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Local migration studies of high-Z metals in the TEXTOR tokamak
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
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2016 (English)In: Physica Scripta, Institute of Physics Publishing (IOPP), 2016, no T167Conference paper (Refereed)Text
Abstract [en]

Volatile compounds of tungsten (WF6) and molybdenum (MoF6) were used as tracers of high-Z metal migration in the TEXTOR tokamak in several gas injection experiments when puffing was done through a test limiter. The experiments with W were performed prior to major shut-downs, while the MoF6 injection was followed by the final shutdown in connection with TEXTOR decommissioning. In all cases a set of surface probes and limiter tiles was retrieved and analysed with electron and ion beam techniques. The focus was on the local deposition in the vicinity of the gas inlet and in the inlet system. Depth profiles in the deposits and metal distribution maps clearly show that only near the gas inlet significant are amounts of Mo deposited along the scrape-off layer flow and E B drift directions, which could be reproduced by ERO-code modelling. Correlation between the injection scenario and the deposition patterns is presented.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2016. no T167
Keyword [en]
erosion-deposition, molybdenum, nitrogen, TEXTOR, tracer materials, tungsten, Deposition, Ion beams, Petroleum deposits, Tokamak devices, Tungsten compounds, Volatile organic compounds, Deposition patterns, Erosion deposition, Ion beam technique, Metal distributions, Metal migrations, Volatile compounds, Magnetoplasma
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-188329DOI: 10.1088/0031-8949/T167/1/014058ScopusID: 2-s2.0-84959870422OAI: oai:DiVA.org:kth-188329DiVA: diva2:936224
Conference
15th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2015, 18 May 2015 through 22 May 2015
Note

QC 20160613

Available from: 2016-06-13 Created: 2016-06-09 Last updated: 2016-06-13Bibliographically approved

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Weckmann, ArminPetersson, PerRubel, Marek
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