新西伯利亚第四代光源SKIF的晶格优化
Lattice optimization of the Novosibirsk fourth-generation light source SKIF
摘要：
讨论了正在新西伯利亚建设的第四代光源SKIF（西伯利亚圆光子源）的磁晶格选择和参数优化。本研究比较了几种基本的晶格单元，以期得到一种具有低发射度和大动态孔径的晶格单元。在束流能量为3GeV、周长为476 m的条件下，得到了自然发射度为72 μ m的SKIF晶格。只有两个六极子系列的水平和垂直动态孔径分别为12mm和3.5mm，能量接受率大于5%。为了检查所找到的解决方案的潜力，我们使用稍微修改的SKIF晶格来设计6 GeV光源，并在1075 m周长和40个直段上达到33 pm的自然发射度。同样，只有两个六极系列保证足够的动态孔径（7毫米水平，4毫米垂直）和能量接受超过5%的简单有效的注入和足够的束流寿命。
英文摘要：
We discuss the choice of the magnetic lattice and parameter optimization of the fourth generation light source SKIF (Russian acronym for Siberian Circular Photon Source) under construction in Novosibirsk. The study compares several basic lattice cells to procure one with low emittance and large dynamic aperture. The result is a developed lattice of SKIF with 72~pm natural emittance (at zero beam current and absent betatron coupling) at 3 GeV beam energy and 476 m circumference. Only two families of sextupoles provide horizontal and vertical dynamic apertures of 12 mm and 3.5 mm respectively and energy acceptance more than 5\%. To check the potential of the found solution, we used slightly modified SKIF lattice to design 6 GeV light source and reached 33 pm natural emittance for 1075 m circumference with 40 straight sections. Again, only two sextupole families ensure sufficient dynamic aperture (7 mm horizontal, 4~mm vertical) and energy acceptance more than 5\% for simple efficient injection and sufficient beam lifetime.
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