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详细研究了一种用于回旋管冷测的三段式同轴谐振腔模式激励器,该模式激励器利用同轴开放腔的选频选模特性将输入的W波段的波功率转换为TE6,2模式输出。基于缓变截面波导理论,研究了同轴谐振腔激励TE6,2模式的机理;求解了同轴波导中TE模式的特征根和不均匀弦方程并得到腔体谐振频率及Q值;分析了同轴腔内外半径对谐振频率的影响;给出了W波段高纯度TE6,2模谐振腔优化设计的参数;并用电磁仿真软件对其进行仿真计算,结果表明:该谐振腔的TE6,2模式纯度达到99.51%。
A three-section coaxial cavity mode exciter for cold measurement of gyrotron is studied in detail. The mode exciter utilizes the frequency selection mode selection of coaxial open cavity to convert the input W-band wave power to TE6, 2 mode output. Based on the theory of slowly changing section waveguides, the mechanism of coaxial resonant cavity excitation TE6,2 mode was studied. The eigenvalues and non-uniform sinusoidal equations of TE mode in coaxial waveguide were solved and the cavity resonant frequency and Q value were obtained. The influence of the inner and outer radii of the axial cavity on the resonance frequency is given. The optimal design parameters of the high-purity TE6 and 2-mode resonators in the W-band are given. The electromagnetic simulation software is used to simulate the resonant frequency. The results show that the TE6,2 mode purity Reached 99.51%.