具有双电子束结构的双波段相对论返波振荡器粒子模拟研究
Investigation of dual-band relativistic backward wave oscillator with dual annular electron beams by particle-in-cell simulation
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摘要: 研究了一种能够同时产生C波段和X波段微波、具有双电子束结构的相对论返波振荡器,采用嵌套式的高频结构将两个波段的束-波相互作用空间隔离开来，从而使两个波段的束-波相互过程互不影响。当二极管电压为650 kV、内外环形电子束流分别为5.4,6.4 kA、导引磁场为2.2 T时，两个波段微波的频率分别为4.625,8.450 GHz，模拟产生的微波功率分别为920,600 MW，转换效率约为21.8%,17.1%。并采用粒子模拟法研究了导引磁场、二极管电压及两个束-波相互作用区关键结构参数对器件运行的影响，给出了双波段微波功率、频率随导引磁场、二极管电压等参数的变化曲线。Abstract: A dual-band relativistic backward-wave oscillator(RBWO) with dual annular electron beams generating C-band and X-band microwaves is investigated by particle-in-cell (PIC) simulation. Two separated beam-wave interaction regions are supplied to obtain independent generation processes of the dual-band microwaves. With the diode voltage of 650 kV, the inner beam current of 5.4 kA and the outer beam current of 6.4 kA guided by a magnetic field of about 2.2 T, the dual-band microwaves are generated with dominant frequencies of 4.625 GHz and 8.450 GHz. The powers of the dual-band microwaves are 920 MW and 600 MW with efficiencies of 21.8% and 17.1%, respectively. The influence of the guiding magnetic field, diode voltage and key structure parameters on the powers and frequencies of the dual-band
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