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(EX/P2-11) Tritium Distribution on Plasma Facing Graphite Tiles of JT-60U

T. Tanabe¹⁾, K. Sugiyama¹⁾, K. Masaki²⁾, Y. Gotoh²⁾, K. Tobita²⁾, N. Miya^2)
 
1) Center for Integrated Research Science and Engineering, Nagoya University, Nagoya, Japan
²⁾ Japan Atomic Energy Research Institute, Naka, Japan

Abstract.  Tritium areal distributions on graphite divertor tiles, dome units and baffle plates of JT-60U were successfully measured for the first time with using tritium imaging plate technique. Tritium distributions observed in JT-60U tiles can be explained by implantation of energy tritium, because tritium was produced by the D-D nuclear reaction. Accordingly, toroidal distribution shows the periodic structure reflecting the ripple loss of the magnetic field. The tritium distribution on the divertor tiles is modified by redeposited layers and redistributed by the temperature increase due to plasma heat load.

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