共查询到19条相似文献,搜索用时 436 毫秒
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介绍了对一台脉冲线加速器驱动虚火花放电装置产的电子束发射度的测量工作。在十隙虚火花放电室中育以15Pa的氮气,产生能量为约200keV,束流2000A,直径为1mm和高亮度电子束。在距阳极5cm处测得电子束的均方根发射度εrms≈48mm.mrad,规一化发射率εn≈47mm.mrad。 相似文献
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设计了一种新型的高功率低气压等离子体电子枪。基于空心阴极效应和低压辉光放电原理与经验,确定了空心阴极、加速间隙、工作气压范围等。提出关于等离子体阴极电子枪产生高功率、高密度电子束源的整体方案。分别在连续馈气和脉冲馈气条件下进行实验测试,得到放电电流、收集极电流与气压、脉宽及调制器电压的关系。实验获得电子枪的典型放电电流为150~200 A,脉宽60 μs;传输电子束达到30~80 A,脉宽60 μs。该结果表明该新型等离子体阴极电子枪可以取代材料阴极作为大电流、长脉冲电子束源,特别适用于等离子体加载微波管。 相似文献
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虚火花电子束源研制成功 总被引:6,自引:4,他引:2
虚火花电子束源研制成功王明常,朱俊彪,王之江,张立芬,陆载通,陆宾,冯诚士,黄羽.周慧芬(中国科学院上海光学精密机械研究所,上海201800)高功率,强流密度,高亮度虚火花电子柬源运转成功。近日出束,取得重大进展。座火花放电是在一种特殊结构称为虚火花... 相似文献
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台式拉曼自由电子激光器建议 总被引:2,自引:0,他引:2
提出台式拉曼自由电子激光器的建议,新型台式拉曼自由电子激光器由马克斯发生器、虚火花放电电子束源和小周期波荡器等部分组成。外形尺寸将为传统的拉曼自由电子激光器的1/4至1/5。 相似文献
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开发了氮空心阴极放电PIC/MC二维自洽模型。研究了N2传统空心阴极向微空心阴极放电转变过程中电势和电场的变化。结果表明,不同尺寸的空心阴极放电的电势及电场分布规律几乎类似,但空心阴极孔径减小且气压增加时,电场近似线性增加;典型微空心阴极电场比传统空心阴极放电电场约大3个量级;微空心阴极放电产生的电子,氮分子离子和氮原子离子的密度比传统空心阴极放电约大3个量级,且微空心阴极放电中,N2+密度比N+密度大8倍以上。 相似文献
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《核聚变与等离子体物理》2010,(2)
开发了氮空心阴极放电PIC/MC二维自洽模型。研究了N2传统空心阴极向微空心阴极放电转变过程中电势和电场的变化。结果表明,不同尺寸的空心阴极放电的电势及电场分布规律几乎类似,但空心阴极孔径减小且气压增加时,电场近似线性增加;典型微空心阴极电场比传统空心阴极放电电场约大3个量级;微空心阴极放电产生的电子,氮分子离子和氮原子离子的密度比传统空心阴极放电约大3个量级,且微空心阴极放电中,N2+密度比N+密度大8倍以上。 相似文献
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Ming Chang Wang Chi Yang Byung Cheol Lee Jongmin Lee 《International Journal of Infrared and Millimeter Waves》1999,20(10):1739-1748
A guided field is an important part for focusing the intense beam in Raman free electron laser. A new electron beam source with high brightness of 1012A/(m rad)2 based on a pseudospark discharge was developed [1]. Numerical simulation showed that the guided field for compact free electron lasers could be removed using the new beam source. An electron beam with 12 kA current and 300 kV voltage was obtained. Self-pinch effect of high current beam was observed, the beam propagates 75 cm with constant diameter of 1.5 mm without guided field. 相似文献
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Ming Chang Wang Gun-Sik Park Jae Koo Lee 《International Journal of Infrared and Millimeter Waves》1997,18(4):797-809
An electron beam source based on pseudospark discharge was successful in operation at the beam voltage of 200keV and beam current of 2kA. The detailed design of a compact free electron laser using an electron beam by a pseudospark discharge is described. The
compact free electron laser consists of a smaller Marx generator with 6 capacitors and switches, a water capacitance of 6nF and a beam source with a high brightness of 3×1011
A/(m rad)2. The computer simulation shows that an output power of 101MW is expected at a frequency of 38GHz with a beam energy of 300keV, a current of 2kA and a beam emittance of 48mm mraa. 相似文献
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Gastel M. Hillmann H. Muller F. Westheide J. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1995,23(3):248-253
Investigations on the electron beam current of a free running pseudospark discharge are presented. A single gap system with hollow cathodes of different dimensions is used. The filling gases are argon and helium. The electron beam signal consists of a first pulse with currents of several hundreds of mA and a main pulse with currents up to 20 A. A variation of length and diameter of the hollow cathode significantly influences the pressure range in which a free running pseudospark discharge exists and the peak current of both electron beam pulses. Plasma formation and electron beam generation are studied by high speed photography. The experimental results give some information on the discharge mechanisms that is integrated in a qualitative model of the pseudospark discharge 相似文献
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Pitchford L.C. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1995,23(3):243-247
The emittance and brightness of the electron beam generated during the hollow cathode phase of pseudospark operation are calculated using the two-dimensional hybrid fluid-particle model previously developed to study the time and space development of the plasma in a pseudospark discharge. Two distinct energy components exist in the electron beam; a high-energy component with an energy equivalent to the full discharge voltage and another, broad, low-energy component. In the 100 ns following breakdown and for the conditions of the calculations, the emittance of the high energy component decreases by an order of magnitude and the brightness of the high energy component reaches almost 1010 A/m2 rad2. This work demonstrates the feasibility of using the model to guide the optimization of the pseudospark electron beam properties and shows that the optimum beam properties are achieved after the plasma has filled the hollow cathode and begun to expand radially in the main gap 相似文献
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基于电场递增效应理论,讨论了多极板赝火花脉冲电子束的特征.通过电子束对固体变色片和金属靶的轰击,对赝火花电子束的不稳定性、细丝效应和自箍缩效应等现象做了研究和分析.The characteristics of pulsed electron beam generated by multiplate pseudospark chamber (MPC) on the basis of field escalation effects have been described in this paper. The phenomena such as instability, filament effect, and self-pinch effect of pseudospark electron beam were studied and analyzedby the bombardment of solid evident films and metal targets. 相似文献
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Ming Chang Wang Gun-Sik Park 《International Journal of Infrared and Millimeter Waves》1997,18(6):1187-1198
An analysis of the high voltage power supply removing the Pulse Forming Line (PFL) is presented in this paper. This is an
important improvement to make a desktop free electron laser with about one meter length instead of an original device length
of 5.5 meters and to realize other applications of the new beam source of pseudospark discharge at high voltage of 200kV and a current of 2kA. 相似文献
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Westheide J. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1995,23(3):254-257
An investigation on the pseudospark electron beam is presented in this paper. Time-integrated and time-resolved pictures of the X-rays generated by the electron beam are taken with a special X-ray pinhole camera. They show the spatial and temporal development of the pseudospark electron beam. Time-integrated pictures indicate spatial instabilities of the electron beam caused by a bent or broadened electron beam due to space charge effects. The results of the time-resolved measurements show X-ray emission only during two short periods at the very beginning of the discharge before the beam current reaches its maximum. Only during these periods does the electron beam contain high-energy electrons. In between these two periods the energy of the beam electrons decreases because of a space-charge-limited beam transport 相似文献
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Designofanewpseudospark-producedhigh-brightnesselectronbeamsourceZHUJunbiao;WANGMingchang;WANGZhijiang(ShanghaiinstituteofOpt... 相似文献