Overmoded high power millimeter generator with resonant cavity reflector under high order mode
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摘要: 针对过模系数为2.3的高功率毫米波发生器设计了工作于高次模的谐振腔反射器。谐振腔反射器工作模式为TM035模式，在58~62 GHz频带内对TM01模式的反射系数大于0.9。运用2.5维全电磁粒子程序模拟分析了器件中束波相互作用过程，通过调整慢波结构与谐振腔反射器间的漂移段长度得到了器件在570 kV，6.0 kA电子注量驱动下，在引导磁场为4 T时，能辐射出功率1.06 GW、频率为60.2 GHz的毫米波，主要工作模式为TM01模，效率约为31%，起振时间为3.3 ns。Abstract: An overmoded high power millimeter generator with resonant cavity reflector which works under TM035 mode is designed. The reflection coefficient of the resonant cavity reflector to TM01 mode is larger than 0.9 from 58 GHz to 62 GHz. The process of interaction between beam and microwave is analyzed based on particle in cell simulations. By optimizing the length between the resonant cavity reflector and the slow-wave structure for this device, the simulated output power is 1.06 GW at 60.2 GHz frequency with a 570 kV, 6.0 kA electron beam guided by an external magnetic field of 4 T. The corresponding beam-wave conversion efficiency is about 31%, and the starting time is about 3.3 ns.
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Key words:
- high power millimeter /
- high order mode /
- resonant cavity reflector /
- overmoded
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