C波段新型渡越管模拟研究
Simulation research of a new transit-time oscillator
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摘要: 在三腔渡越管的基础上设计了一种工作在C 波段的新型低阻轴向六腔渡越管，其阻抗为15 Ω左右，采用同轴输出。该器件采用大面积发射阴极，无须外加磁场，结构简单紧凑。采用2.5维PIC软件对该器件进行了2维数值模拟，在输入电压为483 kV、电流为32.5 kA的条件下，输出微波平均功率达到3.0 GW，主频为3.75 GHz，微波模式为TEM模。微波功率效率大于19%，比普通低阻抗器件有明显提高。Abstract: A new low-impedance axial transit-time oscillator with six cavities at C-band was designed, based on three-cavity transit time oscillator(TTO). The impedance of this oscillator is about 15 Ω, the microwave is exported in coaxial wave-guide. The oscillator possesses a large area cathode without extra magnetics. The oscillator is simulated in 2D model by 2.5-dimentional PIC code, the peak values of input voltage and current are 483 kV and 32.5 kA respectively; the average peak value of output microwave is over 3.0 GW, the main frequency is 3.75 GHz. The power efficiency of microwave is above 19% and better than that of the normal low-impedance osillators.
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Key words:
- high power microwave /
- transit time oscillator /
- low-impedance /
- numerical simulation
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