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研究了预群聚电子束团沿周期性理想金属光栅表面平行移动时产生的史密斯-帕塞尔辐射(SPR).详细分析了电子束团能量、束团群聚长度、具有不同电流密度分布的电子束团以及光栅结构对辐射特性的影响,同时研究了多个群聚束团的辐射.分析发现,电子束团能量增加、束团群聚尺寸变小以及光栅周期变短,辐射能量角分布峰值所对应的频率明显向高频方向移动;光栅周期与电子束团参量相同的条件下,三角形光栅辐射能量角分布峰值所对应的频率明显高于正弦光栅;群聚束团尺寸越小辐射能量越大,并且束团的纵向群聚长度对辐射能量与辐射频率起主要作用.研究结果表明,通过合理选择光栅尺寸与束团参量,可获得工作频率锁定的太赫兹(THz)波段辐射.
The Smith-Passel radiation (SPR) generated when the pre-clustered electron bunch moves parallel to the surface of the periodic ideal metal grating is studied. The energies of the electron bunches, cluster lengths of bunches, distributions of different current densities E-beam and grating structure on the radiation characteristics were studied.At the same time, the radiation of multiple cluster bunches was studied.It was found that the energy of electron bunches increased, cluster size decreased and grating period shortened, and the angular distribution of radiation energy The frequency corresponding to the peak shifts to the high frequency direction. The frequency corresponding to the peak value of the angle distribution of the radiation energy of the triangular grating is obviously higher than that of the sinusoidal grating under the same grating period and the parameters of the electron beam. The smaller the size of the cluster bunching, The larger the length of the cluster, the longer the cluster length will affect the radiant energy and the radiation frequency.The results show that THz band radiation with locked operating frequency can be obtained by choosing grating size and bunch parameter rationally.