Development of a compact generator for nanosecond high-voltage pulses

A compact generator producing a 2.2 ns high-voltage pulse was developed. The pulse was formed by a 27.7 , 0.9 ns pulse forming line (PFL), which was charged by an iron core transformer with a turn ratio of 2∶33.5 and a coefficient of 0.94. Meanwhile, an adjustable self-break oil switch was applied. The principle of triple resonance transformation was employed by adding a 50 pF tuning capacitor and a 1.15 mH inductor between the transformer and the PFL, which leaded to a significant reduction of the duration and peak value of the transformer voltage without reducing that in the PFL. By using transmission lines with impedance overmatched to that of the PFL, the generator delivered a peak voltage of up to 500 kV across an electron beam diode, generating radiation with a dose of 20 milliroentgens per pulse at a distance of 20 cm, which provides an excellent ultra-short radiation pulse source for studies on radiation physics.