共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
基于绝热压缩原理和强流电子光学理论,设计了一只170 GHz回旋管双阳极磁控注入电子枪,经过理论分析及计算,采用仿真软件进行模拟和优化,最终得到的电子枪的电子注速度比为1.31,横向速度零散度为3.5%,纵向速度零散度为6.1%,束电流为51 A。讨论了阴极磁场、控制阳极电压和第二阳极电压等因素对电子注性能的影响,发现电子注的速度比和速度零散度对这些影响因子的变化都非常敏感:随着阴极磁场的增大,电子注的速度比减小,纵向速度零散度先增大后减小,横向速度零散度先减小后增大;阳极角越接近阴极倾角,纵向速度零散度越小;阳极角向着减小阴阳极间距的方向变化时横向速度零散度变小;增大第一阳极电压可以增大电子注的速度比和电子注的速度零散度。在两阳极电压不变的情况下,增大阴阳极之间的距离会使电子注的速度零散度和电子注的速度比减小。 相似文献
3.
基于绝热压缩原理和强流电子光学理论,设计了一只170 GHz回旋管双阳极磁控注入电子枪,经过理论分析及计算,采用仿真软件进行模拟和优化,最终得到的电子枪的电子注速度比为1.31,横向速度零散度为3.5%,纵向速度零散度为6.1%,束电流为51 A。讨论了阴极磁场、控制阳极电压和第二阳极电压等因素对电子注性能的影响,发现电子注的速度比和速度零散度对这些影响因子的变化都非常敏感:随着阴极磁场的增大,电子注的速度比减小,纵向速度零散度先增大后减小,横向速度零散度先减小后增大;阳极角越接近阴极倾角,纵向速度零散度越小;阳极角向着减小阴阳极间距的方向变化时横向速度零散度变小;增大第一阳极电压可以增大电子注的速度比和电子注的速度零散度。在两阳极电压不变的情况下,增大阴阳极之间的距离会使电子注的速度零散度和电子注的速度比减小。 相似文献
4.
5.
6.
Yu. Ya. Volkolupov A. N. Dovbnya V. V. Zakutin M. A. Krasnogolovets N. G. Reshetnyak V. P. Romas’ko 《Technical Physics》2001,46(9):1196-1198
The formation of an electron layer and the generation of an electron beam in magnetron guns where secondary emission is triggered by nanosecond pulses are studied. In the guns with small cross sizes, hollow electron beams with an outer diameter of 3–6 mm are generated. The beam current is 1–2 A, and the cathode voltage is 5–7 kV. Results obtained indicate that the generation of nanosecond beam-current pulses is a possibility. 相似文献
7.
Yu. Ya. Volkolupov A. N. Dovbnya V. V. Zakutin M. A. Krasnogolovets N. G. Reshetnyak V. P. Romas’ko 《Technical Physics》2002,47(10):1326-1329
The initial stage of forming the electron sheath and electron beam generation in magnetron guns for the case when the secondary emission process is triggered by nanosecond pulses is considered. In the guns with small transverse sizes, tubular electron beams with an outer diameter of 4–6 mm and a current of 1–2 A are produced at a cathode voltage of 5–10 kV. It is shown that the formation of the electron cloud and beam current pulse front for a time of ≥2 ns is a possibility. 相似文献
8.
9.
10.
O. Dumbrajs 《International Journal of Infrared and Millimeter Waves》1994,15(7):1255-1262
Dependence of the coupling of the electron beam and RF field in a gyrotron cavity on eccentricity of the electron beam is studied. 相似文献
11.
Anderson J.P. Korbly S.E. Temkin R.J. Shapiro M.A. Felch K.L. Cauffman S. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》2002,30(6):2117-2123
We present the design and initial operation of a 96-kV 40-A magnetron injection gun for a 1.5-MW 110-GHz gyrotron. A critical parameter for the successful application of this electron gun is the uniformity of electron emission. The current-voltage curve of emission, at a series of temperatures, is measured. Analysis indicates that the work function of the emitter is 1.6 eV with a (total) spread of 0.07 /spl plusmn/ 0.01 eV. Measurement of the azimuthal emission uniformity with a rotating probe indicates that the work function variation around the azimuth, the global spread, is 0.04 /spl plusmn/ 0.02 eV. The spread due to local (microscopic scale) work function variations is then calculated to be 0.06 /spl plusmn/ 0.02 eV. Temperature variation can be ruled out as the cause of the observed emission nonuniformity. 相似文献
12.
N. I. Ayzatsky A. N. Dovbnya V. V. Zakutin N. G. Reshetnyak V. N. Boriskin N. A. Dovbnya V. P. Romas’ko I. A. Chertishchev 《Physics of Particles and Nuclei Letters》2008,5(7):634-637
The reliability and service life of accelerating installations are substantially determined by the lifetime of electron sources.
The accelerator under consideration has a magnetron gun with a channel-free cold secondary-emission cathode in crossed fields
as an electron source [1, 2]. In the present work, the data of the electron beam parameters obtained in the accelerator based
on the magnetron gun with a secondary-emission cathode are given, and possible secondary uses are suggested.
The text was submitted by the authors in English. 相似文献
13.
V. B. Vladyko 《Technical Physics》2001,46(5):640-642
An axially symmetric model is used to analytically estimate the longitudinal electric field created in a plasma by an injected electron beam. The relationship can be used to estimate the electron beam energy loss in the range of parameters where theoretical studies rely only on numerical simulations. The results are of interest for creating relativistic electron beams, studying their relaxation in plasma, and developing new methods for charged particle acceleration. 相似文献
14.
N. A. Zavolsky V. E. Zapevalov M. A. Moiseev 《Radiophysics and Quantum Electronics》2006,49(2):108-119
We study theoretically the influence of the spread of initial energies and velocities in the electron beam on the starting
conditions and efficiency of a gyrotron. We compare various analytical and numerical models and the results of experimental
studies of gyrotrons in which the interaction takes place at the first and second harmonics of the cyclotron frequency. The
aftercavity interaction of the electron beam with the high-frequency field in the output waveguide transition is taken into
account. The influence of the energy spread on the recuperation efficiency is estimated. Permissible spreads of the initial
energies and electron velocities are determined.
__________
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 49, No. 2, pp. 121–133, February 2006. 相似文献
15.
16.
会切磁场中大回旋电子束产生的研究 总被引:1,自引:0,他引:1
研究了会切磁场产生的机理。通过对Moster-Molnar 模型的探讨, 建立了会切磁场的物理模型。在会切磁场理论分析和数值模拟基础上, 探讨了影响会切磁场设计的因数; 利用拉格朗日公式求解了会切磁场中电子运动轨迹。探讨了会切磁场与大回旋空心会切电子枪的关系, 得到了改进会切电子枪性能的一些一般性结论。 相似文献
17.
N. P. Venediktov M. Yu. Glyavin A. L. Goldenberg V. E. Zapevalov A. N. Kuftin M. A. Moiseev A. S. Postnikova 《Technical Physics》2000,45(12):1571-1574
The electron distribution over residual energy after electron interaction with an rf field was determined using the method of decelerating electric field. It is demonstrated that, under the maximum efficiency conditions, electrons with an energy lower than 30% of their initial energy are absent in the spectrum. Hence, the efficiency of energy-recuperation gyrotrons can substantially be increased. 相似文献
18.
19.
20.
While an intense electron beam passes through the accelerating gaps of a linear induction accelerator, a strong wake field will be excited. In this paper a relatively simple model is established based on the interaction between the transverse magnetic wake field and the electron beam, and the numerical calculation in succession generates a magnetic wake field distribution along the accelerator and along the beam pulse as well. The axial electric wake field is derived based on the relation between field components of a resonant mode. According to some principles in existence, the influence of this field on the high voltage properties of the induction gap is analyzed. The Dragon-I accelerator is taken as an example, and its maximum electric wake field is about 17 kV/cm, which means the effect of the wake field is noticeable. 相似文献