C波段相对论速调管放大器3维整管模拟研究
Three-dimensional whole-tube simulation of C-band relativistic klystron amplifier
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摘要: 建立了带输入、输出波导结构的C波段相对论速调管放大器3维整管模型，利用3维软件对其高频特性进行了数值计算研究，对整管结构进行了优化设计。并用3维PIC程序对电子束经过输入腔后的束流调制、注入微波的吸收情况、中间腔对束流的调制以及输出腔后微波提取情况进行了模拟研究。模拟结果表明：输入腔与微波注入波导匹配较好，注入微波能被电子束和谐振腔很好吸收，在输入腔间隙后20 cm处得到了11%的基波电流调制深度；在中间腔后15 cm处得到了约76%的基波电流调制深度；在中间腔后电流调制最强处加上输出腔，提取到800 MW的输出微波，效率26%。Abstract: The three-dimensional whole-tube model for a C-band relativistic klystron amplifier is designed. With the integrated model, the high frequency characteristic analysis and optimization of the tube are presented. A three-dimensional full-electromagnetic particle-in-cell(PIC) code is used to simulate the absorption of injected microwave, and to simulate the fundamental harmonic modulated current when electron beams propagate through the input and idler cavity gaps. The simulated result show that the input cavity matches with the input waveguide and most energy of the input microwave is absorbed by electron beams and the resonant cavities. The modulation depths of the fundamental harmonic modulated current are about 11% at 20 cm downstream of the input cavity gap and about 76% at 15 cm downstr
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