Počet záznamů: 1
The occurrence and damage of unipolar arcing on fuzzy tungsten
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SYSNO ASEP 0450903 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název The occurrence and damage of unipolar arcing on fuzzy tungsten Tvůrce(i) 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)Zdroj.dok. Journal of Nuclear Materials. - : Elsevier - ISSN 0022-3115
Roč. 463, August (2015), s. 303-307Poč.str. 5 s. Forma vydání Tištěná - P Akce PLASMA-SURFACE INTERACTIONS 21: International Conference on Plasma-Surface Interactions in Controlled Fusion Devices Datum konání 26.05.2014-30.05.2014 Místo konání Kanazawa Země JP - Japonsko Typ akce WRD Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova Tungsten ; fuzz ; unipolar arcing ; melting ; fusion reactor Vědní obor RIV JF - Jaderná energetika Obor OECD Nuclear related engineering CEP GA14-12837S GA ČR - Grantová agentura ČR Institucionální podpora UFP-V - RVO:61389021 UT WOS 000358467200057 EID SCOPUS 84937713116 DOI 10.1016/j.jnucmat.2014.09.009 Anotace 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. Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2016
Počet záznamů: 1