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ELM-induced arcing on tungsten fuzz in the COMPASS divertor region

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    SYSNO ASEP0475064
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleELM-induced arcing on tungsten fuzz in the COMPASS divertor region
    Author(s) Matějíček, Jiří (UFP-V) RID, ORCID
    Weinzettl, Vladimír (UFP-V) RID, ORCID
    Vilémová, Monika (UFP-V) RID, ORCID
    Morgan, T.W. (NL)
    De Temmerman, G. (FR)
    Dimitrova, Miglena (UFP-V) ORCID
    Cavalier, Jordan (UFP-V) RID, ORCID
    Adámek, Jiří (UFP-V) RID, ORCID
    Seidl, Jakub (UFP-V) RID
    Jäger, Aleš (FZU-D) RID, ORCID
    Source TitleJournal of Nuclear Materials. - : Elsevier - ISSN 0022-3115
    Roč. 492, August (2017), s. 204-212
    Number of pages9 s.
    Publication formPrint - P
    ActionPSI 2016 - 22nd International Conference on Plasma Surface Interactions in Controlled Fusion Devices/22./
    Event date30.05.2016 - 03.06.2016
    VEvent locationRoma
    CountryIT - Italy
    Event typeWRD
    Languageeng - English
    CountryNL - Netherlands
    Keywordstungsten fuzz ; arcing ; COMPASS tokamak ; plasma-material interaction
    Subject RIVJF - Nuclear Energetics
    OECD categoryNuclear related engineering
    Subject RIV - cooperationInstitute of Physics - Nuclear Energetics
    R&D ProjectsGA14-12837S GA ČR - Czech Science Foundation (CSF)
    GA15-10723S GA ČR - Czech Science Foundation (CSF)
    LM2015045 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    LM2011026 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    Institutional supportUFP-V - RVO:61389021 ; FZU-D - RVO:68378271
    UT WOS000404701300027
    EID SCOPUS85020043775
    AnnotationMaterials exposed to plasma may undergo various forms of surface modifications. Among the important phenomena for tungsten - as the prime candidate plasma-facing material for fusion devices e is a formation of helium-induced fibreform nanostructure, so-called tungsten fuzz. In this paper, we report direct observations of the interaction of the pre-prepared fuzzy tungsten surfaces with ELMy H-mode plasmas in the COMPASS tokamak as well as consequent ex-situ morphological analyses, with a particular focus on arcing as a potential erosion mechanism. Arcing events are documented from high-speed camera imaging. The sample surfaces are examined by scanning electron microscopy. Arc traces were observed on all samples, while their number was dependent on the sample position and orientation. Inside the arc traces, localized melting and densification of the original fuzz was observed, resulting in thickness reduction. The modified structure still retained some porosity and did not extend into the bulk.
    WorkplaceInstitute of Plasma Physics
    ContactVladimíra Kebza,, Tel.: 266 052 975
    Year of Publishing2018
Number of the records: 1