Generation of extremely bright, coherent synchrotron radiation in a short wavelength range is of remarkable interest in the synchrotron light source community. In this paper, a novel technique is adopted to produce coherent radiation, which uses an angular dispersion mechanism to enhance the microbunching of electrons by introducing a slight energy modulation in the long straight section of the storage ring. For this purpose, a lattice design of an extreme low emittance storage ring with 3.5 GeV energy is presented in this paper, which employs a higher-order achromat concept. We show the design results of the multibend achromat lattice with an emittance of 20 pm rad and a circumference of 900 m. Numerical simulation results demonstrate that this angular dispersion-induced microbunching scheme can be used to generate coherent radiation near the soft x-ray region, the repetition rate can reach 10 kHz, and the spectral brightness can reach $2.3\times {10}^{24}\mathrm{photons}{\mathrm{s}}^{-1}{\mathrm{mm}}^{-2}{\mathrm{mrad}}^{-2}$ ${(0.1\%\mathrm{bandwidth})}^{-1}$.

中文翻译：

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使用角色散诱导的微团聚方案在衍射受限的存储环中产生非常明亮的相干同步辐射

短波范围内产生极亮，相干的同步加速器辐射引起同步加速器光源界的极大兴趣。在本文中，采用了一种新技术来产生相干辐射，该技术使用角色散机制通过在存储环的长直段中引入轻微的能量调制来增强电子的微束聚。为此，本文提出了具有3.5 GeV能量的极低发射率存储环的晶格设计，该设计采用了高阶消色差概念。我们展示了具有20 pm rad辐射和900 m圆周的多弯曲消色差晶格的设计结果。$2.3\times {10}^{24}\mathrm{光子}{\mathrm{s}}^{-\mathrm{1个}}{\mathrm{毫米}}^{-2}{\mathrm{姆拉德}}^{-2}$ ${（0.1％\mathrm{带宽}）}^{-\mathrm{1个}}$。