Development of real time measurement of dynamic hydrogen retention using spectroscopic method

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Real-time measurement system of deuterium permeation flux has been built. Using this system, the decrease in the deuterium permeation flux was observed during deuterium plasma irradiation to the tungsten sample with the thickness of 0.1 mm. This seems to be attributed to modification of the surface condition. It is found that optical reflectivity of a tungsten sample with 280 nm yttrium film and 20 nm palladium film was reversibly changed when hydrogen gas was supplied and pumped. Moreover, it was revealed that deuterium retention of a tungsten sample with grains of which elongation direction was perpendicular to the surface was 2～10 times higher than that of parallel elongation. This seems to be attributed to difference in the effective diffusion along the grain boundary.