双波段相对论返波振荡器模拟研究
Particle simulation of dual-band relativistic backward-wave oscillator
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摘要: 提出了一种采用单电子束实现C波段和X波段微波同时输出的新型相对论返波振荡器，该器件的束波作用区为中间用渐变段隔开的两段盘荷结构。使用Karat软件进行了2.5维全电磁粒子数值模拟，在工作电压为1 MV，电流为8 kA，导引磁场为3 T的条件下，输出微波功率大于1 GW，功率效率约为15%，输出的微波频率分别为5.42 GHz和9.58 GHz，二者频谱幅度相差2.17 dB，模式为TEM模。Abstract: A novel relativistic backward-wave oscillator(RBWO) is introduced with two kinds of slow wave structure separated by a tapered waveguide. It could obtain an output of C-band and X-band microwave simultaneously by means of a single electron beam. A 2.5-D full electro-magnetic numerical simulation is conducted by using Karat code at diode voltage of 1 MV, beam current of 8 kA, and guiding magnetic field of 3 T. A microwave pulse of TEM mode with power of 1.08 GW and an efficiency of 15% is obtained. Output frequencies are 5.42 GHz and 9.58 GHz respectively with an amplitude difference of 2.17 dB.
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