Abstract

Results of the numerical investigations of the coaxial-cavity gyrotron with smooth frequency tuning are presented. The tuning is achieved by moving an internal cone-shaped rod along the device axis, which ensures smooth variations in eigenfrequencies of the cavity. The application of an inner conductor with an impedance surface reduces the thermal load on the internal road. The calculation results demonstrate the possibility of tuning the oscillator frequency by 8 GHz for the 394.6 GHz central frequency (within a frequency band of about 2%) with an output power of about several hundreds watts in the CW regime.

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