At the same time the influence of the cavity in front of slow - wave structure and the length of a smooth drift tube which connect two sections of slow - wave structure are also studied in this dissertation 然后利用magic粒子模拟软件模拟了反射器对器件工作性能的影响,同时还分析了慢波系统前面的腔体以及两段式慢波结构中过渡段的长度对器件工作性能的影响。