中文摘要：

应用粒子模拟软件对设计的二次谐波三腔回旋速调管放大器进行了数值模拟。分析讨论了二次谐波注-波互作用过程中电子群聚的物理图景和特点，并研究了电子注电流和归一化引导中心半径对电子注-波互作用效率的影响。模拟结果表明，本文设计的二次谐波三腔回旋速调管放大器在35GHz频率可获得约293kW的峰值输出功率和约28％的电子效率。

英文摘要：

The second harmonic three-stage gyroklystron amplifier is designed and simulated by means of PIC simulation software. The physical pictures and characteristics are discussed in the beam-wave interaction of the second harmonic three-stage gyroklystron amplifier. The effects of electron beam current and normalized guiding center radius on the beam-wave interaction efficiency are studied. The simulated results show that the designed second harmonic three-stage gyroklystron amplifier can produce an output peak power of 293 kW and 28 % electron efficiency at 35 GHz.