TY - JOUR
T1 - Deuterium retention in the divertor tiles of JET ITER-Like wall
AU - Lahtinen, A.
AU - Likonen, Jari
AU - Koivuranta, Seppo
AU - Hakola, Antti
AU - Heinola, A.
AU - Ayres, C.F.
AU - Baron-Wiechec, A.
AU - Coad, J.P.
AU - Widdowson, A.
AU - Räisänen, J.
AU - JET Contributors
N1 - Funding Information:
This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014–2018 under grant agreement No 633053 . The views and opinions expressed herein do not necessarily reflect those of the European Commission.
Publisher Copyright:
© 2017 The Authors
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
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
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 - Article
SN - 2352-1791
VL - 12
SP - 655
EP - 661
JO - Nuclear Materials and Energy
JF - Nuclear Materials and Energy
T2 - 22nd International Conference on Plasma-Surface Interactions in Controlled Fusion Devices (PSI-22)
Y2 - 30 May 2016 through 3 June 2016
ER -