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Surface Distribution of Tritium on Graphite Tiles of Divertor Area in JT-60U

T. Tanabe, K. Miyasaka, K. Sugiyama, K. Masaki, K. Kodama, N. Miya

Fusion Science and Technology / Volume 41 / Number 3P2 / May 2002 / Pages 877-881

Material Interaction and Permeation / Proceedings of the Sixth International Conference on Tritium Science and Technology Tsukuba, Japan November 12-16, 2001 /

Tritium distributions on the graphite tiles used as plasma facing tiles in divertor tiles, dome units, and the baffle plates of JT-60U were successfully measured. The highest tritium level was found at the top of the dome or the private region and the outer baffle plates, where the plasma did not hit but the distance from the plasma was the shortest. For the divertor tiles, the tritium retention was very small. Such tritium distribution observed in JT-60U tiles can be well explained by the homogeneous implantation of rather high energy tritium and thermal release due to the heat load.

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