First results and surface analysis strategy for plasma-facing components after JET operation with the ITER-like wall

Jari Likonen, E. Alves, A. Baron-Wiechec, S. Brezinsek, J.P. Coad, Antti Hakola, K. Heinola, Seppo Koivuranta, G.F. Matthews, P. Petersson, M. Rubel, C. Stan-Sion, A. Widdowson, JET-EFDA Contributors

Research output: Contribution to journalArticleScientificpeer-review

21 Citations (Scopus)

Abstract

During the carbon wall operations of JET since 2001, an extensive post-mortem analysis programme has been carried out under the JET Task Force Fusion Technology and a similar analysis programme is underway for the JET-ILW tiles removed during the 2012 shutdown. The first post-mortem results from the JET ITER-like wall tiles have shown that the overall amount of deposition on the divertor tiles and on remote divertor areas has been reduced by more than an order of magnitude with respect to JET-C. In addition, the obtained data indicate a possible interaction between Be and W such as the formation of mixed Be-W layers. This could be due to the surface roughness of the tiles, or could be caused by diffusion or even alloying. Ion-beam analyses and secondary ion mass spectrometry techniques give only elemental information, so other techniques such as x-ray diffraction, x-ray photoelectron spectroscopy, secondary electron microscopy/energy dispersive x-ray spectroscopy and nuclear microprobing are required. Since the nature of deposition and erosion has changed during the JET-ILW operations, a change in the post-mortem analysis programme is needed. For example, no cross-sectional samples from the sloping parts of tiles 4 and 6 are required. A strategy for post-mortem analyses of the marker-coated tiles will be presented in this paper.
Original languageEnglish
Article number014016
Number of pages5
JournalPhysica Scripta
Issue numberT159
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

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tiles
Tile
Plasma
Program Analysis
X-ray Spectroscopy
x ray spectroscopy
shutdowns
Electron Microscopy
Erosion
Mass Spectrometry
Surface Roughness
X-ray Diffraction
markers
secondary ion mass spectrometry
alloying
erosion
Strategy
electron microscopy
Fusion
surface roughness

Cite this

Likonen, Jari ; Alves, E. ; Baron-Wiechec, A. ; Brezinsek, S. ; Coad, J.P. ; Hakola, Antti ; Heinola, K. ; Koivuranta, Seppo ; Matthews, G.F. ; Petersson, P. ; Rubel, M. ; Stan-Sion, C. ; Widdowson, A. ; Contributors, JET-EFDA. / First results and surface analysis strategy for plasma-facing components after JET operation with the ITER-like wall. In: Physica Scripta. 2014 ; No. T159.
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title = "First results and surface analysis strategy for plasma-facing components after JET operation with the ITER-like wall",
abstract = "During the carbon wall operations of JET since 2001, an extensive post-mortem analysis programme has been carried out under the JET Task Force Fusion Technology and a similar analysis programme is underway for the JET-ILW tiles removed during the 2012 shutdown. The first post-mortem results from the JET ITER-like wall tiles have shown that the overall amount of deposition on the divertor tiles and on remote divertor areas has been reduced by more than an order of magnitude with respect to JET-C. In addition, the obtained data indicate a possible interaction between Be and W such as the formation of mixed Be-W layers. This could be due to the surface roughness of the tiles, or could be caused by diffusion or even alloying. Ion-beam analyses and secondary ion mass spectrometry techniques give only elemental information, so other techniques such as x-ray diffraction, x-ray photoelectron spectroscopy, secondary electron microscopy/energy dispersive x-ray spectroscopy and nuclear microprobing are required. Since the nature of deposition and erosion has changed during the JET-ILW operations, a change in the post-mortem analysis programme is needed. For example, no cross-sectional samples from the sloping parts of tiles 4 and 6 are required. A strategy for post-mortem analyses of the marker-coated tiles will be presented in this paper.",
author = "Jari Likonen and E. Alves and A. Baron-Wiechec and S. Brezinsek and J.P. Coad and Antti Hakola and K. Heinola and Seppo Koivuranta and G.F. Matthews and P. Petersson and M. Rubel and C. Stan-Sion and A. Widdowson and JET-EFDA Contributors",
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year = "2014",
doi = "10.1088/0031-8949/2014/T159/014016",
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Likonen, J, Alves, E, Baron-Wiechec, A, Brezinsek, S, Coad, JP, Hakola, A, Heinola, K, Koivuranta, S, Matthews, GF, Petersson, P, Rubel, M, Stan-Sion, C, Widdowson, A & Contributors, JET-EFDA 2014, 'First results and surface analysis strategy for plasma-facing components after JET operation with the ITER-like wall', Physica Scripta, no. T159, 014016. https://doi.org/10.1088/0031-8949/2014/T159/014016

First results and surface analysis strategy for plasma-facing components after JET operation with the ITER-like wall. / Likonen, Jari; Alves, E.; Baron-Wiechec, A.; Brezinsek, S.; Coad, J.P.; Hakola, Antti; Heinola, K.; Koivuranta, Seppo; Matthews, G.F.; Petersson, P.; Rubel, M.; Stan-Sion, C.; Widdowson, A.; Contributors, JET-EFDA.

In: Physica Scripta, No. T159, 014016, 2014.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - First results and surface analysis strategy for plasma-facing components after JET operation with the ITER-like wall

AU - Likonen, Jari

AU - Alves, E.

AU - Baron-Wiechec, A.

AU - Brezinsek, S.

AU - Coad, J.P.

AU - Hakola, Antti

AU - Heinola, K.

AU - Koivuranta, Seppo

AU - Matthews, G.F.

AU - Petersson, P.

AU - Rubel, M.

AU - Stan-Sion, C.

AU - Widdowson, A.

AU - Contributors, JET-EFDA

N1 - Project code: 85724

PY - 2014

Y1 - 2014

N2 - During the carbon wall operations of JET since 2001, an extensive post-mortem analysis programme has been carried out under the JET Task Force Fusion Technology and a similar analysis programme is underway for the JET-ILW tiles removed during the 2012 shutdown. The first post-mortem results from the JET ITER-like wall tiles have shown that the overall amount of deposition on the divertor tiles and on remote divertor areas has been reduced by more than an order of magnitude with respect to JET-C. In addition, the obtained data indicate a possible interaction between Be and W such as the formation of mixed Be-W layers. This could be due to the surface roughness of the tiles, or could be caused by diffusion or even alloying. Ion-beam analyses and secondary ion mass spectrometry techniques give only elemental information, so other techniques such as x-ray diffraction, x-ray photoelectron spectroscopy, secondary electron microscopy/energy dispersive x-ray spectroscopy and nuclear microprobing are required. Since the nature of deposition and erosion has changed during the JET-ILW operations, a change in the post-mortem analysis programme is needed. For example, no cross-sectional samples from the sloping parts of tiles 4 and 6 are required. A strategy for post-mortem analyses of the marker-coated tiles will be presented in this paper.

AB - During the carbon wall operations of JET since 2001, an extensive post-mortem analysis programme has been carried out under the JET Task Force Fusion Technology and a similar analysis programme is underway for the JET-ILW tiles removed during the 2012 shutdown. The first post-mortem results from the JET ITER-like wall tiles have shown that the overall amount of deposition on the divertor tiles and on remote divertor areas has been reduced by more than an order of magnitude with respect to JET-C. In addition, the obtained data indicate a possible interaction between Be and W such as the formation of mixed Be-W layers. This could be due to the surface roughness of the tiles, or could be caused by diffusion or even alloying. Ion-beam analyses and secondary ion mass spectrometry techniques give only elemental information, so other techniques such as x-ray diffraction, x-ray photoelectron spectroscopy, secondary electron microscopy/energy dispersive x-ray spectroscopy and nuclear microprobing are required. Since the nature of deposition and erosion has changed during the JET-ILW operations, a change in the post-mortem analysis programme is needed. For example, no cross-sectional samples from the sloping parts of tiles 4 and 6 are required. A strategy for post-mortem analyses of the marker-coated tiles will be presented in this paper.

U2 - 10.1088/0031-8949/2014/T159/014016

DO - 10.1088/0031-8949/2014/T159/014016

M3 - Article

JO - Physica Scripta

JF - Physica Scripta

SN - 0031-8949

IS - T159

M1 - 014016

ER -