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In a mercury target installed in a neutron scattering facility, pressure waves are induced by rapid heat deposition due to the injection of MW-class pulsed proton beam. It has been analytieally reported that the pressure waves impose large loads on the target vessel wall (structural body) and the negative (tensile) pressure is generated near the target beam window by coupled behavior between the deformation of the structural body and liquid mercury. The negative pressure may cause a cavitation bubble and the bubble collapse may cause damages such as pitting on the beam window. Impact tests were carried out by using the cylinder vessel filled with water to examine the coupled behavior between the structural body and liquid under impact loading. The thickness of a simulated beam window (the structural body) set on the bottom of the cylinder vessel and the impact velocity were varied to investigate conditions for the negative pressure-wave generation. The thinner the thickness and the higher the impact velocity, the negative pressures generate more readily because of the inertia effect of the deformed beam window by impact pressure. Additionally, FEM analyses were carried out to investigate the behavior of interface between the structural body and liquid.
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