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

Y. Hatano (1) , S.E. Lee , J. Likonen , S. Koivuranta , M. Hara , S. Masuzaki (2) , N. Asakura , K. Isobe , T. Hayashi , J. Ikonen , A. Widdowson , Davide Galassi (3)

1 Advanced Science Research Center
2 NIFS - National Institute for Fusion Science
3 M2P2 - Laboratoire de Mécanique, Modélisation et Procédés Propres

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 beta-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.

Mots clés: Divertor; Tritium; Retention; Deposition; Radiation

Domaines: Mécanique des fluides [physics.class-ph]; Milieux fluides et réactifs

Y. Hatano, S.E. Lee, J. Likonen, S. Koivuranta, M. Hara, et al.. Tritium distributions on W-coated divertor tiles used in the third JET ITER-like wall campaign. Nuclear Materials and Energy, 2019, 18, pp.258-261. ⟨10.1016/j.nme.2019.01.001⟩. ⟨hal-02177095⟩