Abstract
High power liquid metal targets for spallation neutron sources are being developed in the world. Mercury target has been installed at the Materials and Life-science Experimental Facility (MLF) in the Japan Proton Accelerator Research Complex, which will promote innovative science. At the moment of the proton beams bombard the target, pressure waves will be generated in the interface between liquid and solid metals due to the thermal shock.On the process of the pressure waves propagation, negative pressure induces the cavitation witch causes pitting damage on the inner surface of the target vessel. In the MLF, microbubbles injection into the flowing mercury is carrying out in order to mitigate the pressure waves. In this study, the effect of microbubbles on cavitation damage by microsecond-scale negative pressure was investigated through the vibratory horn tests in the bubbly water.
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