基于Marx发生器原理设计了150 kV脉冲X射线测试系统,该系统采用正负极充电的双边Marx发生器线路,Marx发生器设计为15级同轴结构,采用紧凑低电感设计来获得窄脉冲的输出.实验结果表明,X光机设计合理,获得了窄脉宽、高幅度的高压脉冲输出:在充电电压为20 kV的情况下,X射线管电压150 kV;X射线脉宽约60 ns;25 cm处剂量约7.8×10-6 C/kg;焦斑直径2.5 mm.搭配计算机X射线摄影系统,成像面积可达30 cm×40 cm,分辨力大于1 lp/mm,可以满足一般低能闪光照相的需要.

A 150 kV pulsed X-ray test system is designed according to the principle of bipolar charged Marx generator.It is mainly used for ballistics studies,impact studies and fluid dynamics simulation of weapons in flash photography.A 15-stage Marx generator is designed in coaxial structure and used in the pulse generator to shorten the pulse width of output pulses.Marx generator connects with the flash X-ray tube through a high-voltage cable.For a charging voltage of 20 kV per stage,the Marx generator generates a more than 150 kV pulse voltage that is applied to the X-ray tube.The X-ray tube generates a dose 7.8×10-6 C/kg at 0.25 m away for flash X-radiography with a pulse width of 60 ns.The size of X-ray source is 2.5 mm.150 kV pulsed X-ray test system used with computed radiographic system be able to an imaging area of up to 30 cm×40 cm,resolution is greater than 1 lp/mm for X-ray image .It is the ideal tool for high-speed radiation photography.