中文摘要：

为了克服强流高增益速调管放大器中的自激振荡和适应低阻抗脉冲功率源发展的需要,利用高阻抗X波段五腔高增益速调管放大器进行了离轴八注八管高增益速调管功率合成技术研究,在频率为9.47 GHz、模拟输出功率为284 MW、增益为51.6 d B和效率为35.5%条件下,该器件整管微波输出稳定.在三维模型中,在离轴54 mm条件下该器件的微波输出特性稳定.基于实验室现有4.5 T（长1.1 m,室温孔径为150 mm）超导磁体,进行了八注八管高增益速调管的整管模拟,每个器件实现284 MW的微波输出.最后,为实现GW级功率输出,利用HFSS软件设计了用于离轴八注八管高增益速调管功率合成的八合一功率合成器,将该合成器同八注八管高增益速调管结合,模拟得到功率为1.84 GW、增益为50.7 d B、效率为28.8%的微波输出.

英文摘要：

In this paper, in order to overcome the self-excited oscillation in the high-gain relativistic klystron amplifier, an X-band high-gain relativistic klystron amplifier（RKA） is designed driven by the relativistic beam with its current at a k A-level. The corresponding diode impedance is 800 ？. Its output power reaches 284 MW at the frequency of 9.47 GHz,and the gain and efficiency are 50.6 d B and of 37.4% respectively when the beam voltage is of 800 k V. And for the obtained GW-level RF power in low-impedance pulsed power sources, the power microwave combination technology of off-axis eight-tube high-gain RKA is used. In the three-dimensional model, the microwave output of this kind of RKA is almost constant when the device is at off-axis 54 mm. Simulation is based on the 4.5 T superconducting magnet which is4.5 m long in the laboratory, and the eight-tube high-gain RKA is simulated using a magnet with the microwave output of 284 MW. Then an eight to one power combiner is designed using HFSS software, and the combiner with eight-tube high-gain RKAs is simulated by a three-dimensional model. Its output power is 1.84 GW, with a gain of 50.7 d B and efficiency of 28.8% respectively.