Generation of High-Intensity Flash X Rays Utilizing a Surface-Discharge Radiation Tube in Conjunction with a Large Capacity Condenser

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The constructions and the fundamental studies for the high-intensity flash x-ray generator utilizing a surface-discharge radiation tube in conjunction with a large capacity condenser are described. This generator consisted of the following essential components: a high-voltage power supply, a coaxial oil condenser of 199 nF, a turbo molecular pump, a trigger device for the surface-discharge cathode, and an x-ray tube. The x-ray tube was of the demountable-type which was connected to a turbo molecular lecular pump operated at a pressure of 1.3×10-3 Pa and consisted of the following major devices: a rod-shaped long anode tip made of tungsten, a surface-discharge cathode made from a ferrite plate, and a tube body made of stainless steel. The high-voltage condenser was charged from 30 to 50 kV, and the electric charges in the condenser were discharged to the x-ray tube when a surface discharge was caused on the ferrite cathode by the triggering. The maximum tube voltage was equivalent to the initial charged voltage, and both the maximum current and the current duration with a charged voltage of 50 kV were 13kA and 40μs, respectively. The pulse widths of the flash x rays were less than 3μs, and the maximum x-ray intensity was about 6μC/kg at 1.0m per pulse.
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