Development of Bending Proton Beam Radiography

研制了高灵敏度、高分辨率的实时质子放射成像系统。当工作流体为不透明流体且测试截面为金属材料时，不能使用光学方法对沸腾气泡进行可视化。由于高速事件，如沸腾气泡的行为，用x射线或中子束很难可视化。在这种情况下，质子x线摄影可能是有用的。因为质子放射照相依赖于质子的电离功率随距离接近其范围的终点而迅速变化，并与高通量的质子束一起使用。本文研究了弯曲质子束放射成像技术对由多弯弯曲毛细血管隧道组成的平板热管中沸腾气泡等动态事件的可视化。应用质子束射线照相的方向或垂直于重力方向或平行于重力方向。采用13hey的单色质子束。试验段用约10^<11>粒子/cm^2的质子束辐照。在平板加热器上进行A，然后在试验段附近的荧光屏上对沸腾气泡进行质子射线照相。高速摄像机记录的气泡图像。

High sensitive and high resolution real-time proton radiography system has been developed. When an opaque fluid is used as a working fluid and the test section is made of metal, optical method cannot be used for the visualization of the boiling bubbles. It has been difficult to visualize with X-ray or neutron beams because of the high speed events such as behaviors of boiling bubbles. In these case, it may be expected that proton radiography is useful. Because proton radiography is depends on the rapid change of ionizing power of proton with distance near the end of their range and is used with a high flux of proton beams. In the study, the visualization of the dynamic events such as boiling bubbles in a flat plate heat pipe made of many turns of meandering capillaries tunnel was investigated by using bending proton beam radiography. The direction of the applied proton beam radiography was either perpendicular or parallel to the direction of gravity.The monochromatic proton beam of 13 Hey was used. Test section were irradiated with proton beam flux of about 10^<11> particles/cm^2.a on a flat plat heater and then proton radiography of boiling bubbles were taken on the fluorescent screen near by the test section. Images of bubbles recorded with the high speed video camera.