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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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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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.

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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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SP - 655

EP - 661

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

SN - 2352-1791

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