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ELM-induced arcing on tungsten fuzz in the COMPASS divertor region
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SYSNO ASEP 0475064 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title ELM-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, ORCIDSource Title Journal of Nuclear Materials. - : Elsevier - ISSN 0022-3115
Roč. 492, August (2017), s. 204-212Number of pages 9 s. Publication form Print - P Action PSI 2016 - 22nd International Conference on Plasma Surface Interactions in Controlled Fusion Devices/22./ Event date 30.05.2016 - 03.06.2016 VEvent location Roma Country IT - Italy Event type WRD Language eng - English Country NL - Netherlands Keywords tungsten fuzz ; arcing ; COMPASS tokamak ; plasma-material interaction Subject RIV JF - Nuclear Energetics OECD category Nuclear related engineering Subject RIV - cooperation Institute of Physics - Nuclear Energetics R&D Projects GA14-12837S GA ČR - Czech Science Foundation (CSF) GA15-10723S GA ČR - Czech Science Foundation (CSF) LM2015045 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2011026 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFP-V - RVO:61389021 ; FZU-D - RVO:68378271 UT WOS 000404701300027 EID SCOPUS 85020043775 DOI 10.1016/j.jnucmat.2017.05.032 Annotation Materials 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.
Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2018
Number of the records: 1