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Surface morphology of the bulk tungsten divertor tiles from JET ITER-like wall
Natl Inst Nat Sci, Natl Inst Fus Sci, Toki, Gifu 5095292, Japan..
Shimane Univ, Matsue, Shimane 6908504, Japan..
Natl Inst Nat Sci, Natl Inst Fus Sci, Toki, Gifu 5095292, Japan..
Univ Toyama, Toyama 9308555, Japan..
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2020 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. T171, no 1, article id 014010Article in journal (Refereed) Published
Abstract [en]

Surface characterization of bulk tungsten tiles (W lamellae) used during the first campaign of JET with the ITER-Like Wall (JET-ILW) was performed by means of microscopy and tritium imaging techniques. This is the first report regarding very detailed structural studies of W lamellae from the JET-ILW divertor. A special feature of the W lamellae installed in JET is the intrinsic network of micro-cracks detected on surfaces of the as-manufactured material. Analyses of different W lamellae samples on the plasma-facing surface reveal two types of surface structures caused by plasma impact: areas with strong erosion and regions of mild plasma interaction. In regions of strong erosion, a thin modified layer (thickness of similar to 20 nm) with a high density of defects including bubble-like structures has been formed. In addition, features indicating melting along edges of micro-cracks with the micro-scale plastic deformation have been identified.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2020. Vol. T171, no 1, article id 014010
Keywords [en]
JET-ILW, bulk tungsten divertor, erosion and deposition, micro-scale plastic deformation, tritium
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-271962DOI: 10.1088/1402-4896/ab3d09ISI: 000520000600010Scopus ID: 2-s2.0-85084650525OAI: oai:DiVA.org:kth-271962DiVA, id: diva2:1423336
Note

QC 20200414

Available from: 2020-04-14 Created: 2020-04-14 Last updated: 2020-05-25Bibliographically approved

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Rubel, Marek

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