| 摘要 |
Target cell of a neutron scattering device, containing liquid metal target material, has its beam window, through which proton beam enters, formed in a structure that is thin and yet can stand both pressure wave stress and thermal stress. In the target cell comprising an outer casing and an inner casing, both having a front face formed with the beam window, and being formed in a double structure of the outer casing and the inner casing with a predetermined distance maintained therebetween so that cooling medium is supplied there and target material is supplied into the inner casing, the beam window of the inner casing is made in a flat plate structure. By this flat plate structure, its rigidity is lowered and cell stress of a secondary stress character caused in the target cell by the pressure wave is reduced. Or, the beam window of the inner casing is formed to have a linear front face in the vertical section and a continuously curved front face in the horizontal section. Thereby, in the beam window of the inner casing, the pressure wave stress and the thermal stress are coped with by the linear front face and the continuously curved front face, respectively.
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