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Investigation and implementation of methods for sharpening the pulse front and compressing the energy of gigawatt-range pulses by solid-state devices.

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Semiconductor sharpeners providing a subnanosecond rise time of GW-range pulses have been investigated. The sharpeners are made as stacks of series-connected dynistor structures built into an oil-filled coaxial line with 48 Ω wave impedance at the place of an inner conductor. An input voltage pulse has the amplitude of 540 kV with the rise time of ~1.2 ns and voltage rise rate of ~0.3 MV/ns. After pulse propagation through the sharpening sections, its rise time is reduced down to 360 ps, and the voltage rise rate is increased up to ~1 MV/ns. Peak power of the sharpened pulse is within the range of 4.5–5.5 GW. The sharpeners are tested at a pulse repetition frequency of up to 1 kHz in the burst mode of operation.

A method for compressing the pulse energy by a gyromagnetic nonlinear transmission line with saturated ferrites is proposed and implemented. At such an operating regime, the duration of the input pulse is close to the period of generated oscillations, and the main part of the input pulse energy is transmitted only to the first peak of the oscillations. Using a two-stage compressor the input pulse with peak power of 6 GW (490 kV, 40 Ohm) and pulse duration of ~7 ns, was compressed to a record value of peak power for subnanosecond pulses: 30 GW (1.1 MW, 40 Ohm) and 0.65 ns.

Main publications: 26, 31–32.

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