Ku波段磁绝缘线振荡器的数值模拟
Simulation of Ku-band magnetically insulated transmission line oscillator
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摘要: 根据现有的慢波结构色散特性的理论分析，提出了一种Ku波段的磁绝缘线振荡器（MILO）。与常见MILO的慢波结构不同，该MILO的慢波结构通过增大扼流腔的外半径来实现扼流作用，以防止阴阳极击穿。利用3维电磁场模拟软件对Ku波段MILO的开放腔模型进行了分析，得到其谐振频率为13.536 GHz以及有载品质因数为43。同时利用2.5维全电磁粒子模拟软件对其进行数值模拟，进一步优化了MILO结构，研究了输出微波的功率效率与输入电压的关系，得到的最优工作电压为600 kV。在外加电压600 kV、束流47.4 kA的情况下，模拟得到的平均功率为3.69 GW，中心频率为13.62 GHz，功率转换效率为12.6%。Abstract: A Ku-band magnetically insulated transmission line oscillator(MILO) is put forward with the theoretical analysis according to dispersion characteristics of slow wave structure. Compared with common MILOs, the Ku-band MILO designed has a choke cavity whose outer radius is increased to avoid the breakdown between cathode and anode. The resonant frequency of 13.536 GHz and loaded quality factor of 43 are obtained through numerical calculation of the open cavity model of MILO. Then the structure parameters are further optimized and the impact of diode voltage on output power and efficiency is investigated with 2.5 dimensional particle-in-cell simulation. High power microwave is generated from the optimized Ku-band MILO with the average output power of 3.69 GW, central frequency of 13.62 GHz an
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