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在相对论速调管放大器的研究,非工作模的激发是影响器件正常工作的一个重要因素,尤其是高增益情况,这些非工作模在实际结构中还包含非对称模式.同时在相对论速调管放大器的结构中,其输入和输出部分不可避免地要引入3D结构,因此依据2D理论或2DPIC模拟得到的结果不能满足实际结构的实验需要.论文依据2DPIC设计的高增益S波段相对论速调管放大器模型进行3D研究,研究了输入、输出部分中3D结构对束波互作用的影响,通过3DPIC模拟排除了2DPIC模拟中不能反映的非对称模式的影响,验证了3D冷腔分析结果,实现了2DPIC的模拟结果:电子束参数为流强5kA、电子能量600kV,注入微波功率0.88kW、模拟微波输出功率0.57GW,相应增益为6.48×10~5.
In the research of relativistic klystron amplifiers, the non-working mode excitation is an important factor affecting the normal operation of the device, especially in the case of high gain. These non-working modes also contain asymmetric modes in the actual structure. Meanwhile, Amplifier structure, the input and output part of the inevitable to be introduced into the 3D structure, so based on 2D theory or 2DPIC simulation results can not meet the experimental needs of the actual structure.Paper based on 2DPIC designed high-gain S-band relativistic klystron amplifier The 3D model is used to study the influence of 3D structure on the interaction of the beam and the wave in the input and output parts. The 3DPIC simulation excludes the influence of asymmetric modes that can not be reflected in the 2DPIC simulation. The 3D cold cavity analysis results are verified and the 2DPIC Simulation results: the electron beam parameters of flow 5kA, electron energy 600kV, injection microwave power 0.88kW, analog microwave output power 0.57GW, the corresponding gain of 6.48 × 10 ~