8 mm二次谐波回旋速调管谐振腔设计研究
Cavity for 8 mm second-harmonic gyroklystron amplifier
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摘要: 结合回旋速调管研究的相关理论，考虑到高次谐波工作时带来的模式竞争，以及注-波互作用的耦合关系，讨论了在半径、腔长、杂模抑制以及腔内媒质涂层的介电参量等诸多因数影响的情况下，如何设计二次谐波回旋速调管谐振腔的问题。结合设计方法建模，优化设计出了5个适于8 mm二次谐波工作的谐振腔，通过漂移段连接成两种高频结构，其中一种结构在注-波互作用非线性模拟中取得了251 kW的输出功率，电子效率 23.9%，增益 27.2 dB，3 dB带宽大于0.4%；另一种结构初步取得了246 kW的输出功率，其它参数正在测试之中。Abstract: This paper presents how to design cavities for 8 mm second-harmonic gyroklystron amplifier based on the theory of gyroklystron amplifier. A lot of factors, such as the radius, length of cavity, modes competing, beam-wave coupling coefficient and the character of coated medium which can restrain the unwanted modes are discussed. Two high frequency structures composed of five designed cavities are tested, one has obtained an output power of about 251 kW with an efficiency of 23.9%, a gain of 27.2 dB and the 3 dB bandwidth is over 0.4%. The other has obtained an output power of about 246 kW and the other parameters are to be tested.
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