共查询到17条相似文献,搜索用时 154 毫秒
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多级降压收集极被广泛地应用于空间行波管的设计中,本文介绍了一种四级降压收集极的设计和模拟方法。通过对某一空间行波管互作用后的废电子注信息进行分析,得到电子注在收集极的入口条件,并且根据电子注入口条件确定各电极的电位,用行波管模拟软件模拟废电子注在收集极内的发射情况,计算出收集极的效率,通过分析电子注粒子运行轨迹和能量分布,优化收集极边界条件和各电极电位设置,提高收集极效率,降低电子回流率。结果表明:利用此方法计算得到的收集极效率达到80%以上,该模拟分析方法对行波管收集极的研究设计具有参考价值。 相似文献
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行波管多级降压收集极的计算和实验研究 总被引:3,自引:1,他引:3
采用多级降压收集极是提高行波管效率析有效途径之一。本文在SLAC-266程序的基础上对一支带有二级降压收集极的国外行波管进行了计算,并且将计算结果同实验结果进行了比较。同时用电子注分析仪对降压收集极区电子注和纵向速度分布进行了实验研究,获得了该二级降压收集极的部分工作曲线,并对实验结果进行了分析讨论。 相似文献
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在美国空军(USAF)——国家航宇局(NASA)共同制定的规划中,Lewis研究中心正在进行电子对抗行波管效率的改进工作,它是通过采用多级降压收集极(MDC)以及在该中心所探索的对耗能电子注的再聚焦技术来实现的。在本规划的分析阶段,计算了整个行波管的三维电子注轨迹。轨迹计算一直到耗能电子注的再聚焦区和降压收集极。对收集极效率、收集极损耗和管子总效率进行了验证和计算。在实验工作方面,首先对不用多级降压收集极的管子性能进行估测,然后对耗能电子注的对称性、圆度和速度离散作了分析。最后,装上了多级降压收集极,使其性能最佳并进行了估测。对于理想的行波管,三维理论表明:具有对称、圆型并有最佳再聚焦电子注的2级多极降压收集极在中心频带有81%的效率(多级降压收集极),而4级多级降压收集极有85%的效率。实验结果所获得的数据表明:一个倍频程带宽——(4.8~9.6)千兆赫、功率为330~550瓦行波管的2级和4级降压收集极的最小多级降压收集极效率分别为81%和83%。 相似文献
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效率是行波管(TWT)的重要技术指标,为提高某一0.22 THz折叠波导行波管的效率,需设计多级降压收集极。对注波互作用后的电子注信息进行分析,估算收集极效率最高时的电压设置。利用电磁仿真软件对三级降压收集极电极结构和电压设置进行仿真优化,得到效率大于87.5%,回流电流小于0.328 9 mA的轴对称三级降压收集极;在第二电极入口采用斜口结构进行仿真优化,得到回流电流小于0.075 mA的非轴对称三级降压收集极。结果表明,采用斜口结构可以有效降低0.22 THz行波管多级降压收集极的回流电流。 相似文献
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为了确定回旋行波管收集极入口的初始条件,利用CST2009模拟回旋行波管静态电子的运动轨迹,以3D模型,更直观、形象的显示出电子在回旋行波管中的运动轨迹。模拟计算表明,在电子注电压为70kV,电子注电流为10.4A,工作磁场为l.5T时,回旋行波管的电子注发射出的电子最终降落在收集极的530~700mm处。模拟结果为回旋行波管的设计和收集极的热分析提供了有效的依据。 相似文献
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为了提高真空管雷达发射机的效率、缩小整机的体积和重量,常使用多级降压收集极行波管作为功率射频放大器.为了保证多级降压收集极行波管高增益、高效率和良好线性等性能发挥的更好,就要在行波管每个电极上加合适的电压,确保行波管内建立稳定的电场.因此,根据行波管各电极的特性合理地选择各收集极的电压以及合理的设计高压电源显得尤其重要.文中结合多级降压收集极行波管的工作特性介绍了4种高压电源的设计方法及其特点. 相似文献
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《Electron Devices, IEEE Transactions on》1981,28(12):1480-1489
A comparison of analytical and experimental results is presented for a high performance dual-mode helix TWT, equipped with multistage depressed collectors (MDC), and operated over conditions ranging from saturation to the linear regime. The computations are carried out with advanced multidimensional computer programs which model the electron beam as a series of disks or rings of charge and follow their trajectories from the RF input of the TWT, through the slow-wave structure, through the refocusing system, to their points of impact in the depressed collector. Twr performance, collector efficiency, and collector current distribution are computed and compared with measurements. Very good agreement is obtained between computed and measured TWT performance and collector efficiencies. The analytical techniques were subsequently applied to the design of a smaller MDC of nearly equal efficiency. 相似文献
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《Electron Device Letters, IEEE》1981,2(10):252-254
The improved efficiency of a multistage depressed collector (MDC) with ion-beam textured pyrolytic graphite electrode surfaces is demonstrated by comparison with the performance of other MDC's tested with the same microwave rf amplifier traveling-wave tube (TWT). Because of the sensitivity of overall TWT efficiency to collector efficiency, significant improvements in TWT performance are possible with the use of textured pyrolytic graphite MDC's. 相似文献
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《Electron Devices, IEEE Transactions on》1969,16(9):827-828
A new and unexpected concept of TWT circuit modification which results in high basic beam and depressed collector efficiencies is described. The test results which are presented disclose that 50 percent depressed collector efficiency has been achieved over a 10 per cent bandwidth, and that maxima of 42 and 52 percent, respectively, of beam and depressed collector efficiency have been measured at spot frequencies. The tube which produced these results contained a single continuous helix tapered at the output end so that the phase velocity of the fundamental circuit wave was increased. 相似文献
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Ka波段连续波500W螺旋线行波管研究 总被引:1,自引:1,他引:0
Ka波段螺旋线大功率行波管在大容量的通信系统中具有重要作用,本文介绍了目前大功率连续波螺旋线行波管的现状,对相关技术进行了分析。通过对高频结构的互作用分析、热分析、多级降压收集极等分析,设计了一个Ka波段连续波500 W行波管的螺旋线互作用结构,计算机模拟结果表明可以满足设计要求。 相似文献
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Shunkang Liu 《Journal of Infrared, Millimeter and Terahertz Waves》2002,23(6):899-906
The efficiency enhancement methods for helix and coupled cavity traveling wave tube (TWT) in millimeter wave (MMW) are described. The interaction efficiency has been reached 14.56% by dynamic velocity taper in Ka-band TWT. Efficiency improvement has been carried out by used copper helix for broadband MMW TWT. Owing to a ferruleless coupled cavity TWT used phase-adjusted taper, the interaction efficiency has been increased from 9.6 to 22.6%. Finally, enhancing collector efficiency used multistage depressed collectors is discussed in the paper. These concept and technology of the approach are very useful for tube designer. 相似文献