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Microanalysis of deposited layers in the inner divertor of JET with ITER-like wall
Royal Inst Technol, Sch Elect Engn, Dept Fus Plasma Phys, S-10405 Stockholm, Sweden..
Royal Inst Technol, Sch Elect Engn, Dept Fus Plasma Phys, S-10405 Stockholm, Sweden..
Royal Inst Technol, Sch Elect Engn, Dept Fus Plasma Phys, S-10405 Stockholm, Sweden..
Royal Inst Technol, Sch Elect Engn, Dept Fus Plasma Phys, S-10405 Stockholm, Sweden..
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2017 (English)In: NUCLEAR MATERIALS AND ENERGY, ISSN 2352-1791, Vol. 12, no SI, p. 412-417Article in journal (Refereed) Published
Abstract [en]

In JET with ITER-like wall, beryllium eroded in the main chamber is transported to the divertor and deposited mainly at the horizontal surfaces of tiles 1 and 0 (high field gap closure, HFGC). These surfaces are tungsten coated carbon fibre composite (CFC). Surface sampleswere collected following the plasma operations in 2011-2012 and 2013-2014 respectively. The surfaces, as well as polished cross sections of the deposited layers at the surfaces have been studied with micro ion beam analysis methods (mu-IBA). Deposition of Beand other impurities, and retention of D is microscopically inhomogeneous. Impurities and trapped deuterium accumulate preferentially in cracks, pits and depressed regions, and at the sides of large pits in the substrate (e.g. arc tracks where the W coating has been removed). With careful overlaying of mu-NRA elemental maps with optical microscopy images, it is possible to separate surface roughness effects from depth profiles at microscopically flat surface regions.

Place, publisher, year, edition, pages
2017. Vol. 12, no SI, p. 412-417
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Subatomic Physics
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URN: urn:nbn:se:uu:diva-344535DOI: 10.1016/j.nme.2017.02.015ISI: 000417293300062OAI: oai:DiVA.org:uu-344535DiVA, id: diva2:1188412
Available from: 2018-03-07 Created: 2018-03-07 Last updated: 2018-03-07Bibliographically approved

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