轴向分区双频磁绝缘线振荡器的数值模拟
Simulation of bifrequency-MILO with axial partition
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摘要: 为了便于模式变换器的设计，达到双频微波都能集中辐射的目的，提出一种轴向分区的双频磁绝缘线振荡器，该器件束波互作用区为中间隔开、两端不同周期、不同深度的慢波结构，使电子在上下游与不同频率特性的慢波结构进行束波互作用，得到稳定的双频微波输出。使用2.5维全电磁粒子模拟软件进行数值模拟，在工作电压450 kV，电流40 kA条件下输出微波功率为1.4 GW，功率效率约为7%,输出的微波频率分别为1.25 GHz和1.65 GHz，两者频谱幅度相差约为1.5 dB，模式为TEM模。Abstract: A novel bifrequency-magnetically insulated transmission line oscillator(MILO) with axial partition is put forward. The interaction field between beam and microwave of this kind of MILO is separated into 2 pieces of slow wave structure (SWS) which have different period and cavity depth. Bifrequency microwave is gained because of interaction between beam and microwave in SWS pieces with different frequency character. A 2.5-D full electro-magnetic numerical simulation is conducted by using PIC software at diode voltage of 450 kV and beams current of 40 kA. A microwave pulse TEM mode with power of 1.4 GW and an efficiency of 7% is obtained. Output frequencies are 1.25 GHz and 1.65 GHz respectively with an amplitude difference of 1.5 dB.
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