新型史密斯-帕塞尔互作用结构中的辐射特性
Radiation characteristics in a novel Smith-Purcell interaction structure
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摘要: 新型史密斯-帕塞尔互作用结构是一个同轴型系统，它包括倒置的曲面镜和柱状光栅，并且光栅的截面可以是任意形状。用粒子模拟软件MAGIC对新结构进行模拟分析和优化，由于新结构采用倒置曲面镜，改变了光栅位置，大大增加了环状电子注半径，在同样电子注密度和厚度情况下，可以获得比改进前结构高几倍的电流，且辐射功率可提高1个数量级。并给出了新结构及改进前两种互作用结构在3 mm甚至更短波段的粒子模拟分析和计算结果，其输出功率达到数百MW以上。Abstract: A novel Smith-Purcell interaction structure is presented. It is a coaxial structure including the outer curved mirrors and the middle cylindrical gratings of arbitrary shaped section. Inverting the curved mirrors and changing the position of gratings turn the structure into the improved one, in which greater current can be obtained with bigger-radius ring beam. And the radiation power increases by one order of magnitude. Theoretical analyses and numerical simulation results indicate that coherent radiation with peak power of a few hundred of MW can be achieved from the improved experimental model．
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