: Contribution to journalArticleScientificpeer-review

    13 Citations (Scopus)

    Abstract

    Metallic mirrors will be essential components of all optical systems for plasma diagnosis in ITER. A comprehensive First Mirror Test (FMT) has been carried out in the JET tokamak. The exposure was followed by a characterisation of mirrors and their carriers. The main results obtained by optical and surface analysis methods are: (i) reflectivity of all tested mirrors is degraded either by erosion with charge exchange neutrals or by the formation of thick deposits; (ii) deuterium and carbon are the main elements detected on all mirror surfaces and the presence of beryllium is also found in several cases; (iii) thick deposits show columnar structure; (iv) bubble-like structures are detected in deposits; their formation is a probable reason for deposits' disintegration and peeling-off; (v) the deposition in channels in the divertor cassettes is pronounced at the very entrance and then it sharply decreases with the distance from the plasma, ?5-7 mm.
    Original languageEnglish
    Pages (from-to)818-822
    JournalNuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
    Volume623
    Issue number2
    DOIs
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Surface morphology
    Mirrors
    Deposits
    mirrors
    deposits
    Plasmas
    Peeling
    Disintegration
    Beryllium
    Surface analysis
    Deuterium
    peeling
    Optical systems
    Chemical elements
    disintegration
    Erosion
    beryllium
    charge exchange
    entrances
    erosion

    Keywords

    • Diagnostic mirrors
    • Erosion and deposition
    • ITER
    • JET
    • Reflectivity
    • Surface analysis

    Cite this

    @article{f731b5c90a794cb8b53a5e7ad3481eee,
    title = "First Mirrors Test in JET for ITER: An overview of optical performance and surface morphology",
    abstract = "Metallic mirrors will be essential components of all optical systems for plasma diagnosis in ITER. A comprehensive First Mirror Test (FMT) has been carried out in the JET tokamak. The exposure was followed by a characterisation of mirrors and their carriers. The main results obtained by optical and surface analysis methods are: (i) reflectivity of all tested mirrors is degraded either by erosion with charge exchange neutrals or by the formation of thick deposits; (ii) deuterium and carbon are the main elements detected on all mirror surfaces and the presence of beryllium is also found in several cases; (iii) thick deposits show columnar structure; (iv) bubble-like structures are detected in deposits; their formation is a probable reason for deposits' disintegration and peeling-off; (v) the deposition in channels in the divertor cassettes is pronounced at the very entrance and then it sharply decreases with the distance from the plasma, ?5-7 mm.",
    keywords = "Diagnostic mirrors, Erosion and deposition, ITER, JET, Reflectivity, Surface analysis",
    author = "M. Rubel and Coad, {J. P.} and {De Temmerman}, G. and Antti Hakola and D. Hole and Jari Likonen and I. Uytdenhouwen and A. Widdowson",
    year = "2010",
    doi = "10.1016/j.nima.2010.01.069",
    language = "English",
    volume = "623",
    pages = "818--822",
    journal = "Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",
    issn = "0168-9002",
    publisher = "Elsevier",
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    }

    First Mirrors Test in JET for ITER : An overview of optical performance and surface morphology. / Rubel, M. (Corresponding Author); Coad, J. P.; De Temmerman, G.; Hakola, Antti; Hole, D.; Likonen, Jari; Uytdenhouwen, I.; Widdowson, A.

    In: Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 623, No. 2, 2010, p. 818-822.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - First Mirrors Test in JET for ITER

    T2 - An overview of optical performance and surface morphology

    AU - Rubel, M.

    AU - Coad, J. P.

    AU - De Temmerman, G.

    AU - Hakola, Antti

    AU - Hole, D.

    AU - Likonen, Jari

    AU - Uytdenhouwen, I.

    AU - Widdowson, A.

    PY - 2010

    Y1 - 2010

    N2 - Metallic mirrors will be essential components of all optical systems for plasma diagnosis in ITER. A comprehensive First Mirror Test (FMT) has been carried out in the JET tokamak. The exposure was followed by a characterisation of mirrors and their carriers. The main results obtained by optical and surface analysis methods are: (i) reflectivity of all tested mirrors is degraded either by erosion with charge exchange neutrals or by the formation of thick deposits; (ii) deuterium and carbon are the main elements detected on all mirror surfaces and the presence of beryllium is also found in several cases; (iii) thick deposits show columnar structure; (iv) bubble-like structures are detected in deposits; their formation is a probable reason for deposits' disintegration and peeling-off; (v) the deposition in channels in the divertor cassettes is pronounced at the very entrance and then it sharply decreases with the distance from the plasma, ?5-7 mm.

    AB - Metallic mirrors will be essential components of all optical systems for plasma diagnosis in ITER. A comprehensive First Mirror Test (FMT) has been carried out in the JET tokamak. The exposure was followed by a characterisation of mirrors and their carriers. The main results obtained by optical and surface analysis methods are: (i) reflectivity of all tested mirrors is degraded either by erosion with charge exchange neutrals or by the formation of thick deposits; (ii) deuterium and carbon are the main elements detected on all mirror surfaces and the presence of beryllium is also found in several cases; (iii) thick deposits show columnar structure; (iv) bubble-like structures are detected in deposits; their formation is a probable reason for deposits' disintegration and peeling-off; (v) the deposition in channels in the divertor cassettes is pronounced at the very entrance and then it sharply decreases with the distance from the plasma, ?5-7 mm.

    KW - Diagnostic mirrors

    KW - Erosion and deposition

    KW - ITER

    KW - JET

    KW - Reflectivity

    KW - Surface analysis

    U2 - 10.1016/j.nima.2010.01.069

    DO - 10.1016/j.nima.2010.01.069

    M3 - Article

    VL - 623

    SP - 818

    EP - 822

    JO - Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

    JF - Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

    SN - 0168-9002

    IS - 2

    ER -