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Abstract:
A pulsed X-ray tube is described which consists of a large-area (80-400 cm2) cold carbon felt cathode and a tantalum foil anode arranged in transmission geometry. It is driven by a Marx generator with an output voltage between 60 and 140 kV. The dose and the dose rate of the X-ray flash together with the diode current are studied as a function of anode-cathode distance, the cathode area and the charging voltage. The tube characteristics are numerically well described by a simple model which considers cathode plasma migration and a space-charge limited current in the remaining vacuum gap.