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开放光栅中史密斯-帕塞尔超辐射机理研究

Keywords: 色散方程,史密斯-帕塞尔效应,超辐射,粒子模拟

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Abstract:

采用理论分析和粒子模拟相结合的方法,对连续电子注通过平板矩形光栅产生毫米波段史密斯-帕塞尔(SP)超辐射机理进行了研究.研究结果表明:选择恰当的电子注与光栅尺寸参数,光栅表面慢波将与电子注互作用,使电子注产生群聚,群聚的电子束团将在光栅表面产生史密斯-帕塞尔超辐射,其辐射频率为电子注与光栅表面慢波互作用同步点频率的整数倍,其辐射角度方向与史密斯-帕塞尔公式所预期的基本一致,表面慢波由于光栅的有限长度也能在其端头以一定的形式辐射出去.

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