Open cylindrical resonator with longitudinal channels in the wall

Conclusions

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 m_o, equal to a multiple of the number of channels, exceeding the Q factors of other oscillations with azimuthal indices m≠m_o, is achieved. The maximum azimuthal index m_o of the fundamental oscillations with radial index p_o=1 is limited by the value of the Q factor (m_o≤Q_o/2). For p_o=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 p_s=2 (Fig. 3, curve 5), is greater than in the case p_o=1 (Fig. 3, curve 4) by a factor of three. It should be noted, however, that in a resonator with fundamental oscillations, having p_o=2, characteristic oscillations with high Q factors, formed by coupled modes with different radial indices (p_s=1, 2), can appear. This characteristic leads to additional restrictions on the choice of resonator parameters.