在迴旋管谐振迴路中利用缓变椭圆截面过渡段来抑制杂模的探讨

在迴旋管中圆截面谐振腔与圆环电子束相互作用是最合理的。但在这种腔中有与主模谐振频率极接近的杂模存在,本文探讨在相互作用区仍用圆截面谐振腔,而在互作用区外加进一段特殊设计的缓变椭圆过渡段用来抑制杂模的可能性。我们这样设计,其杂模场强能够延伸进过渡段而主模场强则不行;再在过渡段中加载,使其起到抑制杂模而保存主模(cTE0n和sTE1n)的作用。     

THE RESEARCH OF RESONANT CAVITY WITH ELLIPTICAL CROSS-SECTION AT MODERATE ECCENTRICITY IN GYROTRON

In this paper,the method of calculating cut-off frequencies of TE modes in elliptical waveguideis given.From the calculations,it is demonstrated that the gyrotron utilizing a cavity with ellipticalcross-section of moderate eccentricity has the following characteristics:(a)a large volume cavitycan be used;(b)the density of modes which can oscillate is low;(c)it is allowable to use an electronbeam with a large diameter;(d)it is possible to use a cavity mode with low azimuthal number.     

ANALYSIS OF THE DISTRIBUTION OF GAP INTERACTION IMPEDANCE COEFFICIENTS OF RESONANT COUPLED CAVITY OUTPUT SECTION OF BROADBAND KLYSTRONS

From the lumped circuit elements point of view,the distribution of gap interaction impedancecoefficients of resonant coupled cavity output section of broadband klystrons is analyzed.The following topics are discussed:(1)the selection of equivalent circuit;(2)the calculation ofimpedance distribution with given parameters of the lumped circuit element;(3)the calculation oftransfer impedance and microwave circuit parameters with measured self-impedances.     

在迴旋管中采用中等偏心率椭圆横截面谐振腔的探讨

本文综述了几种在迴旋管中采用大横截面谐振腔的办法,计算了中等偏心率椭圆波导各TE模的归一化截止频率。归一化截止频率的数据表明,用椭圆横截面谐振腔的迴旋管具备以下特性:(1)谐振腔体积大;(2)可以振荡的工作模式少;(3)可以使用大直径电子束;(4)可以工作于低次角向腔模。     

对速调管双间隙输出段间隙阻抗矩阵系数分布的分析

本文用集总等效网络的观点对速调管双间隙输出段间隙阻抗系数的分布和变化规律进行了分析。文中讨论了等效电路的选择,从各部件给出的参数来推算系统的阻抗分布并从冷测到的间隙自身阻抗系数来推算转移阻抗系数和各部件的高频参数。     

A S-BAND 2.5 MW HIGH POWER BROADBAND KLYSTRON

In this paper,the design considerations of a high-efficiency high-gain broadband klystron aredescribed.Its buncher has been studied by using small signal gain and large signal efficiencyprograms.With small gain greater than 50dB,the buncher bandwidths of 10% and 10—15% can beobtained for 7 and 8 cavity klystrons respectively.The design methods and measured results ofoutput circuits of two types are introduced.The bandwidths of the filter type and the overlappingmode two gap cavity output circuits are about 7.5—10% and 10—12% respectively.Two types ofS-band broadband klystrons with the two respective output circuits described are constructed andtested,and the one with the former output circuit has 1dB equi-drive bandwidth of 7.5% with anefficiency of 38% and a gain of 43 dB,while the other with the later output circuit has 1dB equi-drive bandwidth of 10%.Their output power is greater than 2.5 MW.     

电磁场中聚焦作用的理论基礎

Ⅰ,圆柱场 1.各种利用电子束及离子束的器件在现代技术及应用电子学中具有极其重大的意义。所以非常需要控制这些带电粒子束及确定他们     

S波段2.5MW宽频带大功率速调管的研制

本文讨论了大功率、高增益、宽频带大功率速调管的设计和制造,还采用小信号增益和大信号效率计算程序,对宽频带速调管的群聚段进行了设计。当小信号增益大于50dB时,7腔速调管的群聚频宽宽于10％,8腔速调管的群聚频宽可达1015％ 给出了两类宽频带输出电路,即滤波器型输出电路和重叠模双间隙腔输出电路的设计方法和测试结果,结果表明:前一种输出电路的频宽可达7.510％,后一种输出电路的频宽可达1015％。 研制了两种类型速调管,采用滤波器型输出段的速调管的性能达到:1dB等激励频宽为7.5％,效率为38％,饱和增益大于43dB,输出功率大于2.5MW。采用双间隙腔输出段的速调管的1dB等激励频宽迟10％,工作稳定。     

具有两节滤波器的速调管宽带输出段的设计方法

本文从等效电路和微波网络理论出发,提出了具有两节滤波器的速调管宽带输出段的设计方法,根据该方法,在给定的阻抗实部R*下,可求得频宽最宽的一组设计参数。实验证明该方法是可行的。     

EFFICIENCY CALCULATIONS OF RESONANT COUPLED CAVITY OUTPUT SECTION OF BROADBAND KLYSTRONS

The efficiency of the output section of broadband klystron with resonant coupled cavity is cal-culated.In the solution of that problem,neither the time integrated electron disk model nor thespace charge wave theory is used.The disk model requires too long computer time,and the spacecharge wave theory is rather simplistic.A new modified method is proposed,with which the computertime is saved much more and the calculated result is in fair coincidence with the measured one.