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

    22 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

    Fingerprint

    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.
    @article{04d182b95a0a4f88a8fb4fc3f4c29627,
    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",
    note = "Project code: 85724",
    year = "2014",
    doi = "10.1088/0031-8949/2014/T159/014016",
    language = "English",
    journal = "Physica Scripta",
    issn = "0031-8949",
    publisher = "Institute of Physics IOP",
    number = "T159",

    }

    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 -