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Material mixing on plasma-facing components: Compound formation
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0001-9901-6296
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
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2009 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 386-388, 740-743 p.Article in journal (Refereed) Published
Abstract [en]

Two different tungsten limiters (castellated bulk metal block and W-coated graphite), subjected to high power loads in the TEXTOR tokamak, were examined in order to determine chemical composition of deposits inside the castellated grooves and on side surfaces of the coated limiter. Comprehensive analyses carried out by X-ray diffraction, ion beam analysis and other methods revealed: (i) the formation of tungsten oxide (WO2) inside the castellated grooves: (ii) the formation of tungsten carbides (WC main phase and traces of W2C) on side surfaces of the coated limiter. Elemental tungsten was found in deposits on side surfaces only in trace quantities thus indicating that tungsten eroded from the limiter top and transported to the scrape-off layer reacted with carbon. Based on thermodynamic data, the pathways leading to the formation of compounds are discussed.

Place, publisher, year, edition, pages
Elsevier, 2009. Vol. 386-388, 740-743 p.
Keyword [en]
FUEL INVENTORY, TUNGSTEN COATINGS, LIMITERS, CODEPOSITION, RETENTION, BERYLLIUM, DIVERTOR, DEVICES, CARBON
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-25586DOI: 10.1016/j.jnucmat.2008.12.206ISI: 000266386900185Scopus ID: 2-s2.0-64849101649OAI: oai:DiVA.org:kth-25586DiVA: diva2:370685
Conference
13th International Conference on Fusion Reactor Materials (ICFRM-13) Nice, FRANCE, DEC 10-14, 2007
Note
QC 20101117Available from: 2012-01-26 Created: 2010-10-27 Last updated: 2017-12-12Bibliographically approved

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Rubel, Marek J.

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