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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

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 ∼40 µm 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 ∼10 µm 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
StatePublished - Aug 2017
Externally publishedYes

Keywords

  • Deposition
  • Erosion
  • Fuel retention
  • JET

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