Abstract
Liquid mercury target system for high power spallation neutron sources is being developed. When high intensity proton beams are injected into the target, pressure waves are generated by thermal shock in mercury and cavitation damage will be imposed inside the target vessel. Injection of micro bubbles into the mercury is effective to mitigate the pressure waves. In the previous report, we proposed a method of fabricating a micro nozzle using powder metallurgy method. SUS316L and molybdenum powders were used as the nozzle matrix material. In a combination of molybdenum and quartz fiber, we had produced a straight hole with a circular cross-section, in which the diameter is approximately 100μm. In this work, experiment was carried out to observe the shape change of glass fiber against temperature. Quartz's phase changed from liquid to gas when heating between 1030℃ and 1875℃. This result shows that change of glass phase is an important factor for fabricating a hole.
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