共查询到19条相似文献,搜索用时 625 毫秒
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微波管中收集极要受到电子轰击而发热,如果散热不及时,会出现收集极内表面熔蚀。收集极的散热问题、绝缘问题以及降压问题要同时考虑。
降压收集极组件如果装配不紧密,收集极散热的效果就变差,导致大量放气,整管寿命缩短;挤压过紧则容易使陶瓷材料断裂,导致收集极的绝缘、耐压性能变差。
我们试验30多次,运用国际上先进的磁脉冲挤压法技术,并成功组合各类降压收集极40只。采用这种新工艺完全能够解决降压收集极组合的问题。 相似文献
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导热绝缘胶的研制和应用方法 总被引:4,自引:0,他引:4
讨论了导热系数k与材料本身相联系的因素,以树脂、固化剂和导热绝缘填料的选择组合处理上进行了试验,取得了性能优异的导热绝缘的配方,结合具体的器件与散热构件的组合进行了讨论,取得了良好的散热效果,解决了一些问题。 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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在一只1千瓦连续波750兆赫速调管上测试了一个十级静电降压收集极,它是借助于模拟计算机进行设计的。在不同的高频激励情况下,计算和测量的性能达到良好地一致。利用降压收集极,在高频满功率输出情况下,经能量交换的电子注的能量中的60%可得以回收。管子的纯功率转换效率以未降压时的54.3%上升到约为70.9%。在二分之一满功率输出情况下测得收集极效率为70%。在零高频功率输出情况下,收集极效率是80%。为了达到上述结果,需要在最后漂移管和收集极之间装置一个小型的聚焦线包。当采用收集极降压时,没有发现寄生振荡或不稳定性,电子返转也未大量增加。相邻一对收集极的内部短路,仅使收集极性能略微降低。 相似文献
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Kumar L. Spidtke P. Carter R.G. Perring D. 《Electron Devices, IEEE Transactions on》1995,42(9):1663-1673
A three-dimensional (3-D) package for simulation of asymmetric and crossed-field multistage depressed collectors for microwave tubes has been developed. This package is based upon the 3-D finite-difference code KOBRA3-INP. The main features of the package are a user-friendly input interface, post-processors for collector analysis and calculation of secondary electron trajectories, and versatile output graphics. Both PC and mainframe versions of the package have been developed. The results of simple benchmark tests and those of simulation and analysis of asymmetric and crossed-field collectors including the effects of secondary electrons are presented. It is found that the asymmetric hyperbolic electric field collector shows very low backstreaming. It is shown that the representation of trajectories in energy space gives a better insight into the behavior of individual trajectories than plotting in coordinate space. The package will be useful for designing novel types of depressed collector 相似文献
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A new form of depressed collector for microwave tubes has been investigated. It is shown that the use of a suitably selected transverse magnetic field in the collector leads to a smoothing of the power dissipation curve on the collector walls and to a fifty-fold reduction in the returning secondary-electron current. 相似文献
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Ane -gun, depressed collector, and guide-field solenoid have been designed and tested for operation at a maximum of 400 kV and 38 A in order to simulate key components of a typical low-voltage free electron laser (FEL). Detailed beam-energy-spread analyses and computer simulations are presented for thee -gun and the drift regions. The results of experiments with the depressed collector show beam-current-recovery efficiencies of over 90 percent fore -beam voltages from 160 to 400 keV. We have also set up and confirmed computer-code predictions that a space-charge depression in the collector (which is essential for efficient collection) forms at a collector-voltage setting of 1 percent of the beam voltage. These results demonstrate the validity of substantially increasing the efficiency of systems by using depressed collectors to recover the bulk of the energy which is left in thee -beam after it leaves the laser resonator. The recovery-efficiency parameter (recovered current/cathode-emission current) is shown to be a function of the relativistic-orbit parameter (B/betagamma ) and reaches a maximum of 94 percent. These results imply that FEL system efficiencies can be achieved which are an order of magnitude higher per stage than would be possible without the use of depressed collection. 相似文献
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Experiments have been carried out on the 2N929 transistor to investigate the effect of collector voltage and collector current on junction temperature. The results indicate that at constant power dissipation increasing the collector voltage will increase the junction temperature and give the apparent effect of a higher thermal resistance. 相似文献
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《Electron Devices, IEEE Transactions on》1958,5(4):300-305
This paper describes the design of single-stage and double-stage collectors which can be operated at "depressed" potentials. When these single-stage and double-stage collectors were used in conjunction with a traveling-wave amplifier, over-all efficiences of 46 and 57 per cent were obtained, respectively. The maximum increase in efficiency which can be obtained by the use of depressed collectors having one to three electrodes is calculated for various traveling-wave tube design parameters. 相似文献
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电力电子设备常用散热方式的散热能力分析 总被引:1,自引:0,他引:1
本文对电力电子设备中常用的风冷和水冷两种散热方式的散热能力作了综合分析。分析结果表明,以散热器底面热源的均匀热流大小作为散热能力的标准,在保证电子设备正常工作的条件下,有散热空间限制时,风冷系统散热极限约为40W/cm2,如果不受散热空间的限制,散热能力会更高。水冷系统的散热能力比风冷系统高出1到2个数量级,其散热潜力还未得到充分挖掘,目前水在微通道内强制对流的冷却方式是水冷系统中具有最大散热能力的方式,其散热能力可达790W/cm2。这两种冷却方式散热能力的分析结果可作为热设计人员选择经济合理的散热方式的依据。. 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