F113 自然放出による X 線の増幅と応用

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The characteristics of a new quasi-x-ray laser generator and its application to quasi-monochromatic radiography are described. The generator employs a high-voltage power supply, a low-impedance coaxial transmission line, a high-voltage condenser with a capacity of about 200 nF, a turbo-molecular pump, a thyratron pulse generator as a trigger device, and a new plasma flash x-ray tube. The high-voltage main condenser is charged up to 60 kV by the power supply, and the electric charges in the condenser are discharged to the tube after triggering the cathode electrode. The flash x-rays are then produced. The x-ray tube is of a demountable triode that is connected to the turbo molecular pump with a pressure of approximately 1 mPa. As the electron flows from the cathode electrode are roughly converged to the silver target by the electric field in the tube, the plasma x-ray source, which consists of metal ions and electrons, forms by the target evaporating. Both the tube voltage and current displayed damped oscillations, and their peak values increased according to increases in the charging voltage. In the present work, the peak tube voltage was almost equal to the initial charging voltage of the main condenser, and the peak current was about 25 kA with a charging voltage of 60 kV. When the charging voltage was increased, the linear plasma x-ray source formed, and the characteristic x-ray intensities of K-series lines increased. The high-speed radiography was performed by the delayed radiography in conjunction with a new computed radiography system, and stop-motion images of bubbles caused by the underwater spark discharge were clearly observed.
日本流体力学会の論文
2002-07-23

F113 自然放出による X 線の増幅と応用

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