共查询到19条相似文献,搜索用时 156 毫秒
1.
2.
给出了广义洛伦兹磁力的定义和证明,论证指出电场既不是动磁场直接产生的更不是变磁场产生的;先有感应电流I,后有电压Uab和电场Eab。解决了愣茨与法拉第之间的原因与结果的哲学争议问题;在当时没有发现电子的情况下,法拉第的漩涡电场及其电动势都是虚构的;完整洛伦兹磁力是电磁感应的物理本质。 相似文献
3.
4.
现代的电子直线加速器是指电子束在微波电场作用下,直线地通过加速结构,能量不断增加的装置.有时又称作电子林耐克(Linac).在电子加速器中它占有十分重要的地位.加速结构通常是一段带圆盘负荷的金属圆波导(见图1,也存在其它加速结构,如后面淡到的边耦合腔结构),利用在其中传播的TM01波纵向电场分量Ez加速电子。加上金属圆盘负荷主要是为了把电磁波传播的相速减到小于或等于光速,以便实现同步加速.本文主要谈谈这类电子直线加速器的现状和发展趋势,并不包括静电加速器、直线电子感应加速器和其它一些低能强流直线加速器.但某些以电子直线加… 相似文献
5.
6.
7.
高能脉冲X射线闪光照相加速器在高性能爆轰流体动力学实验研究中具有重要应用,是牵引高功率脉冲技术发展的重大需求之一。综述了射频直线加速器、电子感应加速器、基于高压脉冲源和高功率二极管的强流脉冲功率加速器3大类、5种闪光照相加速器技术路线的主要特点、代表性装置,对比了几种技术路线的特点,展望了未来发展趋势:一是大力发展共轴多脉冲X射线分幅照相技术;二是采用全固态脉冲功率组件实现加速器紧凑化、小型化和可移动。 相似文献
8.
“神龙一号”直线感应电子加速器 总被引:8,自引:0,他引:8
丁伯南 邓建军 王华岑 程念安 戴光森 章林文 刘承俊 章文卫 张开志 代志勇 赖青贵 李洪 文龙 刘小平 李伟峰 谢宇彤 陈思富 杨国君 李欣 杨安明 王敏洪 杨兴林 潘健 王锦生 薛之春 曹国高 何毅 闫志龙 李远 马冰 高峰 陈楠 石金水 《中国物理 C》2005,29(6):604-610
"神龙一号"加速器是一台20 MeV直线感应电子加速器. 本文介绍了"神龙一号"的物理设计、研制过程和调试结果. 物理设计主要分析了加速器研制的技术难点,并给出各分系统应达到的技术要求和具体结果. 文中重点介绍了脉冲功率系统、注入器、束流的调试情况,调试结果表明,"神龙一号"加速器输出电子束的参数为:电子能量20MeV、束流强度2.5kA、束流脉冲宽度~70ns、能散度0.64%、发射度2060mm·mrad、打靶焦斑尺寸1.2mm . 相似文献
9.
Mini-LIA为MHz重复频率双脉冲电子直线感应加速器,由双脉冲功率系统、热阴极电子枪注入器及金属玻璃磁芯感应加速腔等组成。在此平台的实验获得了数百ns间隔(即MHz重复频率)的双脉冲高压,每个脉冲幅值达到80 kV,脉冲半高全宽为80 ns;在感应腔加速间隙处测得双脉冲加速电场;在加速器出口处测量得到流强约1.1 A的双脉冲电子束流。实验结果表明:利用硅堆隔离汇流装置可实现MHz重复频率的双脉冲高压,金属玻璃磁芯感应加速腔和六硼化镧热阴极电子枪均适合MHz重复频率双脉冲工作方式。 相似文献
10.
本文介绍了新近在中国工程物理研究院建成的一台直线感应加速器。这台加速器由六个250kV的加速组元构成。其中四个用于构成电子源,另外两个用作后加速。输出电子束能量为1.5MeV,束流2—3kA,束脉冲宽度90ns,束的非归—化均方根发射度70mrad-cm。 相似文献
11.
本文认为在感生电场的情况下,磁场的强弱变化可以引起磁场自身的横向运动,使得线圈中电子相对于磁场发生运动,从而等效为一个动生电场,受到洛伦兹力的作用.借助磁感线模拟磁场的运动方式,得到圆形回路中任意一点与磁场相对运动速度的表达式,进而推得该"等效动生电场"中的洛伦兹力.以螺线管为例,验证该方法可以解释感生电场所满足的规律.将感生电场与动生电场的产生原因统一为导体中电子与磁场的相对运动,相应电动势的非静电力统一为洛伦兹力. 相似文献
12.
基于洛伦兹电子论和洛伦兹磁力,否定法拉第定律和相对论电磁学,暨揭示广义洛伦兹磁力的科学研究之五:相对论的协变场是荒唐。本文基于洛伦兹电子论和洛伦兹磁力,论证表明:协变换出来的磁力线成为直线,它违背客观事实;协变换出来的环形电力线更荒唐;协变换出来的电磁场成为无穷大,广义洛伦兹磁力才是真谛;两电荷对撞时协变换出来的排斥力成为虚数,它违背客观事。 相似文献
13.
V. M. Mekhitarian 《Journal of Contemporary Physics (Armenian Academy of Sciences)》2016,51(2):108-126
The Faraday law of electromagnetic induction for an arbitrarily moving charge is generalized and the expression for the force acting on the charge in an alternating magnetic field is obtained. It is shown that besides the Lorentz force perpendicular to the velocity of the particle, the Faraday force parallel to the particle velocity and proportional to it is acting on the charge, too. The equations of motion of the charged particle and the magnetic moment are obtained in the time-varying magnetic field. The problems of induction acceleration of charged particles (betatron) and induction heating of medium (plasma, plasma betatron) are considered. 相似文献
14.
Gal O. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1989,17(4):622-629
The concept of the gyro-resonant accelerator (GYRAC), which is based on cyclotron resonance in a magnetic field that is increasing slowly in time, is presented. Previously published work shows that this results in an autoresonance in which the wave provides a synchronous acceleration of the electrons. Using a simple model makes it possible to design a particularly compact, cyclic electron accelerator; in a cavity with a 1-m radius and final magnetic field of 5 T, electron energy reaches 680 MeV, giving rise to synchrotron radiation of 1 keV. Assuming uniform fields and rescaling time, a Hamiltonian system is arrived at which has one degree of freedom and which, in first-order approximation is time independent. In a second-order approximation, a slow damping of the autoresonant oscillation is found. A paraxial model for beam and fields allows evaluation of the charge effects-the GYRAC then resembles the betatron. These results are illustrated by numerical three-dimensional simulations 相似文献
15.
It is shown that an additional pulsed magnetic field superimposed on the primary magnetic field of a betatron leads to time and spatial variation of the resulting magnetic field in the working gap of the accelerator. A mathematical model is developed for the capture of electrons for betatron acceleration with the additional pulsed magnetic field. It is shown that the time and spatial variation of the magnetic field in the working gap of the accelerator during electron injection leads to an increase in the efficiency of their capture for acceleration. The method of calculation permits a direct modeling of the capture of electrons for acceleration to obtain the highest efficiency.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 40–44, May, 1988. 相似文献
16.
W. Bermel 《Zeitschrift für Physik A Hadrons and Nuclei》1970,237(4):345-367
A previous paper by Drees and Paul reported measurements on a plasma betatron. The study was continued using a betatron field with a vector potential taking into account the self magnetic field of a plasma current. The plasma was produced by a high frequency electric quadrupole field without an azimuthal magnetic field. The bremsstrahlung intensity of the accelerated electrons was observed as a function of gas pressure and accelerating field. The maximum energy of the electrons was 1.3 MeV compared to 1.5 MeV given by the field parameters. The maximum number in this energy range was about 1010 per pulse corresponding to a circulating runaway current of ~ 1 A. The conduction current was drasticly reduced by coating the inner wall of the quartz glass torus with a thin layer of graphite. This change in the plasma current did not influence the γ radiation intensity. 相似文献
17.
An accelerator is proposed in which a TE-mode wave is used to drive charged particles in contrast to the usual linear accelerators in which longitudinal electric fields or TM-mode waves are supposed to be utilized. The principle of the acceleration is based on the Vp × B acceleration of a dynamo force acceleration. That is, a charged particle trapped in a transverse wave feels a constant electric field (Faraday induction field) and subsequently is accelerated when an appropriate magnetic field is externally applied in the direction perpendicular to the wave propagation. A pair of dielectric plates is used to produce a slow TE mode. Discussions will be given on what the conditions of the particle trapping are and how to stabilize the particle orbit. 相似文献
18.
A plasma was produced by a high frequency electric quadrupole field (v=200 Megacycles) at gas pressures of 10?4 to 5·10?3 mm Hg in a quarz glass torus. The torus was placed between the poles of an air-core betatron with the following properties: radius of equilibrium orbit 20 cm, maximum accelerating field strength 80 V/cm, end energy 1.5 MeV. Associated with conduction currents of some 100 A, energetic Bremsstrahlung was observed and attributed to 1,2 MeV electrons. The number of accelerated electrons was of the order of 1011 per pulse. The intensity and energy of the radiation, together with the time dependence of the plasma current, were observed as function of different parameters, such as the gas pressure, high frequency amplitude, induced acceleration field strength, for different gases. The energetic radiation disappears when, because of the self-induced magnetic field, the stability condition for the betatron equilibrium is no longer fulfilled. 相似文献
19.
Intensive currents of runaway electrons with energies of 50 keV or more have been observed at high pressures in a plasma betatron in addition to betatron accelerated electrons at lower pressures. The measurements agree with the assumption that these electrons are accelerated in the external field while they are guided by the self magnetic field of the plasma current. Macroscopic instabilities and plasma waves can be excluded as accelerating mechanisms. The strong dependence of the runaway flux upon the gas pressure and the electric field can be explained by collisions between electrons and the other plasma particles. Furthermore the influence of the external magnetic field on the movement of the plasma current to the torus wall was investigated. A maximum circulating runaway current of more than 2000 A (Xenon) appeared when the plasma current was kept approximately in balance by the external magnetic field. 相似文献