共查询到20条相似文献,搜索用时 31 毫秒
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N. I. Aizatsky A. N. Dovbnya V. V. Zakutin N. G. Reshetnyak V. P. Romas’ko I. A. Chertishchev V. N. Boriskin N. A. Dovbnya 《Physics of Particles and Nuclei Letters》2014,11(5):647-650
An electron accelerator in which magnetron guns with secondary-emission cathodes of two types are used as a particle source is described. The electron-beam parameters are investigated in an electron energy range of 20–150 keV at a pulse length of 10–50 μs. Results of target irradiation by an electron beam are represented. The target surface structure is studied by the metallographic method, and the microhardness and strength of zirconium materials are measured. The possibility of beam current control by factors of 2.5–3.5 with various methods is shown. 相似文献
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Generation of high-power electron beams by magnetron injection guns with secondary-emission cathodes
V. V. Zakutin A. N. Dovbnya N. G. Reshetnyak Yu. Ya. Volkolupov M. A. Krasnogolovets 《Technical Physics》2001,46(3):348-350
The generation of high-power electron beams by magnetron injection guns using a secondary-emission cold cathode is studied
experimentally. Stable operation at an output power of up to 8 MW is achieved. 相似文献
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Yu. Ya. Volkolupov A. N. Dovbnya V. V. Zakutin M. A. Krasnogolovets N. G. Reshetnyak V. P. Romas’ko 《Technical Physics》2001,46(7):873-876
High-power electrons beams generated in a single injection magnetron gun with secondary-emission cathodes and in a set of such guns are studied. Hollow electron beams of current 50–100 A, electron energy 30–100 kV, and peak power 1–5 MW are obtained. The beams can be used as electron sources in accelerators and ordinary and multibeam high-power microwave devices. 相似文献
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A. N. Dovbnya V. V. Zakutin N. G. Reshetnyak V. P. Romas’ko Yu. Ya. Volkolupov M. A. Krasnogolovets 《Technical Physics》2002,47(12):1580-1583
The generation of powerful electron beams in a single magnetron gun and in a set of magnetron guns with cold secondary-emission cathodes is studied. The possibility of generating tubular electron beams of current 50–100 A, particle energy 30–100 kV, and pulse power 1–5 MW is shown. Such beams can be used as electron sources in the technology of accelerators, as well as in ordinary and multibeam high-power microwave devices. 相似文献
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研究了固定式海关集装箱检测系统用9MeV电子行波直线加速器电子枪的结构特点和束流特性。该电子枪采用钪酸盐阴极,在灯丝电流为2.4A,阳极引出电压为-40kV的工作条件下,由电子枪发射到加速器入口处的脉冲电流强度为300mA,在加速器出口处,束斑截面小于φ2mm;打靶后,产生的X射线剂量率大于30cGy/(min× m)。电子枪的良好特性及束流强度保证了集装箱检测图像所需的高分辨率的要求。为保证满足更换电子枪时的安装要求,利用EGUN程序模拟计算了电子枪的结构及束流特性,为实际装配和使用提供了参考尺寸和调试参数。 相似文献
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Investigations of the operation of a cold-cathode magnetron gun as part of a traveling-wave linear accelerator are described.
Two operating regimes of the gun are observed: with and without the microwave field of the prebuncher near the gun. In the
regime with no microwave field, short (around 2 ns) pulses of accelerated electrons of up to 0.5A were obtained with a gun
current up to 20 A. The presence of a microwave field near the gun makes it possible to obtain a beam of longer duration (up
to 1.0 μs), but with a current of up to 20mA at the accelerator exit and 1A from the gun. The operating mechanism of the gun
is attributed to a secondary-electron current rise and the establishment of self-sustained secondary emission. A comparison
between the conditions of beam production from a thermionic gun and that studied for the same injection energies indicates
that the characteristics of this gun are acceptable for injection into an accelerator.
Zh. Tekh. Fiz. 69, 130–134 (July 1999) 相似文献
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根据8 mm回旋速调管放大器对双阳极磁控注入电子枪的要求,分析了电极形状、阳极电压、磁场、注电流对电子注横纵速度比和速度零散的影响,并进行了粒子模拟。分析表明:这些因素可归根为电场和磁场的作用,阴极附近高的电场有助于提高横纵速度比和降低速度零散;而高的磁场及低的磁压缩比将降低横纵速度比,但对速度零散影响无明显规律。在此基础上通过优化电极形状、磁场分布、电流、第一阳极电压和第二阳极电压,模拟并试制出工作电压65 kV、电流12 A、磁场1.4 T的双阳极电子枪,得到的横纵速度比值为1.4,横向速度零散为4.5%, 为8 mm回旋速调管提供了稳定高质量的电子注。 相似文献
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A technique for controlling the electric field distribution near the cathode of a magnetron injection gun is developed. The feasibility of improving the quality of a helical electron beam by optimizing the electric field distribution in a pulsed 4-mm-wave gyrotron is studied theoretically and experimentally. Field distributions are obtained that minimize the electron velocity spread in the beam, coefficient of electron reflection from a magnetic mirror, and intensity of parasitic low-frequency oscillations. It is demonstrated that the gyrotron efficiency can be increased through a rise in the beam quality at the optimized electric field distribution. 相似文献
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P. P. Kiziridi G. E. Ozur L. A. Zyul’kova S. A. Popov S. A. Shevelev M. A. Alekhin 《Technical Physics》2017,62(11):1643-1650
High-speed video filming is applied to investigate low-pressure (argon 0.053–0.133 Pa) pulsed gas discharge dynamics in a planar magnetron built-in the explosive emission cathode of a high-current electron gun. It has been found that, in the beginning, the discharge starts at the side surface of the cathode and then spreads to its face. The stability of the discharge ignition instant at the cathode face as a function of the working pressure of the gas and the cathode design has been studied. It has been found that the pulsed longitudinal magnetic field results in the discharge switching over in the axial direction onto the electron gun collector. A qualitative explanation of the observed discharge behavior has been given. 相似文献
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Improved Computer Program for Magnetron Injection Gun Design 总被引:1,自引:0,他引:1
Yi Sheng Yeh Ming Hsiung Tsao Han Ying Chen Tsun-Hsu Chang 《International Journal of Infrared and Millimeter Waves》2000,21(9):1397-1415
Gyrotron has received extensive attention owing to its high-power capability, especially when the wavelength shrinks below the millimeter-wave range. The electron beam of a gyrotron is typically generated by a magnetron injection gun (MIG). For high cathode current density, the MIG may operate in a region that combines temperature limited and space-charge limited emissions. An improved computer program for electron gun design is appropriate for MIGs that operate between space-charge limited and temperature limited emission. Moreover, the initial input formation of the program resembles that of the EGUN code. Analysis of a Pierce electron gun and MIGs reveals that the stimulated beam current appears consistent with the measured results. However, EGUN simulation results in which the cathode emitters of MIGs are chosen for the temperature limited emission differ from those of our simulation results. This difference is most likely owing to that the initial emitting energy can not be completely described in the EGUN simulation. Finally, the improved computer program is used to design a MIG for a Ka-band, TE01 mode gyro-TWT. 相似文献
14.
M. Yu. Glyavin A. G. Luchinin V. N. Manuilov 《Radiophysics and Quantum Electronics》2009,52(2):150-156
We determine distinctive features of the systems forming helical electron beams (HEBs) for high-power pulsed gyrotrons operated
in the submillimeter-wave range. It is shown that they are characterized by a nonparaxial magnetic field in the emitter region,
short distances between the cathode and the cavity, and the necessity of supplementing the magnetic system with a cathode
coil placed behind the emitter. In a diode-type magnetron injection gun, which forms a boundary beam with a power of up to
4 MW, one can obtain the HEB parameters which are acceptable for the gyrotron operation.
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 52, No. 2, pp. 164–171, February 2009. 相似文献
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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
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The operating principles, design, and characteristics of an ion source with a cold magnetron cathode and magnetic plasma compression are described. The source is intended for the injector of a linear proton accelerator. 相似文献
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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
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N. I. Aizatskii V. N. Boriskin A. N. Dovbnya V. V. Zakutin V. A. Kushnir V. A. Mitrochenko N. G. Reshetnyak V. P. Romas’ko Yu. Ya. Volkolupov M. A. Krasnogolovets 《Technical Physics》2003,48(2):245-249
A study is made of the generation of electron beams in a system consisting of eight secondary-emission cathodes arranged at regular intervals in the azimuthal direction inside a coaxial cylindrical anode in crossed electric and magnetic fields. In this system with an azimuthally nonuniform electric field, secondary-emission multiplication of electrons is realized and beam generation is achieved. With a cathode voltage of ∼37 kV and a magnetic field of ∼3000 Oe, the total current of all the beams amounts to ∼35 A, the microperveance of each beam being ∼0.7 μA/V3/2. 相似文献