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Micro-/nano-characterization of the surface structures on the divertor tiles from JET ITER-like wall
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2017 (English)In: Fusion engineering and design, ISSN 0920-3796, E-ISSN 1873-7196, Vol. 116, p. 1-4Article in journal (Refereed) Published
Abstract [en]

Micro-/nano-characterization of the surface structures on the divertor tiles used in the first campaign (2011–2012) of the JET tokamak with the ITER-like wall (JET ILW) were studied. The analyzed tiles were a single poloidal section of the tile numbers of 1, 3 and 4, i.e., upper, vertical and horizontal targets, respectively. A sample from the apron of Tile 1 was deposition-dominated. Stratified mixed-material layers composed of Be, W, Ni, O and C were deposited on the original W-coating. Their total thickness was ∼1.5 μm. By means of transmission electron microscopy, nano-size bubble-like structures with a size of more than 100 nm were identified in that layer. They could be related to deuterium retention in the layer dominated by Be. The surface microstructure of the sample from Tile 4 also showed deposition: a stratified mixed-material layer with the total thickness of 200–300 nm. The electron diffraction pattern obtained with transmission electron microscope indicated Be was included in the layer. No bubble-like structures have been identified. The surface of Tile 3, originally coated by Mo, was identified as the erosion zone. This is consistent with the fact that the strike point was often located on that tile during the plasma operation. The study revealed the micro- and nano-scale modification of the inner tile surface of the JET ILW. In particular, a complex mixed-material deposition layer could affect hydrogen isotope retention and dust formation.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 116, p. 1-4
Keywords [en]
Deposition, Erosion, JET ILW divertor, TEM observation
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-200982DOI: 10.1016/j.fusengdes.2017.01.002Scopus ID: 2-s2.0-85010207316OAI: oai:DiVA.org:kth-200982DiVA, id: diva2:1072521
Note

QC 20170208

Available from: 2017-02-08 Created: 2017-02-07 Last updated: 2017-11-29Bibliographically approved

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  • apa
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