利用辛普森算法求解螺线管线圈内磁场分布,证明了离轴磁场能用于电子束的聚束。利用2维粒子模拟程序建立了X波段五腔高增益速调管放大器模型,整管模拟得到了频率9.45 GHz、输出功率300 MW、增益50.3 dB和效率37.5%的微波输出。依此设计了X波段五腔高增益速调管放大器的三维模型,并将其分别放置在线圈中心轴和离轴54 mm的位置进行模拟,模拟结果证明工作在离轴状态的器件同样可以进行微波放大。最后,对一个螺线管线圈内放置七个器件的状态进行了三维模拟,其合成功率输出可达2 GW。

Distribution of magnetic field inside the solenoidal coil is calculated by using Simpson algorithm. It is proved that the off-axis magnetic field can be used for bunching the electron beam. With the aid of 2D particle-in-cell code, an X-band five-cavity high-gain klystron amplifier is designed with an output power of 299.46 MW, a frequency of 9.45 GHz, a gain of 50.3 dB and an efficiency 37.4% respectively. Three-dimensional model of device placed on the coil central axis and off-axis is designed. And the simulation result demonstrates that the off-axis’s device can amplify microwave signal. Seven tubes are placed inside one solenoidal coil simultaneously, the simulated result shows that synthetic power can reach 2 GW theoretically.