Showing papers by "G. G. Denisov published in 2021"
29 Aug 2021
TL;DR: In this paper, the second harmonic of the gyrofrequency at a frequency of 526 GHz was obtained in the continuous wave generation mode, and the indicated value was several times higher than all known world analogs.
Abstract: In the gyrotron operating at the second harmonic of the gyrofrequency at a frequency of 526 GHz, radiation power of 250 W was obtained in the continuous wave generation mode. The indicated value is several times higher than all known world analogs. Experimental results open new perspectives of gyrotron application for spectroscopy, where both high frequency and high-power are needed.
2 citations
29 Aug 2021
TL;DR: In this article, the authors theoretically study the possibility of high-power (MW-level) generation in second-harmonic gyrotrons based on the frequency-locking by a weak (several percent of the power) external monochromatic signal.
Abstract: We theoretically study the possibility of high-power (MW-level) generation in second-harmonic gyrotrons based on the frequency-locking by a weak (several percent of the power) external monochromatic signal. Such a signal can suppress the generation of the parasitic fundamental harmonic during the start-up process. Within the frame of multimode self-consistent non-stationary model, we demonstrate the applicability of the described approach to provide 0.65 MW output radiation in a 230 GHz 2nd-harmonic gyrotron with TE 31,8 operating mode.
29 Aug 2021
TL;DR: In this paper, the authors present the results of first experiments on generation of trains of sub-nanosecond Ka-band pulses in the electron oscillator consisting of a helical-waveguide gyro-TWT and a saturable absorber based on cyclotron resonance interaction of radiation with initially rectilinear electron beam.
Abstract: We present the results of first experiments on generation of trains of sub-nanosecond Ka-band pulses in the electron oscillator consisting of a helical-waveguide gyro-TWT and a saturable absorber based on cyclotron resonance interaction of radiation with initially rectilinear electron beam. The process of pulse formation is associated with the effect of passive mode locking which is well known in laser physics but has not yet been employed in high-power microwave electronics. In good agreement with the theoretical predictions, periodical trains of coherent (in-phase) 0.5 ns pulses with peak power of 100 kW and repetition period of 2.5 ns were measured.