Lattice optimization for the HLS-II storage ring
Lattice optimization for the HLS-II storage ring
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DOI：
10.1088/1674-1137/37/1/017001
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发表时间：
2013
影响因子：
3.6
通讯作者：
Zheng-He 正贺 Bai 白;L. Wang 王;Qi-Ka 启卡 Jia 贾;W. Li 李
中科院分区：
文献类型：
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作者：
Zheng-He 正贺 Bai 白;L. Wang 王;Qi-Ka 启卡 Jia 贾;W. Li 李
合肥光源（HLS）的升级项目HLS- ii正在进行中，其中包括其存储环的重建。与现有的HLS存储环相比，HLS- ii存储环具有更低的发射度和更多的直段可用于插入器件。将扫描方法应用于HLS-II存储环的线性晶格优化中，以获得完整的晶格信息。为了减少计算量，使用不同的网格间距值进行多次扫描。此外，在扫描中还包括消色差模式的色六极强度计算，这对非线性晶格优化是有用的。为了更好地分析扫描中得到的解，对晶格性质和四极强度变量进行了统计分析。详细描述了溶液的选择过程，包括工作点的选择、发射度和光学功能的设置以及最大磁体强度的限制。给出了消色差模式和非消色差模式的两个晶格，包括它们的光学功能和优化的动态孔径。
The upgrade project of the Hefei Light Source (HLS), named HLS-II, is under way, which includes the reconstruction of its storage ring. The HLS-II storage ring has lower emittance and more straight sections available for insertion devices as compared with the present HLS storage ring. The scan method is applied to the linear lattice optimization for the HLS-II storage ring to get thorough information about the lattice. To reduce the amount of computation, several scans with different grid spacing values are conducted. In addition, the calculation of the chromatic sextupole strength for the achromatic mode is included in the scan, which is useful for nonlinear lattice optimization. To better analyze the obtained solutions in the scan, the lattice properties and the variables of quadrupole strengths are statistically analyzed. The process of selecting solutions is described in detail, including the choice of the working point, the settings for the emittance and optical functions, and the restriction of maximum magnet strength. Two obtained lattices, one for the achromatic mode and the other for the non-achromatic mode, are presented, including their optical functions and optimized dynamic apertures.