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The occurrence and damage of unipolar arcing on fuzzy tungsten
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SYSNO ASEP 0450903 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The occurrence and damage of unipolar arcing on fuzzy tungsten Author(s) Aussems, D.U.B. (NL)
Nishijima, D. (US)
Brandt, C. (US)
van der Meiden, H.J. (NL)
Vilémová, Monika (UFP-V) RID, ORCID
Matějíček, Jiří (UFP-V) RID, ORCID
De Temmerman, G. (NL)
Doerner, R.P. (US)
Lopes Cardozo, N.J. (NL)Source Title Journal of Nuclear Materials. - : Elsevier - ISSN 0022-3115
Roč. 463, August (2015), s. 303-307Number of pages 5 s. Publication form Print - P Action PLASMA-SURFACE INTERACTIONS 21: International Conference on Plasma-Surface Interactions in Controlled Fusion Devices Event date 26.05.2014-30.05.2014 VEvent location Kanazawa Country JP - Japan Event type WRD Language eng - English Country NL - Netherlands Keywords Tungsten ; fuzz ; unipolar arcing ; melting ; fusion reactor Subject RIV JF - Nuclear Energetics OECD category Nuclear related engineering R&D Projects GA14-12837S GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 UT WOS 000358467200057 EID SCOPUS 84937713116 DOI 10.1016/j.jnucmat.2014.09.009 Annotation This research investigated whether unipolar arcing in the divertor of fusion reactors is a potential cause for enhanced wear of the divertor. It was found that 1 μm of nano-fuzz growth is sufficient to initiate arcing, mainly depending on the sheath potential drop and electron density. The average mass loss rate induced by the arc was determined from mass loss measurements and found to be consistent with the value estimated from the arc current. The average arc track erosion depth was estimated by using the measured mass loss and damaged surface area and was found to be one tenth of the fuzzy layer thickness. Due to melting of the fuzzy structures the actual depth is larger and some arc tracks occasionally appeared to even reach the bulk beyond the fuzzy layer. The conclusion of this study is therefore that arcing in the divertor of future tokamaks (e.g. ITER) potentially is an important cause for surface damage and plasma pollution. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2016
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