Deuterium retention in the divertor tiles of JET ITER-Like wall

A. Lahtinen, J. Likonen, S. Koivuranta, A. Hakola, A. Heinola, C.F. Ayres, A. Baron-Wiechec, J.P. Coad, A. Widdowson, J. Räisänen

    Research output: Contribution to journalArticleScientificpeer-review

    7 Citations (Scopus)

    Abstract

    Divertor tiles removed after the second JET ITER-Like Wall campaign 2013-2014 (ILW-2) were studied using Secondary Ion Mass Spectrometry (SIMS). Measurements show that the thickest beryllium (Be) dominated deposition layers are located at the upper part of the inner divertor and are up to ~40µm thick at the lower part of Tile 0 exposed in 2011-2014. The highest deuterium (D) amounts (>8 · 1018 at./cm2), in contrast, were found on the upper part of Tile 1 (2013-2014), where the Be deposits are ~10µm thick. D was mainly retained in the near-surface layer of the Be deposits but also deeper in tungsten (W) and molybdenum (Mo) layers of the marker coated tiles, especially at W-Mo layer interfaces. D retention for the ILW-2 divertor tiles is higher than for the first campaign 2011-2012 (ILW-1) and probable reasons for the difference are that SIMS measurements for the ILW-2 samples were done deeper than for the ILW-1 samples, some of the tiles were exposed during both ILW-1 and ILW-2 and therefore had a longer exposure time, and the differences between ILW-1 and ILW-2 campaigns e.g. in strike point distributions and injected powers.
    Original languageEnglish
    Pages (from-to)655-661
    Number of pages7
    JournalNuclear Materials and Energy
    Volume12
    DOIs
    Publication statusPublished - 1 Aug 2017
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Deuterium
    tiles
    Tile
    deuterium
    Beryllium deposits
    beryllium
    Molybdenum
    Secondary ion mass spectrometry
    secondary ion mass spectrometry
    molybdenum
    deposits
    Beryllium
    Tungsten
    markers
    surface layers
    tungsten

    Keywords

    • JET
    • fuel retention
    • erosion
    • deposition

    Cite this

    Lahtinen, A. ; Likonen, J. ; Koivuranta, S. ; Hakola, A. ; Heinola, A. ; Ayres, C.F. ; Baron-Wiechec, A. ; Coad, J.P. ; Widdowson, A. ; Räisänen, J. / Deuterium retention in the divertor tiles of JET ITER-Like wall. In: Nuclear Materials and Energy. 2017 ; Vol. 12. pp. 655-661.
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    title = "Deuterium retention in the divertor tiles of JET ITER-Like wall",
    abstract = "Divertor tiles removed after the second JET ITER-Like Wall campaign 2013-2014 (ILW-2) were studied using Secondary Ion Mass Spectrometry (SIMS). Measurements show that the thickest beryllium (Be) dominated deposition layers are located at the upper part of the inner divertor and are up to ~40µm thick at the lower part of Tile 0 exposed in 2011-2014. The highest deuterium (D) amounts (>8 · 1018 at./cm2), in contrast, were found on the upper part of Tile 1 (2013-2014), where the Be deposits are ~10µm thick. D was mainly retained in the near-surface layer of the Be deposits but also deeper in tungsten (W) and molybdenum (Mo) layers of the marker coated tiles, especially at W-Mo layer interfaces. D retention for the ILW-2 divertor tiles is higher than for the first campaign 2011-2012 (ILW-1) and probable reasons for the difference are that SIMS measurements for the ILW-2 samples were done deeper than for the ILW-1 samples, some of the tiles were exposed during both ILW-1 and ILW-2 and therefore had a longer exposure time, and the differences between ILW-1 and ILW-2 campaigns e.g. in strike point distributions and injected powers.",
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    author = "A. Lahtinen and J. Likonen and S. Koivuranta and A. Hakola and A. Heinola and C.F. Ayres and A. Baron-Wiechec and J.P. Coad and A. Widdowson and J. R{\"a}is{\"a}nen",
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    Lahtinen, A, Likonen, J, Koivuranta, S, Hakola, A, Heinola, A, Ayres, CF, Baron-Wiechec, A, Coad, JP, Widdowson, A & Räisänen, J 2017, 'Deuterium retention in the divertor tiles of JET ITER-Like wall', Nuclear Materials and Energy, vol. 12, pp. 655-661. https://doi.org/10.1016/j.nme.2017.04.007

    Deuterium retention in the divertor tiles of JET ITER-Like wall. / Lahtinen, A.; Likonen, J.; Koivuranta, S.; Hakola, A.; Heinola, A.; Ayres, C.F.; Baron-Wiechec, A.; Coad, J.P.; Widdowson, A.; Räisänen, J.

    In: Nuclear Materials and Energy, Vol. 12, 01.08.2017, p. 655-661.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Deuterium retention in the divertor tiles of JET ITER-Like wall

    AU - Lahtinen, A.

    AU - Likonen, J.

    AU - Koivuranta, S.

    AU - Hakola, A.

    AU - Heinola, A.

    AU - Ayres, C.F.

    AU - Baron-Wiechec, A.

    AU - Coad, J.P.

    AU - Widdowson, A.

    AU - Räisänen, J.

    PY - 2017/8/1

    Y1 - 2017/8/1

    N2 - Divertor tiles removed after the second JET ITER-Like Wall campaign 2013-2014 (ILW-2) were studied using Secondary Ion Mass Spectrometry (SIMS). Measurements show that the thickest beryllium (Be) dominated deposition layers are located at the upper part of the inner divertor and are up to ~40µm thick at the lower part of Tile 0 exposed in 2011-2014. The highest deuterium (D) amounts (>8 · 1018 at./cm2), in contrast, were found on the upper part of Tile 1 (2013-2014), where the Be deposits are ~10µm thick. D was mainly retained in the near-surface layer of the Be deposits but also deeper in tungsten (W) and molybdenum (Mo) layers of the marker coated tiles, especially at W-Mo layer interfaces. D retention for the ILW-2 divertor tiles is higher than for the first campaign 2011-2012 (ILW-1) and probable reasons for the difference are that SIMS measurements for the ILW-2 samples were done deeper than for the ILW-1 samples, some of the tiles were exposed during both ILW-1 and ILW-2 and therefore had a longer exposure time, and the differences between ILW-1 and ILW-2 campaigns e.g. in strike point distributions and injected powers.

    AB - Divertor tiles removed after the second JET ITER-Like Wall campaign 2013-2014 (ILW-2) were studied using Secondary Ion Mass Spectrometry (SIMS). Measurements show that the thickest beryllium (Be) dominated deposition layers are located at the upper part of the inner divertor and are up to ~40µm thick at the lower part of Tile 0 exposed in 2011-2014. The highest deuterium (D) amounts (>8 · 1018 at./cm2), in contrast, were found on the upper part of Tile 1 (2013-2014), where the Be deposits are ~10µm thick. D was mainly retained in the near-surface layer of the Be deposits but also deeper in tungsten (W) and molybdenum (Mo) layers of the marker coated tiles, especially at W-Mo layer interfaces. D retention for the ILW-2 divertor tiles is higher than for the first campaign 2011-2012 (ILW-1) and probable reasons for the difference are that SIMS measurements for the ILW-2 samples were done deeper than for the ILW-1 samples, some of the tiles were exposed during both ILW-1 and ILW-2 and therefore had a longer exposure time, and the differences between ILW-1 and ILW-2 campaigns e.g. in strike point distributions and injected powers.

    KW - JET

    KW - fuel retention

    KW - erosion

    KW - deposition

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    U2 - 10.1016/j.nme.2017.04.007

    DO - 10.1016/j.nme.2017.04.007

    M3 - Article

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    EP - 661

    JO - Nuclear Materials and Energy

    JF - Nuclear Materials and Energy

    SN - 2352-1791

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