介质加载回旋行波管互作用结构
Dielectric-loaded interaction structure for gyrotron-travelling wave tube
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摘要: 分布式介质加载技术已被成功应用于回旋行波管的高频结构，该结构对于回旋行波管的自激振荡起到很好的抑制作用。对采用分布式介质加载的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，给出了三个主要寄生模式的起振长度；在对介质加载回旋行波管工作和寄生模式稳定性综合分析的基础上，确定了介质加载厚度及相对介电常数等参数。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160 kW，饱和增益40 dB，效率22.8%及3 dB带宽5%的回旋行波管。Abstract: The distributed dielectric loading technology has been successively applied in many gyrotron-travelling wave tube(gyro-TWT) experiments to suppress absolute instabilities. Based on the stability analysis of a Ka-band TE01-mode gyro-TWT with distributed-loss interaction circuit, propagation loss of operation and parasitic modes, start current of operation mode under different propagation losses are calculated. Start lengths of the three main parasitic modes under different loss-loading conditions and operation currents are given. Dielectric loss parameters including thickness of loss layer and relative permittivity are then decided. Taking advantage of the optimized parameters of loaded dielectric, a high gain scheme has been demonstrated in a 34 GHz, TE01-mode gyro-TWT, producing 160 kW sa
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