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利用线性理论对Ka波段工作模式为TE01模的回旋行波管进行了稳定性分析,计算了介质加载条件下工作和寄生模式的传播损耗,以及不同传播损耗下工作模式的起振电流;对不同介质加载条件和工作电流,给出了3个主要寄生模式的起振长度;确定了介质加载厚度以及相对介电常数等参数。计算结果表明,在优化得到的介质加载条件下,寄生模式在其各自振荡频点的单位长度传播损耗大于抑制各寄生模式返波振荡所需最低损耗值要求;工作模式起振电流大于设计所需工作电流;寄生模式的起振长度大于设计的介质加载段和未加载段长度;设计的介质加载参数能够满足抑制工作和寄生模式自激振荡的要求。利用优化设计的高频结构及介质加载参数,进行了整管热测实验,得到了输出功率160kW,饱和增益40dB,效率22.8%以及3dB带宽5%的回旋行波管。
The linear theory is used to analyze the stability of the traveling-wave system in the Ka-band TE01 mode. The propagation losses of the working and parasitic modes under medium loading and the starting currents of the working mode under different propagation losses are calculated. Medium loading conditions and operating current, the starting lengths of the three main parasitic modes are given; parameters such as the dielectric loading thickness and the relative permittivity are determined. The calculated results show that the propagation loss per unit length of parasitic modes at the respective oscillation frequency is greater than the minimum loss required to suppress the back-wave oscillation of each parasitic mode under the medium loading condition. The starting current of the mode is greater than the design requirement Working current. The starting length of the parasitic mode is longer than that of the designed loaded and unloaded sections. The designed media loading parameters can satisfy the requirement of suppressing self-oscillation of working and parasitic modes. By using the optimized design of high frequency structure and dielectric loading parameters, the whole pipeline thermal test was carried out and the gyro TWT was obtained with output power of 160kW, saturation gain of 40dB, efficiency of 22.8% and 3dB bandwidth of 5%.