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Analyses of Hydrogen Isotope Distributions in the Outer Target Tile used in the W-shaped Divertor of JT-60U
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2004
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W-shaped DivertorEarth ScienceNuclear PhysicsEngineeringAccelerator Mass SpectrometryEnvironmental EngineeringOuter Target TileHydrogen IsotopesGeochemistryHydrogenHydrogen Isotope DistributionsTritium ProfileFusion Reactor MaterialNuclear EngineeringDial Gauge
Hydrogen isotope distributions of the outer divertor target CFC tile, in the W-shaped divertor of JT-60U where erosion dominated, were analyzed by secondary ion mass spectroscopy (SIMS) to study the correlation between the concentrations of hydrogen isotopes and erosion/deposition rate. The chemical states of the CFC tile surfaces were analyzed by x-ray photoelectron spectroscopy (XPS). The existence of re-deposition layers was observed by scanning electron microscope (SEM). The erosion/deposition depth was also evaluated by a surface profilometer, namely dial gauge. The hydrogen and deuterium retention profiles were compared with the tritium profile obtained by the tritium imaging plate technique (TIPT).