切伦柯夫相互作用中分段式慢波结构与均匀慢波结构的比较研究

 分析了切伦柯夫束波相互作用中使用单段慢波结构的缺点。指出在分段式慢波结构中，漂移段及其两端的慢波结构组成一Bragg谐振腔，当漂移段长度合适时，根据渡越时间效应理论，这种结构能减小调制束中电子的速度分散，提高束波转化效率。通过粒子模拟方法，比较了均匀慢波结构与分段式慢波结构中束波相互作用的物理图像，验证了理论分析结果，并说明了后者有束密度群聚充分，束电子速度分散小，产生微波功率高、频谱质量好，最佳工作电流大，输入电功率高等优点。

Comparative investigation between the uniform slow-wave structure and the sectional slow-wave structure in Cerenkov interaction

The disadvantages of the uniform slow-wave structure in Cerenkov beam-wave interaction are analyzed. It is put forward that in the sectional slow-wave structure, the drift tube and the two section SWSs of its ends comprise a Bragg resonant cavity, which can reduce the energy dispersal of the modulated beam electrons due to the transit time effect when the length of the drift tube is well chosen, thus to enhance the beam-wave energy conversion efficiency. By means of the PIC simulation, physical graphs of beam-wave interaction in the uniform slow-wave structure case and in the sectional slow-wave structure case are compared, and the simulation results confirm that the latter has several advantages, such as more effective beam-wave energy conversion efficiency, better spectrum quality, and higher input electrical power.