同轴引出电子束相对论返波振荡器的粒子模拟
Particle simulation of relativistic backward wave oscillator with coaxial extractor
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摘要: 设计了一种L波段同轴引出电子束相对论返波振荡器，采用KARAT 2.5维全电磁粒子模拟程序研究了器件内束-波作用的物理过程,分析了二极管电压和导引磁场对产生微波频率和束-波转换效率的影响。模拟结果表明:该器件在小型化，中等磁场的条件下具有较高的束-波作用效率。在电子束能量700 keV，电子束流10 kA，导引磁场为1.0 T时，器件在频率1.62 GHz处获得较高的微波输出，饱和后微波的平均功率达2.2 GW，平均效率约为30%，器件最大径向半径仅为5.0 cm。Abstract: An L-band relativistic backward wave oscillator with coaxial extractor is investigated using the KARAT 2.5 D particle simulation code. Detailed beam-wave physical interaction in the oscillator are presented. Typical simulation results are that, under the magnetic field of 1.0 T, an L-band microwave with an average output power of 2.2 GW is obtained for 700 keV/10 kA electron beam, and the efficiency is over 30%. The optimized electromagnetic structure of the device is Φ100 mm×520 mm.
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