The third , some groping researches are made on broadband coaxial line filter output circuit of klystron . a broadband output circuit - mode four coupling slots double - gap output cavity loaded with coaxial filter , which has a workable relative bandwidth bigger than 14 % and fits in with l - band multi - beam klystron , is designed . meanwhile some analysis of its stability and peak power capacity is made 第三，对速调管同轴线滤波器宽带输出回路进行研究和探索，设计出了一个适合用于l波段多注速调管、相对带宽超过14的四耦合槽模强耦合双间隙腔加载同轴线滤波器输出回路，并对其稳定性和峰值功率容限做了一些分析。
The second , a complete simulation computation method for output circuit of broadband klystron is developed , basing on existing program isfel3d for simulation computation of three dimensions electromagnetic field , principle of output circuit of broadband klystron and microwave network theory . some practical examples are calculated and the calculated results are compared with cold test results , so that the reliability of the simulation computation method is proven 第二，基于现有的三维电磁场模拟计算软件isfel3d 、宽带速调管输出回路原理和微波网络理论，建立了一套完整的宽带速调管输出回路模拟计算方法，并通过实际例子的计算结果和冷测结果的比较，验证了该模拟计算方法的可靠性。
The feed - back provided by the reflected electron beams reduce the start - up current and the start - up time in a vircator , while the existence of klystron cavity improves the extracting efficiency , hence the radial reflex klystron oscillator with virtual cathode combines the advantages of both devices , becomes a compact , efficient set 利用虚阴极反射电子束对调制腔的正反馈，可以减小起振电流和起振时间，而且提高了微波产生效率。它是一种结构简单，紧凑，不需要引导磁场的器件。
Simulation results show 2 . 5 gw output power with a frequency of 1 . 25ghz can be generated with an input of 620kv voltage , dc input power of 10 . 5gw electron beam . ( 3 ) the radial reflex klystron with an open foldaway - concentric cylindrical resonant cavity integrates the resonant cavity and reflex cavity within one foldaway coaxial cavity , so it is a very compact high power microwave device 然后对这种器件进行了数值模拟研究，得到的典型结果为:输入电压620kv ，输入直流功率io . sgw ，输出微波峰值功率为2 . sgw ，虚阴极振荡频率被锁定，频率为1 . 25ghz ，微波饱和时间小于sns 。
The basic principle , main properties , typical parameters , technical characteristics and general situation of klystron are introduced . the electron beam prebunching in the modulated cavity and shift tube of relativistic klystron amplifer ( rka ) is studied analytically , a self - consistent equation of radiation generated by the prebunched electron beam in the radiation cavity is derived using the field method of particle ? wave interaction instead of the electrical circuit method , and in terms of it , the gain in the linear regime calculated , a field analysis method is proposed . the theory analysis shows that the characteristic parameters , such as resonance frequency , real part of gap - impedance , external quality fadtor in all kinds of klystron output circuits including single - beam , multi - beam , single - gap , multi - gap , single - beammulti - gap , multi - beam multi - gap klystron output circuit , can be calculated by the field analysis method 本文系统的介绍了速调管的工作原理、主要特点、发展概况、主要性能指标和技术特点,解析的研究了电子束在相对论速调管放大器的调制腔和漂移管中的预群聚;用粒子波互作用的场方法导出了在辐射腔中预群聚电子束产生辐射的自洽方程,同时对线性区的增益进行了计算。理论分析表明,场分析法可用于计算单注单间隙、多注多间隙、单注多间隙和多注多间隙速调管输出回路的谐振频率、间隙阻抗实部和外观品质因数等特性参数。
