Abstract
A repetitive flash x-ray generator utilizing a disk-cathode radiation tube is described. This generator consisted of the following essential components: a high voltage power supply, an energy storage condenser, a repetitive type of modified Blumlein pulser, a turbo molecular pump, and a flash x-ray tube. This high-voltage pulser consisted of the following major devices: two ceramic condensers with capacities of 85OpF, a gas gap switch driven by electric field distortion, and a coil. The two condensers were charged from -50 to -70kV, and the total capacity during main discharge was 425pF. The peak voltages of the pulser output were about -1. 4 times the condenser charged voltage. The flash x-ray tube consisted of the following major devices: a rod-shaped anode tip made of tungsten, a disk cathode made of graphite, a spattering shield, and a tube body made of acrylate resin. The anode-cathode (A-C) space was regulated from the outside of the x-ray tube by rotating the anode rod. The maximum values of the tube voltage and the current were about 80kV and 1. 2kA, respectively. The maximum pulse width was about lOOns, and the x-ray intensity was less than lpC/kg at 0. 3m per pulse. The repetition frequency was less than 50Hz, and the maximum focal spot size was equivalent to the anode diameter of 3. 0mm.
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