Pulsed X-ray source based on inductive voltage adder and rod pinch diode for radiography

The pulsed X-ray source based on the inductive voltage adder(IVA) and rod pinch diode(RPD) is developed, and its configuration and main parts and output parameters are introduced in detail. The Marx generator with 3.3 MV charges the water pulsed forming lines with 7.8 Ω and produces the high power pulse of 70 ns width with about 1 MV feeding the three IVA cells in parallel through the peaking water switch and the pre-pulse oil switch. The secondary of IVA adopts the vacuum insulation transmission line(VITL) with the impedance from 40 Ω up to 60 Ω, driving the RPD isolated from the output terminal of IVA for 2 m VITL. The diameter of the graphite cathode of RPD is 12 mm, and the diameter of the tungsten anode rod is 1.2 mm. The electron beam from the cathode is pinched to the tip of the anode rod by the electric-magnetic force of the current and emits the pulsed X-ray with small focus spot. When the Marx generator is charged positive/negative 35 kV, typical parameters of RPD are voltage of about 2.0 MV, current of about 50 kA and full width of half magnitude(FWHM) of 80 ns, and the X-ray parameters are FWHM of about 40 ns, dose of 28 mGy and focus spot diameter of 1 mm. The radiographic images of the spalls of Fe and W material produced by explosion are obtained with the developed X-ray source.