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 mm_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_oQ_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 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.Institute of Applied Physics, Academy of Sciences of the USSR. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 25, No. 4 pp. 453–460, April, 1982.