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为了研究强流脉冲束流在静电加速管中的传输, 采用矩阵法分析了非强流脉冲束流与强流脉冲束流在静电加速管中的传输矩阵, 编写了束流在静电加速管等元件中传输的计算程序ACCT。 用优化方法实现给定的光学条件, 用迭代方法计算强流脉冲束流的空间电荷效应对束流传输的影响以获得自洽解。 在不同束流流强条件下, 利用ACCT、TRACE-3D和TRANSPORT等程序进行了模拟计算, 并对模拟结果进行了比较分析。 模拟结果表明, 提高加速电压比, 可以增强静电加速管的聚焦能力、 减少束流损失和提高传输效率。To study intense pulsed beam transfer in electrostatic accelerate tube, the matrix method was applied to analyze the transport matrixes in electrostatic accelerate tube of non-intense pulsed beam and intense pulsed beam, and a computer code was written for the intense pulsed beam transporting in electrostatic accelerate tube. Optimization techniques were used to attain the given optical conditions and iteration procedures were adopted to compute intense pulsed beam for obtaining self-consistent solutions in this computer code. The calculations were carried out by using ACCT, TRACE-3D and TRANSPORT for different beam currents, respectively. The simulation results show that improvement of the accelerating voltage ratio can enhance focusing power of electrostatic accelerate tube, reduce beam loss and increase the transferring efficiency. 相似文献
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为计算强流脉冲束在螺旋管透镜6维相空间中的非线性传输,用Visual Fortran 6.5语言设计了一个计算程序,计算由漂浮空间、螺旋管透镜等元件组成的束流光学系统。程序在计算非强流脉冲束流的线性传输时,粒子的轨迹通过矩阵的直接相乘计算得出;程序在计算强流脉冲束流的非线性传输时,需要考虑束流中的空间电荷效应对束流传输的影响,在束流运动过程中,空间电荷场也在不断地变化,而且粒子运动的轨迹与空间电荷势又是相互依赖的,因此需要求得一个自洽的解,先把元件分成若干均等的区间,把电流分成若干等份,后采用束流电流迭代与元件区间迭代的计算方法。程序运行结束时,横向和纵向相图以及束流光学系统的束流包络线可以在微机屏幕上直观地显示出来。 相似文献
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强流脉冲束传输的计算是一个相当复杂的问题, 因为不同类型的粒子束分布产生不同的空间电荷场, 而在束流运动过程中, 空间电荷场也在不断地变化, 而且粒子运动的轨迹与空间电荷势又是相互依赖的, 因此需要求得一个自洽解。采用矩阵法分析了非强流脉冲束流与强流脉冲束流在四极磁铁中传输的矩阵, 并编写了束流在四极磁铁等元件中的传输计算程序, 程序采用迭代计算方法获得自洽解。程序运行时, 可以进行直观的图形显示。It is very difficalt to calculate the nonlinear transport of a intense beam, because the particle trajectories depend on the electric potentials excited by the particle beams, and the electric potentials of the beams depend on the particle trajectories and the particle distributions in the phase spaces. So, it is necessary to solve the problem by iterations to get self consistent solutions.We use transport matrix method to analyze the transportation in quadrupole magnet of non intense pulsed beam and intense pulsed beam respectively, and write a computer code for the pulsed beam transporting in quadrupole magnet. The self consistent solution can obtained by using iteration calculation method. During the calculation, the result can be shown by the prompt graph. 相似文献
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用Lie代数方法分析了强流直流柬在螺线管透镜中的传输,考虑了两种情况:一种情况是外磁场力大于空间电荷力,另一种情况是外磁场力小于空间电荷力.得到两种情况下的传输矩阵.分析结果编制成了程序,并计算了ECR离子源之后的束流传输系统. 相似文献
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高同步性的多电子束能够驱动产生有利于实现相位控制的多束微波,是高功率微波功率合成的关键技术。对单台加速器驱动强流同步双阴极二极管进行了模拟,在二极管阻抗约10 W,输入电压442.6 kV条件下,获得了总功率大于20 GW、总束流为47.6 kA、同步时间差小于6 ns的双电子束。开展了轰击不锈钢目击靶实验和同步双电子束诊断实验,双阴极材料为不锈钢,单个阴极长30 mm,两阴极中心间距为100 mm,阴极发射面采用天鹅绒,单阴极半径为20 mm,在阴阳极最大电压为442.8 kV时,束流峰值总和为48.78 kA,双束流同步时间差保持在4~6 ns范围内,实验结果与模拟符合较好。 相似文献
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兰州大学设计研发的ZF-400强流中子发生器设计D-T中子产额6×1012 n/s,主要由ECR离子源、低能束流传输线(LEBT)、加速管、旋转靶等部分组成。LEBT负责将从离子源引出的束流进行分析聚焦并注入到加速管中。LEBT对束流的聚焦及分析的好坏程度决定了加速管中束流的损失程度、中子的产额以及靶的寿命。本工作就该强流中子发生器所需的低能传输线进行了设计。使用螺线管、分析磁铁和四极透镜组合的方案。利用TRACK软件对此方案进行模拟,得到符合要求的束流线及元件的参数。用TraceWin进行了验证模拟,验证结果符合要求。另外,通过软件模拟确定了杂质离子损失的位置,据此设计了束流管道冷却方案。通过模拟发现,这种透镜的组合方式可以让整个LEBT以较低的功率获得低损失、高纯度的打靶束流。The ZF-400 Intense Neutron Generator, which is designed by Lanzhou University with an expected neutron yield of 6×1012 n/s, is consist of ECR ion source, low energy beam transport (LEBT) line, accelerating tube and rotating target. The beam extracted from ECR source is analyzed and focused through LEBT, then, the beam is introduced into the accelerating tube. The focus and analysis ability of LEBT is very important for the beam loss, neutron yield and target's life. A LEBT line for intense neutron generator is designed in this paper, the project consisted of a solenoid, a bend magnet and three quadrupole lens. The qualified LEBT and its parameters have been got through the simulation with TRACK code. Then TraceWin program was employed to check this simulation and the result satisfied our requirement. Besides, the loss position of impurity ions was known through the simulation, and a project of beam line's cooling system was designed according to this result. Through the simulation, we find the optimal lens combination plan which can obtain lower beam loss and higher beam purity at low running power of LEBT. 相似文献
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The intense dc beam nonlinear transport was analyzed with the Lie algebraic method, and the particle trajectories of the second order approximation were obtained. Based on the theoretical analysis a computer code was designed. To get self-consistent solutions, iteration procedures were used in the code. As an example, we calculated a beam line (drift-electrostatic quadrupole doublet-drift). The results agree to the results calculated by using the PIC method. 相似文献
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轴对称光束的克尔透镜矩阵及其在克尔透镜锁模中的应用 总被引:5,自引:2,他引:3
在非线性薛定谔方程的基础上较严格简明地推导了克尔介质的轴对称光束及高斯光束的ABCD传播矩阵,该矩阵可用于设计克尔透镜锁模,以腔二端为平面镜的任意光学系统为例,获得了简单的普遍公式。 相似文献
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The scattering and focusing characteristics of a Gaussian beam with phase distribution is studied by a stepped index Luneberg lens. A model experiment was performed using a six-layer spherical lens. Two kinds of beams, that is, broad and narrow beam are examined for the incident Gaussian beam. We find that focusing effect of a narrow beam is wholly lower than that of a broad beam. The focal point is also shifted toward outer of sphere because of phase lag for the beam source. The spot size equals almost the wavelength for the various beam parameters. 相似文献