Tritium Distribution in JT-60U W-shaped Divertor
K. Masaki1, K. Sugiyama2 T. Tanabe2, Y. Gotoh1, K. Miyasaka2, K. Tobita1, Y. Miyo1, K. Kaminaga1, K. Kodama1, T. Arai1, N. Miya1
1. Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, 801 Mukouyama, Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
2. Nagoya University, Center for Integrated Research in Science and Engineering, Furo-cho,Chikusa-ku, Nagoya 464-8603, Japan
Abstract.
Detailed tritium profiles on the JT-60U W-shaped divertor and the first wall tiles were examined by tritium imaging plate technique (TIPT) and full combustion method. The highest tritium level (60 kBq/cm2) was observed at the dome top tiles. The tritium level of the divertor target was lower (2 kBq/cm2). The result of the triton deposition simulation using orbit following Monte-Carlo code was consistent with the tritium distribution obtained by TIPT and full combustion method. These results indicate that the tritium distribution of the JT-60U W-shaped divertor reflects mainly the distribution of the energetic triton impinging on the wall. According to the simulation, the tritium produced by D-D nuclear reaction in JT-60U is implanted deeply to the wall without fully losing the initial energy of 1 MeV.