Surface morphology of the bulk tungsten divertor tiles from JET ITER-like wall

J. E.T. Contributors; M. Tokitani; M. Miyamoto; S. Masuzaki; Y. Hatano; S. E. Lee; Y. Oya; T. Otsuka; M. Oyaidzu; H. Kurotaki; T. Suzuki; D. Hamaguchi; T. Hayashi; N. Asakura; A. Widdowson; S. Jachmich; M. Rubel

doi:10.1088/1402-4896/ab3d09

Surface morphology of the bulk tungsten divertor tiles from JET ITER-like wall

J. E.T. Contributors, M. Tokitani, M. Miyamoto, S. Masuzaki, Y. Hatano, S. E. Lee, Y. Oya, T. Otsuka, M. Oyaidzu, H. Kurotaki, T. Suzuki, D. Hamaguchi, T. Hayashi, N. Asakura, A. Widdowson, S. Jachmich, M. Rubel

Laboratory for Plasma Physics

Research output: Contribution to journal › Conference article › peer-review

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.

Original language	English
Article number	014010
Journal	Physica Scripta
Volume	2020
Issue number	T171
DOIs	https://doi.org/10.1088/1402-4896/ab3d09
Publication status	Published - 1 Jan 2020
Event	17th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2019 - Eindhoven, Netherlands Duration: 20 May 2019 → 24 May 2019

Keywords

Bulk tungsten divertor
Erosion and deposition
Jet-ilw
Micro-scale plastic deformation
Tritium

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10.1088/1402-4896/ab3d09

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Contributors, J. E. T., Tokitani, M., Miyamoto, M., Masuzaki, S., Hatano, Y., Lee, S. E., Oya, Y., Otsuka, T., Oyaidzu, M., Kurotaki, H., Suzuki, T., Hamaguchi, D., Hayashi, T., Asakura, N., Widdowson, A., Jachmich, S., & Rubel, M. (2020). Surface morphology of the bulk tungsten divertor tiles from JET ITER-like wall. Physica Scripta, 2020(T171), Article 014010. https://doi.org/10.1088/1402-4896/ab3d09

@article{6442d8f8594b432792a6647ca12d03f0,

title = "Surface morphology of the bulk tungsten divertor tiles from JET ITER-like wall",

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.",

keywords = "Bulk tungsten divertor, Erosion and deposition, Jet-ilw, Micro-scale plastic deformation, Tritium",

author = "Contributors, {J. E.T.} and M. Tokitani and M. Miyamoto and S. Masuzaki and Y. Hatano and Lee, {S. E.} and Y. Oya and T. Otsuka and M. Oyaidzu and H. Kurotaki and T. Suzuki and D. Hamaguchi and T. Hayashi and N. Asakura and A. Widdowson and S. Jachmich and M. Rubel",

note = "Publisher Copyright: {\textcopyright} EUROfusion, National Institute for Fusion Science.; 17th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2019 ; Conference date: 20-05-2019 Through 24-05-2019",

year = "2020",

month = jan,

day = "1",

doi = "10.1088/1402-4896/ab3d09",

language = "English",

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journal = "Physica Scripta",

issn = "0031-8949",

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Contributors, JET, Tokitani, M, Miyamoto, M, Masuzaki, S, Hatano, Y, Lee, SE, Oya, Y, Otsuka, T, Oyaidzu, M, Kurotaki, H, Suzuki, T, Hamaguchi, D, Hayashi, T, Asakura, N, Widdowson, A, Jachmich, S & Rubel, M 2020, 'Surface morphology of the bulk tungsten divertor tiles from JET ITER-like wall', Physica Scripta, vol. 2020, no. T171, 014010. https://doi.org/10.1088/1402-4896/ab3d09

TY - JOUR

T1 - Surface morphology of the bulk tungsten divertor tiles from JET ITER-like wall

AU - Contributors, J. E.T.

AU - Tokitani, M.

AU - Miyamoto, M.

AU - Masuzaki, S.

AU - Hatano, Y.

AU - Lee, S. E.

AU - Oya, Y.

AU - Otsuka, T.

AU - Oyaidzu, M.

AU - Kurotaki, H.

AU - Suzuki, T.

AU - Hamaguchi, D.

AU - Hayashi, T.

AU - Asakura, N.

AU - Widdowson, A.

AU - Jachmich, S.

AU - Rubel, M.

PY - 2020/1/1

Y1 - 2020/1/1

N2 - 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.

AB - 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.

KW - Bulk tungsten divertor

KW - Erosion and deposition

KW - Jet-ilw

KW - Micro-scale plastic deformation

KW - Tritium

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U2 - 10.1088/1402-4896/ab3d09

DO - 10.1088/1402-4896/ab3d09

M3 - Conference article

AN - SCOPUS:85084650525

SN - 0031-8949

VL - 2020

JO - Physica Scripta

JF - Physica Scripta

IS - T171

M1 - 014010

T2 - 17th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2019

Y2 - 20 May 2019 through 24 May 2019

ER -

Surface morphology of the bulk tungsten divertor tiles from JET ITER-like wall

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Keywords

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