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Generation of multiple pulses with extremely short pulse repetition interval

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3 Author(s)
Takao, Kazuto ; Fac. of Eng., Toyama Univ., Japan ; Masugata, K. ; Yatsui, K.

A new type of multipulse generator is proposed for the generation of high power pulses with an extremely short interpulse repetition interval. In this system, an air-core step-up transformer is used with a magnetic switch and a pulse forming line, which is charged in the double-resonance mode. Numerical simulations of this system have shown that 600 kV, 56 ns pulses, matched to a 20 Ω impedance can be produced with a minimum pulse separation of 2.7 μs. A small system was constructed to demonstrate the production of double pulses experimentally. The system contains two first stage capacitors of 150 nF each, a 1:15 air-core step-up transformer, a magnetic switch using cobalt based material, a second stage capacitor of 1.6 nF, and an 80 Ω load. Double-pulses 100 ns wide, peak voltages of 85 kV (first pulse) and 90 kV (second pulse) have been successfully generated with an interval of 3.75 μs between pulses, when the first stage capacitors were charged to 14 kV (for the first pulse) and 17 kV (for the second pulse)

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Plasma Science, IEEE Transactions on  (Volume:28 ,  Issue: 5 )