The formalism describing the effect of fluctuations in the technical parameters and in the driving signal on the radiation linewidth in gyroklystrons and phase locked gyrotron oscillators is developed. The phase locking by direct injection of the input signal into the resonator and by prebunching of electrons in the input cavity followed by the drift section is considered. In the first case the results of analysis of the free running gyrotron oscillator given in a companion paper [Phys. Plasmas 4, 1413 (1997)] can be used in a straightforward manner. For gyroklystrons and phase-locked gyrotron oscillators with prebunched electron beams, the numerical study is carried out. In particular, the effect of the detuning of the signal frequency from the eigenfrequency of the resonator on the linewidth of radiation in a gyrodevice with a given level of technical noise is analyzed.
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Nusinovich et al. (1997) studied this question.
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