Material mixing on plasma-facing components: Compound formation
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
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.
FUEL INVENTORY, TUNGSTEN COATINGS, LIMITERS, CODEPOSITION, RETENTION, BERYLLIUM, DIVERTOR, DEVICES, CARBON
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-25586DOI: 10.1016/j.jnucmat.2008.12.206ISI: 000266386900185ScopusID: 2-s2.0-64849101649OAI: oai:DiVA.org:kth-25586DiVA: diva2:370685
13th International Conference on Fusion Reactor Materials (ICFRM-13) Nice, FRANCE, DEC 10-14, 2007
QC 201011172012-01-262010-10-272012-02-22Bibliographically approved