Simulation study of beam-beam effects
Simulation study of beam-beam effects
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DOI：
10.1103/physrevstab.8.074402
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发表时间：
2005-07
影响因子：
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通讯作者：
张沅;陈利民;Y. Zhang;K. Ohmi;Lm Chen
中科院分区：
文献类型：
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作者：
张沅;陈利民;Y. Zhang;K. Ohmi;Lm Chen
北京正负电子对撞机将升级为北京正负电子对撞机II，光度将提高约100倍。我们开发了一个三维强-强PIC程序来研究北京正负电子对撞机II的束流效应。通过弧线的传输与平田的弱-强代码中的传输相同。采用傅立叶分析和循环约化方法，通过求解泊松方程直接计算梁-梁力，并通过循环卷积计算边界势。有限束团长度效应被纵向切片所包含。在模拟中使用内插方案来减少所需的切片数目。标准消息传递接口用于并行化代码。计算时间随着(n+1)的增加而线性增加，其中n是切片数目。北京正负电子对撞机II在设计工作点的计算光度接近设计值的50%。根据调查，调音空间中最好的区域在(0.505，0.57)附近，那里的光度接近设计的80%。
The Beijing Electron-Positron Collider (BEPC) will be upgraded to BEPCII, and the luminosity will be about 100 times higher. We developed a three-dimensional strong-strong PIC code to study the beam-beam effects in BEPCII. The transportation through the arc is the same as that in Hirata's weak-strong code. The beam-beam force is computed directly by solving the Poisson equation using the Fourier analysis and cyclic reduction method, and the boundary potential is computed by circular convolution. The finite bunch length effect is included by longitudinal slices. An interpolation scheme is used to reduce the required slice number in simulations. The standard message passing interface is used to parallelize the code. The computing time increases linearly with (n+1), where n is the slice number. The calculated luminosity of BEPCII at the design working point is similar to 50% of the design value. The best area in the tune space is near (0.505,0.57) according to the survey, where the luminosity is similar to 80% of the design.