Tritium distributions on W-coated divertor tiles used in the third JET ITER-like wall campaign

Hatano, Y.; Lee, S. E.; Likonen, J.; Koivuranta, S.; Hara, M.; Masuzaki, S.; Asakura, N.; Isobe, K.; Hayashi, T.; Ikonen, J.; Widdowson, A.

doi:10.1016/j.nme.2019.01.001

Title: Tritium distributions on W-coated divertor tiles used in the third JET ITER-like wall campaign

Journal Article · 16 January 2019 · Nuclear Materials and Energy

DOI: https://doi.org/10.1016/j.nme.2019.01.001 · OSTI ID:1502353

Hatano, Y. ^[1]; Lee, S. E. ^[1]; Likonen, J. ^[2]; Koivuranta, S. ^[2];

^[1]; Masuzaki, S. ^[3]; Asakura, N. ^[4]; Isobe, K. ^[4]; Hayashi, T. ^[4];

^[5]; Widdowson, A. ^[6]

Univ. of Toyama, Gofuku (Japan)
VTT Technical Research Centre of Finland, Espoo (Finland)
National Inst. for Fusion Science (NIFS), Toki (Japan)
National Inst. for Quantum and Radiological Science and Technology, Rokkasho (Japan)
Univ. of Helsinki (Finland)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)

Tritium (T) distributions on tungsten (W)-coated plasma-facing tiles used in the third ITER-like wall campaign (2015–2016) of the Joint European Torus (JET) were examined by means of an imaging plate technique and β-ray induced x-ray spectrometry, and they were compared with the distributions after the second (2013–2014) campaign. Strong enrichment of T in beryllium (Be) deposition layers was observed after the second campaign. In contrast, T distributions after the third campaign was more uniform though Be deposition layers were visually recognized. The one of the possible explanations is enhanced desorption of T from Be deposition layers due to higher tile temperatures caused by higher energy input in the third campaign.

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Research Organization:: Culham Science Centre, Abingdon (United Kingdom); Univ. of Helsinki (Finland); Univ. of Toyama, Gofuku (Japan); National Inst. for Fusion Science (NIFS), Toki (Japan)