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Tune optimization is necessary to optimize the nonlinearity of the third generation light source storage ring. In this paper we summarize the common strategies for choosing a tune and discuss tune op-timization. Frequency Map Analysis (FMA) is applied as a tune scanning tool to reveal information about nonlinear resonances and guide the tune optimization. The Shanghai Synchrotron Radiation Facility (SSRF) storage ring is taken as a test lattice, and the optimum solutions are presented in this paper. Moreover, the third order regular structural resonances excited by sextupoles are particularly investigated, and it is found that these resonances distort the tune shifts with amplitude and show a stop-band like the linear structural resonances. 相似文献
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周雪梅 《中国物理C(英文版)》2009,33(Z2):78-82
The Shanghai Synchrotron Radiation Facility (SSRF) is a low emittance third-generation synchrotron radiation light source. Some optics parameters of the storage ring were measured when commissioning. This report presents the common methods for measuring some optics parameters of the storage ring, including the betatron tune, beta function, chromaticity, natural chromaticity and dispersion. The results and analysis of measurement for the optics parameters are given here, which are indispensable for the orbit correction of the accelerator and the nonlinear optimization. 相似文献
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Measurement of optics for the SSRF storage ring in commissioning 总被引:1,自引:0,他引:1
The Shanghai Synchrotron Radiation Facility (SSRF) is a low emittance third-generation synchrotron radiation light source. Some optics parameters of the storage ring were measured when commissioning. This report presents the common methods for measuring some optics parameters of the storage ring, including the betatron tune, beta function, chromaticity, natural chromaticity and dispersion. The results and analysis of measurement for the optics parameters are given here, which are indispensable for the orbit correction of the accelerator and the nonlinear optimization. 相似文献
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基于ARM和CPLD的NMR谱仪前放控制设计 总被引:1,自引:1,他引:0
提出了一种基于ARM(Advanced RISC Machine,先进精简指令计算机)和CPLD(Complex Programmable Logic Device, 复杂可编程逻辑器件)的NMR(Nuclear Magnetic Resonance,核磁共振)谱仪前放控制系统设计方案. 该控制系统以ARM为控制核心、 CPLD为控制命令执行单元, 控制前置放大器和混频器的工作状态. 本电路包括以下主要功能:1) 前置放大器收发切换的门控信号电平转换;2) 氘梯度匀场时身频通道自动切换;3) 探头调谐的信息显示;4) 锁前放和混频器的配置. 该设计方案具有系统运行速度高、 控制灵活和成本低的优点,并且可以有效减小系统噪声,降低控制部件对前置放大器和混频器的干扰. 相似文献
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独立开发并行的正负电子储存环的束束效应模拟程序SBBE?.通过求解自由空间内的Poisson方程计算束束作用力;单圈的传输映射中引入了辐射阻尼效应和随机效应.使用它对BEPC中的束束效应进行了计算模拟,并与实测数据进行比较.结果表明,SBBE可以较好地再现BEPC中由束束效应所引发的现象,具备一定的预言能力.本工作为BEPCⅡ的束束效应模拟研究. 相似文献
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已有的和建造中的对撞机的运行常常被束-束相互作用引起的非线性效果所限制,特别是大流强的束流,如正在研究中的BEPC多束团对撞方案,BEPCⅡ上的束-束相互作用非常复杂,束团除了在南对撞点正撞外,还在环上其余11个位置有远程相互作用,本文计算了远程束-束相互作用的频移和频散。 相似文献