Generation of multiple pulses with extremely short pulse repetition interval

A new type of multi-pulse generator is proposed for the generation of high power pulses with extremely short pulse repetition interval. In this system, an air-core stepup transformer is used with a magnetic switch. The pulse forming line is charged on a double resonance mode. Numerical simulations of the system have shown that 600 kV, 56 ns duration pulses, matched to a 20 /spl Omega/ impedance can be produced with a minimum pulse separation of 2.7 /spl mu/s. To demonstrate the production of double pulses experimentally, a small system was constructed. The system is constructed of two first stage capacitors (150 nF each), an air-core step-up transformer of turn ratio 1:15, magnetic switch using cobalt based material, a second stage capacitor of 1.6 nF and a load of 80 n. Double pulses of duration 100 ns, peak voltage 85 kV (first pulse) and 90 kV (second pulse) are successfully generated with interval of 3.75 /spl mu/s when initial charging voltage of the first stage capacitors were 14 kV (for first pulse) and 17 kV (for second pulse).