共查询到17条相似文献,搜索用时 171 毫秒
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在低压缩比、低导流系数情况下,对Vaughan迭代综合法因阴极半锥角初始值取得不合理而失效的原因进行了分析,并对其中的迭代公式进行了合理修正。采用Vaughan迭代综合法和修正后的迭代综合法验算了13支不同性能的电子枪,结果表明:采用修正迭代法,阴极半锥角初始值即使在0°~70°取值,都能得出正确的计算结果。在原来Vaughan法适应的情况下,修正法与原方法的阴极半锥角结果之间差值小于1°;在原来Vaughan法失效的情况下(如低导流系数、低压缩比小于7),改进后的方法也能得到接近实测值的合理结果。 相似文献
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分析了过渡区中电子注调节的基本原理,设计了一种渐变式的过渡区结构,其注腰半径为0.8 mm,周期均匀磁场峰值为0.29 T,周期为4.5 mm,压缩比为22。该结构能够在减小电子枪压缩比的情况下对电子注进行再压缩,得到符合互作用要求的电子注。将采用渐变式过渡区结构的电子注匹配与采用传统方法的电子注匹配进行了比较,模拟结果表明:采用渐变式过渡区结构匹配电子注不仅能有效改善电子注的层流性(波动性为8%),还能够提高电子光学系统的稳定性。根据此方法对Ku波段6 kW行波管的电子光学系统进行了模拟计算,得到了良好的设计结果。 相似文献
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扩展互作用器件,采用三个线圈和一个磁极实现均匀磁场分布。根据理论计算采用有限元法磁学(FEMM)仿真软件对所求磁场进行了建模分析,依据FEMM计算的磁场结合静电电子枪,采用CST仿真软件对高电流密度、高压缩比的电子注在均匀聚焦磁场的作用下传输进行优化。经过计算得出,在工作电压为17 kV、阴极发射电流密度小于10 A/cm2的条件下,由皮尔斯电子枪发射的电子注在均匀磁场的聚焦作用下传输良好,通过率为100%,得到了导流系数为0.175μP的电子枪,在均匀磁场区形成了高电流密度、高压缩比的电子注,平均电流密度达到343.17 A/cm2,压缩比为32,电子注横纵速度比为7.2%。 相似文献
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Current and space-charge density distribution calculation is of great significance for numerical analysis and design of high-current electron guns and beams. When the electrons’ thermal initial velocities are taken into account, though there have been some numerical methods published, the calculation is very complicated. By introducing equivalent meridional potential and projection trajectory theory, the curvilinear axis trajectory equation for electrons neighboring to a central curved trajectory in rotationally symmetric electro-magnetic fields is derived in first- and second-order approximations. The evolution equation of the current density distribution of toroidal electron sub-beams is derived and it can be used to calculate the current and charge density distribution in electron beams and guns in iteration calculation. A compact numerical algorithm for calculating round high-current electron guns and beams was developed and related program was written as well. As examples, the evolution of the current density distribution of a Pierce gun and a periodic magnetic focusing high-current electron beam is simulated. This proves that this method is effective and practical. 相似文献
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基于一台两相四极空心补偿脉冲发电机,研究了多相脉冲电机放电波形调节的最优化问题。对补偿脉冲发电机的三种典型负载:电磁轨道炮、脉冲激光器和电热化学炮的基本特性进行了阐述,针对这三种负载分别提出了相应的优化指标,分析了量化脉冲波形对负载的适用程度,并将波形优化问题转化为函数优化问题。在建立了脉冲电机放电数学模型的基础上,使用差分进化算法对优化问题进行求解,找到最优点火角组合。对电磁轨道炮,优化指标为弹丸加速度比。将加速度比的概念进行拓展,可得到适用于脉冲激光器的尖顶脉冲。对电热化学炮,提出了“形状方差”的概念,消除了电流幅值的影响,能够较好地衡量脉冲形状的适用性。仿真结果表明,提出的脉冲波形优化指标是有效的,在智能优化算法的帮助下,能够通过控制量的组合得到不同类型负载的最优波形。 相似文献
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Ananjin P.S. Karpov V.B. Krasik Ya.E. Lisitzin I.V. Petrov A.V. Tolmacheva V.G. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1992,20(5):537-542
Experimental results concerning the application of coaxial plasma guns with fast pulsed gas vents to provide the plasma for the microsecond plasma opening switch (MPOS) are reported. Various gases were used for the plasma production. Using the lightest gases (H2 , D2) yielded the best MPOS performance and resulted in the highest voltage and impedance levels as the switch opened. The importance of the role of secondary plasma production is demonstrated. Analyses of MPOS parameters as a function of different types of plasma are shown 相似文献
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E. A. Soluyanova 《Radiophysics and Quantum Electronics》1995,38(6):395-400
A procedure of taking account of magnetic field inhomogeneity in the synthesis of axisymmetric magnetron-injector guns which produce the Dryden flow is described. The systems of self-consistent equations in the T and modes of cathode emission are given. The results of solving numerically the inside and outside synthesis problems are compared with the earlier results for a homogeneous magnetic field.SALYUT Research and Production Enterprise, Nizhny Novgorod. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol 38, No. 6, pp. 596–603, June, 1995. 相似文献
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Issues of numerical simulation of an experiment on compression and heating of a target in a magnetic field are discussed. It is found that the applied magnetic field predominantly increases the plasma lifetime and plasma jet characteristics (velocity, Mach number, density, etc.). An analysis of the effects of the application of an external magnetic field on the behavior of plasma-driven guns (plasma jets) and laser-driven systems (laser beams) is carried out. Thermodynamic questions in simulation of experiments on magnetic inertial synthesis are touched upon. 相似文献
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V. E. Zapevalov A. N. Kuftin V. K. Lygin Sh. E. Tsimring 《Radiophysics and Quantum Electronics》1992,35(11-12):640-645
The results of numerical simulation and experimental study of magnetron injection guns for high-power gyrotrons that form intense helical electron beams are compared. Three types of beams are studied: those with regularly intersecting trajectories, laminar, and mixed (with irregularly intersecting trajectories). The corresponding guns differ in the angle of inclination of the emitting surface to the axis of axial symmetry. Numerical simulation was performed using the ÉPOS program, which takes into account the effect of the space-charge field on the velocity distribution. The experimental studies of the latter were performed by the retarding-field method. It is established that with allowance for temperature deformations of the electrode systems, the experimental data are in satisfactory agreement with the theoretical. It is shown that for a maximal beam current, the best velocity-distribution characteristics (velocity spread and pitch factor) are provided by guns that form laminar and boundary beams (an intermediate case between laminar and regularly intersecting beams). 相似文献