Development of Bending Proton Beam Radiography

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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.