抄録
The constructions and the radiographic characteristics of a vacuum ultraviolet generator in order to primarily produce water-window flash x rays are described. This generator consisted of the following major components: a negative high-voltage power supply, a polarity-inversion-type high-voltage pulser with a combined ceramic condenser of approximately 15 nF, a thyristor pulser as a trigger device of the pulser, an oil-diffusion pump, and a water-window flash x-ray tube. The x-ray tube employed a surface-discharge ferrite substrate in order to effectively decrease the electron accelerating voltage. The ceramic condenser in the pulser was negatively charged from 10 to 30 kV by the power supply, and the electric charges in the condenser were discharged to the tube after closing a gap switch. The maximum output voltage from the pulser was -1 times the charged voltage. The duration of the water-window flash x rays was nearly equivalent to those of the damped oscillations of both the tube (discharge) voltage and current. The maximum values of the tube voltage and current had values of 18 kV and 1.7 kA respectively.
