| BEPCII横向束流反馈系统前端电子学 |
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| 引用本文： | 季小玲,刘雅静,吕百达.BEPCII横向束流反馈系统前端电子学[J].强激光与粒子束,2005,17(6):0-807. |
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| 作者姓名： | 季小玲 刘雅静 吕百达 |
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| 作者单位： | 1.中国科学院 高能物理研究所, 北京 1 00049 |
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| 基金项目： | 国家863计划项目资助课题，四川省教育厅自然科学基金资助课题 |
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| 摘 要： | 选择了一台商业化的前端电子学RFTF（radio frequency front-end for transverse feedback system）用于BEPCII横向束流反馈系统, 这是跟进世界先进加速器技术的具体实施。在BEPC同步运行模式下对RFTF的性能进行了测试实验，结果表明使用RFTF可以得到理想的波形，能够满足BEPCII横向反馈系统的需要，但是，当储存环出现不稳性时，系统无法正常工作，这就要求BEPCII纵向不稳定很小或者用纵向反馈系统来抑制存在的纵向不稳定。
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| 关 键 词： | 横向束流反馈系统 前端电子学 工作模式 远控 |
| 文章编号： | 1001-4322(2005)06-0801-07 |
| 收稿时间： | 2004/10/28 |
| 修稿时间： | 2004年10月28 |
Comparison of two numerical simulation methods for hard-edged diffracted beams |
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| JI Xiao-ling,LIU Ya-jing,U Bai-da.Comparison of two numerical simulation methods for hard-edged diffracted beams[J].High Power Laser and Particle Beams,2005,17(6):0-807. |
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| Authors: | JI Xiao-ling LIU Ya-jing U Bai-da |
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| Affiliation: | 1.Institute of High Energy Physics,Chinese Academy of Sciences,P.O.Box 918-9,Beijing 100049,China |
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| Abstract: | By using the methods of matrix representation and complex Gaussian function expansion, the recurrence propagation formulae of a flattened Gaussian beam through multi-apertured optical ABCD systems are derived. Numerical examples are given to compare the two numerical simulation methods. It is shown that the form of matrix formulae is simple, and the matrix formulation is the applicable to the Fraunhofer and Fresnel regions. However, this method is suited only to circularly symmetric optical beams and systems. On the other hand, the form of formulae derived by the method of complex Gaussian function expansion is complex, and its calculation errors become noticeable in the near Fresnel region closer to the aperture. But this method is suited to both circularly symmetric and circularly un-symmetric optical beams and systems. In addition, both methods reduce the computational time greatly in comparison with the direct integration of the Collins formula. |
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| Keywords: | Hard-edged diffracted beam Propagation equation Matrix representation Complex Gaussian function expansion |
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