170 GHz兆瓦级回旋振荡管设计研究

该文基于广义传输线理论和电子回旋脉塞理论，考察模式谱、深入研究注-波耦合系数和不同模式的起振电流，选择TE_32，12模式为170 GHz兆瓦级回旋振荡管的工作模式。通过合理调整电子注工作参数有效抑制高次模谐振腔中的暂态模式，优化谐振腔的光滑缓变段来抑制寄生振荡模式。当电子注的横、纵速度比为1.3，引导中心半径为9.4 mm，电压为80 kV，电流为45 A，互作用磁场约为6.715 T时，该只优化设计的回旋振荡管在170.18 GHz频点输出功率超过1.8 MW，效率约为50%。此外，建立切合实际的电子注速度零散模型，讨论了速度零散对该只管子的性能影响。

Design and Study of 170 GHz Gyrotron with MW Power

Based on the theories of generalized transmission line and electron cyclotron resonance maser, the TE_{32, 12} mode is selected as the operating mode of a 170 GHz megawatt gyrotron by investigating the mode spectrum and studying the beam-wave coupling coefficient and the start-current of the modes carefully. Through appropriately arranging the parameters of the beam, the transient modes in the high order mode resonator are suppressed effectively. And through designing the gradual sections of a kind of taped cavity, the parasitic modes are suppressed furthest. As a result, an output power of 1.8 MW, corresponding to 50% efficiency, and an oscillation frequency of 170.18 GHz have been achieved with a pitch factor 1.3, radius of guiding center 9.4mm, 80 kV, 45A helical electron beam at a guiding magnetic field of 6.715T. At the same time, we have also set up a velocity-spread model suitable to actual circumstances and discussed the performance impact to the gyrotron.