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Tungsten migration studies by controlled injection of volatile compounds
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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2013 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 438, S170-S174 p.Article in journal (Refereed) Published
Abstract [en]

Volatile tungsten hexa-fluoride was locally injected into the TEXTOR tokamak as a marker for material migration studies. The injection was accompanied by puffing N-15 rare isotope as a nitrogen tracer in discharges with edge cooling by impurity seeding. The objective was to assess material balance by qualitative and quantitative determination of a global and local deposition pattern, material mixing effects and fluorine residence in plasma-facing components. Spectroscopy and ex situ ion beam analysis techniques were used. Tungsten was detected on all types of limiter tiles and short-term probes retrieved from the vessel. Over 80% of the injected W was identified. The largest tungsten concentration, 1 x 10(18) cm(-2), was in the vicinity of the gas inlet. Co-deposits contained tungsten and a mix of light isotopes: H, D, He-4, B-10, B-11, C-12, C-13, N-14, N-15, O-16 and small quantities of F-19 thus showing that both He and nitrogen are trapped following wall conditioning (He glow) and edge cooling.

Place, publisher, year, edition, pages
2013. Vol. 438, S170-S174 p.
Keyword [en]
Plasma-Facing Components, High Heat-Flux, Asdex Upgrade, Test-Limiters, Textor Tokamak, Fusion Devices, Wall Project, Erosion, Performance, Coatings
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-142605DOI: 10.1016/j.jnucmat.2013.01.053ISI: 000330795300027ScopusID: 2-s2.0-84885481688OAI: diva2:703585
20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices (PSI), May 21-25, 2012, Aachen, Germany

QC 20140307

Available from: 2014-03-07 Created: 2014-03-07 Last updated: 2014-03-07Bibliographically approved

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