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Surfacemorphologyofthebulktungstendivertortiles fromJETITER‐likewall

Authors :
M.Tokitani
M.Miyamoto
S.Masuzaki
Y.Hatano
S.E., Lee
Y.Oya
T.Otsuka
Oyaizu, Makoto
Kurotaki, Hironori
T.Suzuki
Hamaguchi, Dai
Hayashi, Takumi
Asakura, Nobuyuki
A.Widdowson
S.Jachmich
M.Rubel
Makoto, Oyaizu
Hironori, Kurotaki
Dai, Hamaguchi
Takumi, Hayashi
Nobuyuki, Asakura
Source :
Physica Scripta. 2020(T171):014010
Publication Year :
2020

Abstract

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 ~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.

Details

Language :
English
ISSN :
00318949
Volume :
2020
Issue :
T171
Database :
OpenAIRE
Journal :
Physica Scripta
Accession number :
edsair.jairo.........b23edf6c94a7dd378f044e577ab27549