Feasibility of arc-discharge and plasma-sputtering methods in cleaning plasma-facing and diagnostics components of fusion reactors

Antti Hakola (Corresponding Author), Jari Likonen, Juuso Karhunen, Juuso T. Korhonen, Märt Aints, Matti Laan, Peeter Paris, Jukka Kolehmainen, Mika Koskinen, Sanna Tervakangas

    Research output: Contribution to journalArticleScientificpeer-review

    7 Citations (Scopus)

    Abstract

    We have studied the feasibility of arc-discharge and plasma-sputtering methods in removing deposited layers from ITER-relevant test samples. Prototype devices have been designed and constructed for the experiments and the cleaning process is monitored by a spectral detection system. The present version of the arc-discharge device is capable of removing 1-µm thick layers from 350-mm2 areas in 4-8 s, but due to the increased roughness of the cleaned surfaces and signs of local melting, mirror-like surfaces cannot be treated by this technique. The plasma-sputtering approach, for its part, is some 5-10 times slower in removing the deposited layers but no changes in surface roughness or morphology of the samples could be observed after the cleaning phase. The arc-discharge technique could therefore be used for rapid cleaning of plasma-facing components during maintenance shutdowns of ITER while in the case of diagnostics mirrors plasma sputtering is preferred.
    Original languageEnglish
    Pages (from-to)101-106
    JournalFusion Engineering and Design
    Volume96-97
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed
    Event28th Symposium on Fusion Technology, SOFT 2014 - San Sebastián, Spain
    Duration: 29 Sep 20143 Oct 2014
    Conference number: 28

    Keywords

    • arc discharge
    • cleaning rate
    • diagnostics mirror
    • ITER
    • plasma sputtering
    • plasma-facing component

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