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

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2.2T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920,600MW,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.%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 microwaves is discussed.