电子束

For a certain output frequency, if a small-period wiggler is used, the electron beam energy requirement will be decreased, so a more compact free-electron laser can be built.

对于一定的输出频率，如果使用小周期波荡器，对电子束能量要求相对降低，因而，可以研制出更加紧凑型的自由电子激光器。

Based on the oscillator configuration of BFEL, a group of practical optical klystron parameters with a suitable beam energy spread has been put forward and the analyses of its saturation power, power spectrum, and tapered wiggler also have been made.

基于北京自由电子激光器的振荡器结构，提出一组对电子束要求适中的光学速调管参数，并对其饱和功率、功率谱、及锥形摇摆器进行研究。

Zirconium oxide films were deposited on SiO2 substrates using high vacuum electron beam evaporation at room temperature.

在室温下采用电子束蒸发的办法制备二氧化锆(ZrO2)薄膜。

In this paper, two high temperature gradient directional solidification apparatus with liquid metal cooling and electron-beam floating zone melting were used.

本文采用LMC和电子束区熔两种高温度梯度定向凝固装置，研究合金成分及工艺参数对初生相析出行为的影响，优化了自生复合材料的制备工艺。

The results show that microstructure of the surface layer after electron beam irradiation consists of four zones,i.e.surface melting zone,phase transformation hardening zone,transition zone and base alloy.

研究结果表明，Cr12MoV模具钢经电子束表面熔凝处理后的显微组织可以明显地划分为四个区域：表面熔化区、相变硬化区、过渡区及合金的基体。

The good characteristics of the deflection system of electron gun can be obtained by optimizing the velocity and the location of emitting electron beam and by the aclinic emission of the electron beam, that can be achieved by making the end of the anode and the middle part of the cathode level.

研究结果表明：电子枪阳极板端点与阴极灯丝中心点保持水平可满足电子水平出射；非均匀分布的磁场对e型电子枪中电子束具有良好的聚焦作用；所设计的偏转聚焦系统在电子束流为50~100 mA时，束斑小于3 mm。

In theory, firstly, the numerical simulation methods, such as the boundary element method, the finite difference method and the finite element method, were utilized to calculate the distribution of electric field intensity and potential of the electron-gun system, the focusing system and the whole equipment, respectively. Then, the trajectories of the electron-beam were traced by using of the Runge-Kutta method and the Monte-Carlo method associatively. The point spread function was also calculated.

在理论分析中，先后采用边界元方法、差分方法、有限元方法等科学数值计算方法，编制程序，对X射线源的电子枪发射系统、聚焦系统以及发射系统与聚焦系统的组合系统等的电场分布进行了严格的计算，在准确求得各系统电场内各个剖分点的电场场强、偏导数等参量的基础上，采用蒙特-卡罗模拟方法和不等距龙格-库塔方法相结合，追踪由LaB_6单晶阴极表面发射出的大量电子束在电场内的运动轨迹，求出点扩展函数，并根据点扩展函数的优劣，反复调节、大量计算对比，挑选出X射线源最佳的电极结构及其组合。

A modified Vlasov equation which describes the evolution of the spatial and momentum distribution of axisymmetrical electron beams is developed based on the statistical dynamics theory.

利用统计动力学方法建立了描述旋转对称电子束的电子空间及动量分布演化的变态伏拉索夫方程，并在一阶旁轴近似下研究出一种半解析计算方法。

Research of high current IREB transport in azimuthally magnetic field.

强流相对论电子束在角向磁场中的传输研究。

By using of the theory and simulation methods above, the inject cavity, buncher cavity and output cavity are analysed separably. With An annual electron beam of voltage 500kV, and current 3kA, average output microwave power 455MW and peak power 1.3GM is observed, bandwidth is 60MHz, the efficiency is 30.3%, the gain is about 36.8dB.and the frequency is 2.85GHz, The amplitude and phase of output microwave is stable.

最后运用上面所得出的一系列理论及模拟方法，分别对相对论速调管的注入腔、聚束腔和输出腔的工作特性进行了详细的分析和优化设计，我们采用3kA和500kV的环形强流相对论电子束，最后得到了工作频率为2.85GHz、饱和增益为36.8dB、效率为30.3％、带宽大约60MHz、平均功率为455MW，峰值功率可达1.3GW的微波输出的相对论速调管，输出微波的幅值平稳，相位稳定。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐