SU571018A1 - X-ray radiation pulse generator - Google Patents

Description

The invention relates to pulsed X-ray generators operating in nanosecond duration, which contain an energy storage device, a glitter, and a non-uniform line with varying wave impedance to which the energy storage device 1 is discharged.

The disadvantage of such devices is current limiting in series with the line impedance of the line. A pulsed X-ray generator is known in which a cut-off bit 2 is turned on to reduce the duration of the generated pulses parallel to the X-ray tube.

The disadvantage of this device is the instability of the pulse duration due to the statistical nature of the lag time of the breakdown in the cut-off arrester.

Closest to the invention, the technical solution is a pulsed x-ray generator containing an x-ray tube, a tip capacitance, a power source, a switching device and a tube shunt tube, Cement 3.

This generator is characterized by a relatively long (10-15 ns) pulse duration due to time

2

discharge cumulative capacity on the resistance of the tube.

The purpose of the invention is to reduce and stabilize the duration of a pulse.

The goal is achieved by the fact that the shunt element is designed as a non-uniform line with a characteristic impedance decreasing along the length of the line from its input,

moreover, the line is loaded on low impedance resistance.

FIG. 1 is a schematic diagram of the proposed generator; FIG. 2 - a variant of constructive execution of a line with

varying wave impedance.

The device contains an X-ray tube 1 connected to a storage tank 2 with a switch 3, a power source 4 for charging the storage tank, line 5

with non-impedance impedance, connected parallel to the tube, and load resistance 6 at the output of the line. The input and output of the line are indicated by the positions 7 and 8. When the switch 3 is triggered, a fault on the storage capacitor 2, pre-charged from the source 4, is applied to the electrodes of the tube 1 and the high-resistance input 7 of line 5 with non-temporal characteristic impedance. The large wave impedance at the line inlet practically does not reduce the voltage across the tube. An impedance impedance 6, connected at the output of the 8th line, sets the time of voltage drop on the tube. The magnitude of the resistance 6 is chosen from the condition that the constant discharge time of the storage capacitor 2 to this resistance is significantly less than the double run of the voltage wave on line 5. The time of action of the voltage on the tube is equal to the double run of the wave along the line, determined by its length and may vary widely.

Line 5 is formed by a generator housing 9 and a wire in the form of a volumetric spiral 10 with a variable diameter of turns. The characteristic impedance of such a line changes due to an increase in capacitance with a decrease in the gap between the body of the apparatus and the turns of the helix.

Claims (3)

1. Months A. A. Generation of powerful nanosecond pulses, M., “Soviet Radio, 1974, p. 219. 2. USSR author's certificate number 387540, cl. H 05G 1/24, 1973. 3.Patent of France No. 2075303, cl. H 05G 1/00, 1971.