Repetitive Flash X-Ray Generator Utilizing a High-Impedance Triode with a Cylinder-Shaped Graphite Cathode

概要

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A method for generating repetitive flash x rays using a compact cold-cathode triode in conjunction with a two-stage Marx pulser is described. This flash x-ray generator consisted of the following essential components: a high-voltage power supply with a maximum voltage of 100 kV, an energy storage condenser of 97 nF, a modified two-stage Marx pulser with a capacity during the main discharge of 425 pF, a turbo molecular pump, a triggering circuit, and a flash x-ray tube. The two ceramic condensers were charged from 40 to 60 kV, and the output voltages from the high-voltage pulser were about 1.9 times the charged voltage. The x-ray tube was of the triode type which was connected to the turbo molecu1ar pump with a pressure of 6.7×10-4 Pa and consisted of the following major devices: a rod-shaped long anode tip made of tungsten, a ring-shaped trigger electrode made of brass, a cylindershaped cathode electrode made of graphite, and an acrylate resin tube body. The durations of the flash x-ray pulses were about 1μs, and the x-ray intensity with a charged voltage of 60 kV was about.79μC/kg at 0.5m per pulse. The repetitive rate(stable region)was less than 20Hz, and the maximu0m size of the focal spot was equivalent to the anode diameter of 3.0 mm.
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