The constructions and the radiographic characteristics of a kilohertz-range harder pulsed x-ray generator having a hot-cathode diode are described. This generator consisted of the following major components: a thyratron pulser (HRTP-16), a high-voltage pulse transformer, a DC power supply for the filament, and a hot-cathode diode. The ceramic condenser in the thyratron pulser was charged from 8 to 16 kV, and the electric charges in the condenser were discharged to the primary coil of. the transformer. Then the high-voltage pulse of about 100 kV flour the secondary coil was applied to the diode, and harder pulsed x rays were produced. The thyratron pulser was driven by the repetitive electric or light pulses. When the multiple-pulse-type was employed, the x-ray duration was nearly equivalent to the damped oscillation of the tube voltage. In the case where the single-pulse-type was employed, the x-ray pulse width had a value of about 300 ns. The repetition rate was controlled by the frequency of the driving pulse.

View full abstract

The constructions and the electric characteristics of a microsecond repetitive pulsed x-ray generator having a hot-cathode triode are described. This generator consisted of the following major components: a constant positive high-voltage power supply, an energy-storage condensr of 97 nF, a DC power supply for the filament (hot cathode), and a grid-voltage controller. In the present work, the energy-stotage condenser was charged from 50 to 70 kV by the power supply, and the electric charges in the condenser were repetitively discharged to the triode by controling the grid voltage. The duration of pulsed x rays was controlled within a range of 1ms, and the maximum repetition rate had a value of about 30 kHz. The x-ray intensity increased according to increases in the charged voltage, the duration, and the filament temperature.

View full abstract

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.

View full abstract