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

    Keywords

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

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