Abstract
A plasma relativistic microwave amplifier with a gain band of about 1.5 GHz and maximum gain at a frequency of about 3 GHz has been experimentally investigated. Previously the wide gain band of this amplifier made it possible to demonstrate the amplifier frequency tuning in the range from 2.4 to 3.1 GHz. Microwave radiation with a power of 100–150 MW and a pulse duration of 300 ns was obtained using a 2-kA electron beam having an electron energy of 500 keV. The high-current electron beam formed in the explosive emission cathode accelerator has a high noise level in the aforementioned frequency range. This leads to the transition from the mode of input signal amplification to the amplifier self-excitation in a wide frequency band. To suppress the latter process, one must suppress the feedback that is due to the wave reflection from the elements of the amplifier output part. The feedback in the amplifier is suppressed by incorporating a ceramic microwave absorber into its electrodynamic system. The role of the absorber in the suppression of amplifier noise at an input signal frequency of 2.716 GHz is investigated. The parameters of a microwave amplifier without a feedback (with an absorber) are compared with the parameters of a microwave amplifier having a feedback (without an absorber).
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Translated by Yu. Sin’kov
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Strelkov, P.S., Kartashov, I.N. & Dias-Mikhailova, E.D. The Feedback in a Plasma Relativistic Microwave Amplifier of Monochromatic Signal. Phys. Wave Phen. 30, 355–363 (2022). https://doi.org/10.3103/S1541308X22060073
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DOI: https://doi.org/10.3103/S1541308X22060073