Solid-state repetitive generator with a gyromagnetic nonlinear transmission line operating as a peak power amplifier

Abstract

In this work, experiments were made in which gyromagnetic nonlinear transmission line (NLTL) operates as a peak power amplifier of the input pulse. 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. Power amplification is achieved due to the voltage amplitude of the first peak across the NLTL output exceeding the voltage amplitude of the input pulse. In the experiments, the input pulse with an amplitude of 500 kV and a half-height pulse duration of 7 ns is applied to the NLTL with a natural oscillation frequency of ∼300 MHz. At the output of the NLTL in 40 Ω coaxial transmission line, the pulse amplitude is increased to 740 kV and the pulse duration is reduced to ∼2 ns, which correspond to power amplification of the input pulse from ∼6 to ∼13 GW. As a source of input pulses, a solid-state semiconductor opening switch generator was used, which allowed carrying out experiments at pulse repetition frequency up to 1 kHz in the burst mode of operation.

Radio Frequency Oscillations in Gyrotropic Nonlinear Transmission Lines

“…Thus, gyromagnetic NLTLs can be seen as a new technology to produce short RF pulses of very high intensities, while being quite simple in design. Accordingly, they may prove useful for many applications with only modest demands as to spectral line purity or total radiated energy, like EMC test beds [16,17] or subsurface radar. The obvious advantage of such systems is their ability to operate without employing intense particle beams and high vacuum.…”

Video Pulse Conversion Into a Radio Frequency Pulsed Waveform of Complex Composition

“…Of certain interest is the task of launching the so called peak power amplifier (PPA) regimen [7], where the NLTL is operated in such a way as to form solitary output video pulses of very short duration with, accordingly, a spectrum of maximum possible width. To that end, it is necessary that the pulse duration τ Р equaled about 2 or 3 temporal periods of the oscillations expected to be excited.…”

A Review of Nonlinear Transmission Line System Design

“…Other researchers operated a gyromagnetic NLTL as a peak power amplifier of an input pulse, with similar pulse duration, and most of the input energy transmitted to the first oscillation peak. Experiments applied a 500 kV, 7 ns half height pulse duration pulse with about 300 MHz frequency input to the NLTL, yielding a 740 kV, 2 ns duration output, and 6 to 13 GW amplification [125]. Using the NLTL in a high current environment permitted its use in a gigawatt class electron beam driver.…”