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Plasma-wall interaction on the divertor tiles of JET ITER-like wall from the viewpoint of micro/nanoscopic observations
Natl Inst Fus Sci, 322-6 Oroshi, Toki, Gifu 5095292, Japan..
Shimane Univ, Matsue, Shimane 6908504, Japan..
Natl Inst Fus Sci, 322-6 Oroshi, Toki, Gifu 5095292, Japan..
Natl Inst Fus Sci, 322-6 Oroshi, Toki, Gifu 5095292, Japan..
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2018 (English)In: Fusion engineering and design, ISSN 0920-3796, E-ISSN 1873-7196, Vol. 136, p. 199-204Article in journal (Refereed) Published
Abstract [en]

Micro/nanoscopic observations on the surface of the divertor tiles used in the first campaign (2011-2012) of the JET tokamak with ITER-like Wall (JET ILW) have been carried out by means of several material analysis techniques. Previous results from the inner divertor were reported for a single poloidal section of the tile numbers 1, 3 and 4, i.e., upper, vertical and horizontal targets, respectively. The formation of the thick stratified mixed-material deposition layer on tiles 1 and 4, and erosion on tile 3 were identified. This study is mostly focused on the outer divertor: tiles 6, 7 and 8. In contrast to the inner tile, remarkable surface modifications have not been observed on the vertical target (tiles 7 and 8) where sputtering erosion and impurity deposition would have been almost balanced. Only a specific part of tile 6 (horizontal target) located near the exhaust channel was covered with a stratified ("geological-like") mixed-material deposition layer which mainly included Be and Ni with the thickness of similar to 2 mu m. Special feature of this mixed layer was that a certain amount of nitrogen (N) was clearly detected in the layer. Since the concentration of N varied with the depth position, it could be depended on the amount of that gas puffed for plasma edge cooling during the JET experimental campaign. In addition to the outer divertor tiles, a very interesting feature of the local erosion and deposition effects is reported in this paper.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 136, p. 199-204
Keywords [en]
JET-ILW, Divertor, Erosion-deposition, Fuel inventory
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-240779DOI: 10.1016/j.fusengdes.2018.01.051ISI: 000452583700038Scopus ID: 2-s2.0-85041200889OAI: oai:DiVA.org:kth-240779DiVA, id: diva2:1277424
Conference
13th International Symposium on Fusion Nuclear Technology (ISFNT), SEP 25-29, 2017, Kyoto, Japan
Note

QC 20190110

Available from: 2019-01-10 Created: 2019-01-10 Last updated: 2019-01-10Bibliographically approved

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Rubel, Marek

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