The estimates made in this paper show that in a resonator with longitudinal channels in the wall and an axisymmetrical absorbing rod, a Q factor of the fundmental oscillations with azimuthal index mo, equal to a multiple of the number of channels, exceeding the Q factors of other oscillations with azimuthal indices m≠mo, is achieved. The maximum azimuthal index mo of the fundamental oscillations with radial index po=1 is limited by the value of the Q factor (mo≤Qo/2). For po=2, the optimum number of channels, ensuring that the Q factor of the fundamental oscillation exceeds the Q factors of the competing oscillations, formed by the coupled modes\(H_{m_s p_s } \) with radial indices ps=2 (Fig. 3, curve 5), is greater than in the case po=1 (Fig. 3, curve 4) by a factor of three. It should be noted, however, that in a resonator with fundamental oscillations, having po=2, characteristic oscillations with high Q factors, formed by coupled modes with different radial indices (ps=1, 2), can appear. This characteristic leads to additional restrictions on the choice of resonator parameters.

The efficiency of a two-resonator CRM oscillator is greater than that of a CRM monotron. The maximum value of the transverse electron efficiency of a two-resonator CRM is 0,87 with hard self-excitation and 0,82 with soft self-exoitation.