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Results from numerical simulations have demonstrated the principle of a co-harmonic gyrotron, operating with a novel cavity. Such a cavity is capable of generating coherent radiation at both the 2nd and 4th harmonics of the electron cyclotron frequency simultaneously, at frequencies of 37.5 GHz and 75 GHz. Further results are presented here, including refinements to the output section of the cavity,...
A third-harmonic large-orbit THz gyrotron with a sectioned cavity, which combines a long electron-wave interaction region and a relatively low diffraction Q-factor, is described. A similar scheme can be used to realize a self-exciting two-wave gyrotron with frequency multiplication.
A novel interaction cavity has been designed for a gyro-oscillator, allowing co-harmonic generation at the 2nd and 4th harmonic resonances of the cyclotron frequency. The output aperture of the cavity has been designed to trap the lower harmonic, whilst allowing output of the upper harmonic. Results from recent numerical simulations, performed using MAGIC 3-D, are presented. The intended co-harmonic...
The maximal frequency of radiation higher than 1 THz has been recently obtained in pulse gyrotrons both at IAP (Nizhny Novgorod, Russia) and FIR (Fukui, Japan). CW generation at a 2.2-kW power level is radiated from a 300-GHz gyrotron and used for technological applications. New gyrotrons demonstrate single-mode operation at the second cyclotron harmonic with a frequency of 395 GHz in the CW regime...
Progress on the study of a 3rd-harmonic large orbit gyrotron with the radiation frequency of 1 THz and a prototype of a promising gyro-multiplier at the 4th harmonic are presented.
Methods for realization of two-wave gyro-oscillators with frequency multiplication provided in a single operating cavity are proposed. A possibility for realization of a moderately-relativistic (250 keV) THz gyro-multiplier operating at 5-6 cyclotron harmonic with the output power of about 1 kW, as well as of an analogous weakly-relativistic (80 keV) CW device with the output power of 1 W, is demonstrated.
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