Wiggler聚焦带状注速调管电子光学系统的设计
Design of sheet beam klystron electron optics system with Wiggler focusing style
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摘要: 带状注速调管可以在高频段实现高功率微波输出，电子光学系统是带状注速调管的关键部件。阐述了Wiggler双平面聚焦理论，设计了新型椭圆形柱面阴极和椭圆形聚焦极结构，阴极曲率半径为17 mm，长轴10 mm，短轴4 mm；聚焦极长轴28.8 mm，短轴10.4 mm。采用这种结构可以直接产生椭圆形带状电子注，且阴极发射电流密度较为均匀。设计了周期长度为8 mm，总长度为108 mm，中间带有凹槽并可以实现双平面聚焦的Wiggler结构，模拟显示电子注填充因子在75%左右，通过率达到100%。设计了新型的菱形收集极结构，电子轨迹在收集极内发散均匀。Abstract: Planar beams can generate high-power radiation in device like sheet-beam klystrons at high-frequency range. Electron optics system is the key part of the sheet beam klystron. Two-plane Wiggler focusing principle is illustrated in this paper. Elliptical sheet beams with uniform current density are generated by the new-style electron gun geometry which comprises of an elliptically cylindrical cathode and an elliptical focusing electrode. The fill factor of 75% and the beam transmission of 100% are obtained through the center notched Wiggler focusing system with total length and period length of 108 mm and 8 mm respectively. The trajectories are uniformly distributed in the new diamond-shaped collector.
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