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Determination of tungsten sources in the JET-ILW divertor by spectroscopic imaging in the presence of a strong plasma continuum
KTH, School of Electrical Engineering and Computer Science (EECS), Fusion Plasma Physics. (Plasma-Wall Interactions)ORCID iD: 0000-0001-9299-3262
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2019 (English)In: Nuclear Materials and Energy, E-ISSN 2352-1791, Vol. 18, p. 118-124Article in journal (Refereed) Published
Abstract [en]

The identification of the sources of atomic tungsten and the measurement of their radiation distribution in front of all plasma-facing components has been performed in JET with the help of two digital cameras with the same two-dimensional view, equipped with interference filters of different bandwidths centred on the W I (400.88 nm) emission line. A new algorithm for the subtraction of the continuum radiation was successfully developed and is now used to evaluate the W erosion even in the inner divertor region where the strong recombination emission is dominating over the tungsten emission. Analysis of W sputtering and W redistribution in the divertor by video imaging spectroscopy with high spatial resolution for three different magnetic configurations was performed. A strong variation of the emission of the neutral tungsten in toroidal direction and corresponding W erosion has been observed. It correlates strongly with the wetted area with a maximal W erosion at the edge of the divertor tile.

Place, publisher, year, edition, pages
2019. Vol. 18, p. 118-124
National Category
Fusion, Plasma and Space Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:kth:diva-241901DOI: 10.1016/j.nme.2018.12.009ISI: 000460107500022Scopus ID: 2-s2.0-85058552880OAI: oai:DiVA.org:kth-241901DiVA, id: diva2:1282619
Conference
23rd Int. Conference on Plasma Surface Interactions in Controlled Fusion Devices
Note

QC 20190128

Available from: 2019-01-25 Created: 2019-01-25 Last updated: 2019-03-27Bibliographically approved

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