紧凑型P波段相对论返波振荡器的粒子模拟
Particle simulation of compact P-band relativistic backward wave oscillator
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摘要: 设计了一种紧凑型P波段相对论返波振荡器，其电动力学结构是由同轴慢波结构和同轴引出结构组成的。同轴慢波结构缩小了器件的径向尺寸；同轴引出结构缩短了器件的轴向长度，且提高了束波作用效率。通过粒子模拟研究了器件内束波作用的物理过程，模拟结果表明：器件具有结构紧凑、束波作用效率高的特点。在二极管电压700 kV，电流7 kA，导引磁场1.5 T时，器件在频率833 MHz处获得较高的微波输出，饱和后输出微波的平均功率达1.58 GW，效率约为32%，器件电磁结构尺寸仅为108 mm×856 mm。Abstract: A compact P-band relativistic backward wave oscillator is investigated using theoretical and simulation method. The coaxial slow wave structure and the coaxial extractor structure are designed to reduce the size and increase the efficiency of the P-band device. Detailed physical interaction pictures of the oscillator are presented. Typical simulation results are that, at the magnetic field of 1.5 T, a P-band microwave with average output power of 1.58 GW is obtained with efficiency about 32%, when the diode voltage and current are 700 kV and 7 kA, respectively. The optimized electromagnetic structure of the device is only f108 mm×856 mm in size.
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