Mercury Cavitation Phenomenon in Pulsed Spallation Neutron Sources
- Japan Atomic Energy Agency Tokai-mura, Naka-gun, Ibaraki-ken, 319-1195 (Japan)
- KEK Tsukuba-shi, Ibaraki-ken, 305-0801 (Japan)
Innovative researches will be performed at Materials and Life Science Experimental Facility in J-PARC, in which a mercury target system will be installed as MW-class pulse spallation neutron sources. Proton beams will be injected into mercury target to induce the spallation reaction. At the moment the intense proton beam hits the target, pressure waves are generated in the mercury because of the abrupt heat deposition. The pressure waves interact with the target vessel leading to negative pressure that may cause cavitation along the vessel wall. Localized impacts by micro-jets and/or shock waves which are caused by cavitation bubble collapse impose pitting damage on the vessel wall. The pitting damage which degrades the structural integrity of target vessels is a crucial issue for high power mercury targets. Micro-gas-bubbles injection into mercury may be useful to mitigate the pressure wave and the pitting damage. The visualization of cavitation-bubble and gas-bubble collapse behaviors was carried out by using a high-speed video camera. The differences between them are recognized.
- OSTI ID:
- 21148817
- Journal Information:
- AIP Conference Proceedings, Vol. 1022, Issue 1; Conference: ISNA 18: 18. international symposium on nonlinear acoustics, Stockholm (Sweden), 7-10 Jul 2008; Other Information: DOI: 10.1063/1.2956185; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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