Glass-Enclosed Cold-Cathode Diode Drivenby a Repetitive Two-Stage Marx Pulser

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The fundamental studies of the repetitive type of flash x-ray generator utilizing an enclosedtype diode with a ring-shaped graphite cathode for soft radiography are described. This generator consisted of the following essential components: a constant high-voltage power supply, an energy storage condenser of 97 nF, a high-voltage pulser with a repetitive trigger device, and a flash x-ray tube. The pulser employed a modified two-stage Marx circuit with a capacity during main discharge of 425 pF. The x-ray tube was of the enclosed-diode type and consisted of the following major devices: a rodshaped anode tip made of tungsten, a ring-shaped cathode made of graphite, an x-ray window made of beryllium, a spattering shield made of stainless steel, and a tube body made of glass. The two condensers in the pulser were charged from 50 to 70 kV, and the output voltages were about 1.8 times the charged voltages. Both the peak tube voltage and the peak tube current increased according to increases in the condenser charged voltage, and the maximum values of the voltage and the current were about 80 kV and 0.6 kA, respectively. The pulse widths were less than 100 ns, and the maximum xray intensity was about 1.0μC/kg at 0.5 m per pulse. The repetitien rate(frequency)was less than 20Hz, and the maximum size of the focal spot was nearly equivalent to the anode diameter of 3.0 mm.
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