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超高速炸药加速器炮口弹丸速度的测量 总被引:1,自引:0,他引:1
炸药驱动器超高速(>3000m/s)弹丸速度的测量是超高速发生器及超高速碰撞现象研究等领域内一个必不可少的环节,本文在传统电测法及X光闪先照相技术的基础上,提出了改进的测量技术,使测量中尽量避免各种因素对测试的干扰,成功地获得了弹丸的炮口速度。实验表明,该技术为超高速驱动器及超高速撞击现象研究提供了一种可靠而方便的测试手段。 相似文献
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Numerical simulation of intense helical electron beams with the calculation of the velocity distribution functions 总被引:3,自引:0,他引:3
V. K. Lygin 《International Journal of Infrared and Millimeter Waves》1995,16(2):363-376
The method of calculation of intense helical electron beams which allows to find the distribution function of electrons with respect to their transverse (oscillatory) and longitudinal velocities is developed. The initial velocity distribution function can be arbitrary. The data obtained in numerical simulation and experimental measurements for beams with various topologies are compared. The evolution of the transverse velocity distribution function with the beam current growth is traced. It is found that the transformation of the velocity distribution function may indicate a possible instability in a real beam. 相似文献
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V. N. Manuilov V. Yu. Zaslavsky T. Idehara 《International Journal of Infrared and Millimeter Waves》2006,27(12):1573-1593
The development of oscillations of the space charge and potential in the adiabatic trap of a gyrotron between the cathode
and the cavity is studied numerically. The PIC method is applied, with the real two-dimensional distributions of the electric
and magnetic fields taken into account. Secondary emission is included into the numerical model, as well as such factors as
the electron beam space charge, thermal velocities of electrons, and emitter roughness. The value of the trapped space charge
as a function of time is calculated. Time dependences of the potential in various cross-sections of the formation system are
traced. The amplitudes of its variable component have been found and then the corresponding frequency spectra have been calculated.
The process of cathode bombardment is investigated. The energy distribution and time dependence of the current in the electron
beam coming to the operating space are found. Some ways to reduce the oscillations of the potential and the space charge are
discussed. 相似文献
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Genaro J. Martínez Andrew Adamatzky Juan C. Seck‐Tuoh‐Mora Ramon Alonso‐Sanz 《Complexity》2010,15(6):34-49
Using Rule 126 elementary cellular automaton (ECA), we demonstrate that a chaotic discrete system — when enriched with memory — hence exhibits complex dynamics where such space exploits on an ample universe of periodic patterns induced from original information of the ahistorical system. First, we analyze classic ECA Rule 126 to identify basic characteristics with mean field theory, basins, and de Bruijn diagrams. To derive this complex dynamics, we use a kind of memory on Rule 126; from here interactions between gliders are studied for detecting stationary patterns, glider guns, and simulating specific simple computable functions produced by glider collisions. © 2010 Wiley Periodicals, Inc. Complexity, 2010 相似文献
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利用逆向式再生环形喷射装置,研究了高速喷射条件下液体的点火燃烧性能。实验研究发现:喷射条件下液体药的点火燃烧性能较整装式液体装药容易实现一致性,且燃速大幅度增加。同时研究了伴随再生喷射燃烧过程所出现的高频压力振荡,分析了高频压力振荡产生的原因。提出了液体药喷射条件下点火延迟度的概念,它可作为评价RLPG点火器工作性能的指标之一。利用喷射点火延迟度的概念,比较了液体药喷射点火延迟性能对于喷口面积、活塞质量、液体药粘度及液体药能量等参量变化的敏感性。 相似文献
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A. N. Kuftin V. K. Lygin V. N. Manuilov A. S. Postnikova V. E. Zapevalov 《International Journal of Infrared and Millimeter Waves》1999,20(3):361-382
The paper presents a modern approach to studies of characteristics of intense helical electron beams (HEBs) for gyrotrons. The essence of the method consists in finding functions of electron distribution with respect to oscillatory velocities in the beam both by numerical simulation and experimentally. Experimental and calculated data for beams with different topologies were compared in different frequency ranges. Evolution of the electron oscillatory velocities distribution function as the beam current grows has been traced. Influence of the reflected electrons on beam parameters has been simulated numerically. 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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C. J. Edgcombe 《International Journal of Infrared and Millimeter Waves》1995,16(9):1491-1511
The condition for geometrical similarity of trajectories given by Dryden has been modified to be relativistically correct, thus allowing the complete Dryden-Harker procedure to be used to design electrodes for relativistic electron streams of limited velocity spread. The magnetic field in the cathode region has been modelled by an analytic expression, to allow converging field to be simulated while similarity of the magnetic force is retained. Examples are given of the use of the revised method for design of high-voltage and external electron guns for gyrotrons. 相似文献
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