同轴反射三极管振荡器的数值模拟
Numerical simulation on coaxial reflex triode oscillator
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摘要: 提出了一种新型的同轴反射三极管振荡器并对其进行了数值模拟研究。新模型在阴极底座处延伸出一定半径和长度的内导体到互作用区，使得互作用区有了一定的电场梯度，有助于电子在虚阴极和阴极之间来回反射。另外，阴极内导体的引入也使得该器件要求的电子束阻抗可以较高，阴阳极间距可以较大。在电子束电压和电流分别为590 kV和19.1 kA、输出区波导半径为5.6 cm、二极管阴阳极间距为2.5 cm时，通过参数优化，模拟得到输出频率、周期平均功率和效率分别为3.62 GHz，1.7 GW和15%的微波输出。对器件的物理机制进行了初步分析，结果表明反射电子的振荡对微波的产生起主要作用。Abstract: A coaxial reflex triode oscillator for high power microwave generation is proposed and studied by numerical simulation. In the proposed oscillator, a small cylindrical conductor is added on the cathode along the centreline. Thus electric gradient is formed in the interaction region. This is benefical to the reflection of electrons between the real and virtual cathode. For an electron beam of 590 kV and 19.1 kA, by optimizing of structure parameters, the efficiency can reach 15% at an output power of 1.7 GW at 3.62 GHz. Preliminary analysis of the physical mechanism shows that microwave generation comes mainly from the oscillations of the reflex electrons．
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Key words:
- high power microwave /
- reflex triode /
- oscillator /
- numerical simulation
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