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

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, K.

AU - Ayres, C. F.

AU - Baron-Wiechec, A.

AU - Coad, J. P.

AU - Widdowson, A.

AU - Räisänen, J.

N1 - Publisher Copyright: © 2017 The Authors

PY - 2017/8

Y1 - 2017/8

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 ∼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.

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 ∼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.

KW - Deposition

KW - Erosion

KW - Fuel retention

KW - JET

UR - http://www.scopus.com/inward/record.url?scp=85019466933&partnerID=8YFLogxK

U2 - 10.1016/j.nme.2017.04.007

DO - 10.1016/j.nme.2017.04.007

M3 - 文章

AN - SCOPUS:85019466933

SN - 2352-1791

VL - 12

SP - 655

EP - 661

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

ER -