1. Deuterium depth profiling in graphite tiles not exposed to hydrogen discharges before air ventilation of JT-60U
- Author
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Hayashi, T., Sugiyama, K., Mayer, M., Krieger, K., Masaki, K., Tanabe, T., and Sato, M.
- Subjects
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GLOW discharges , *GRAPHITE , *DEUTERIUM , *ION traps , *NUCLEAR reactions , *SURFACES (Technology) , *TOKAMAKS ,DESIGN & construction - Abstract
Abstract: Depth profiles of deuterium trapped in graphite tiles not exposed to hydrogen discharges just before air ventilation of JT-60U were determined based on the D(3He,p)4He resonant nuclear reaction analysis. The samples were taken from the W-shaped divertor. The maximum depth of analysis is about 1.4×1024 carbon atoms/m2, corresponding to a linear depth of 16μm for the density of 1.7×103 kg/m3. The highest concentration (19at.%) was found at the surface of the inner divertor area, which was significantly higher than that exposed to H discharges at the same location. However in the deeper region, the deuterium concentrations without H discharges were lower than those with H discharges in 3 of 4 samples. These results indicate that hydrogen discharges can remove deuterium trapped only in the shallow region. [Copyright &y& Elsevier]
- Published
- 2009
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