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 (HOA) concept. We show the design results of the multi-bend achromat (MBA) 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 2.310${}^{24}$ photons s${}^{-1}$ mm${}^{-2}$ mrad${}^{-2}$ (0.1{%} bandwidth)${}^{-1}$. {I. INTRODUCTION} The development of linac-based free-electron laser (FEL) and storage ring-based synchrotron radiation light sources has brought unprecedented revolutionary research tools to the fields of physics, chemistry, life science, and material science, and greatly promoted the development of related science [1]. Linac-based FELs not only have the advantages of ultra-high peak brightness, ultra-short pulse structure, and excellent longitudinal coherence, but also have the ability to continuously adjust the wavelength of the emitted light [2.$-$4]. The emergence of advanced FEL light sources, such extreme ultraviolet (EUV) and X-ray FEL with high energy and high spatial and temporal resolutions, has provided unprecedented tools for detecting the ultra-fast evolution of micro-scale structures. However, the repetition rate of FELs is limited. While this has been addressed to some extent by the development of high repetition rate electron gun and superconducting linac technology, the cost and technical difficulties associated with these developments are quite substantial. Moreover, FEL light sources can generally supply light to only a limited number of experimental stations, which further limits the scope of its applications. In contrast, storage ring-based synchrotron light sources have the advantages wide spectral coverage, high average brightness, high stability, and simultaneous support for multiple users [5]. This technology has undergone three generations of development and evolution since its inception in the 1960s, and is currently moving towards a fourth generation aiming at diffraction-limited storage rings with higher brightness and better transverse coherence. Storage ring-based synchrotron radiation light sources have now become a major scientific platform supporting the multidisciplinary development of basic and applied research. However, the electron bunch length in the storage ring is relatively longer than that in linac, which limits the temporal coherence of the emitted light. One scheme that has been pursued for addressing the issues confronting linac-based FEL and storage ring-based synchrotron radiation light sources has sought to combine these two technologies, and thereby support the …

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（HOA）概念。我们展示了多弯曲消色差（MBA）晶格的设计结果，其辐射度为20 pm rad，周长为900 m。${}^{24}$ 光子${}^{-\mathrm{1个}}$ 毫米${}^{-2}$ 姆拉德${}^{-2}$ （0.1 {％}带宽）${}^{-\mathrm{1个}}$。{一世。引言基于直线加速器的自由电子激光器（FEL）和基于存储环的同步加速器辐射光源的发展，为物理学，化学，生命科学和材料科学领域带来了空前的革命性研究工具，并极大地推动了这一发展相关科学[1]。基于直线加速器的FEL不仅具有超高峰值亮度，超短脉冲结构和出色的纵向相干性的优点，而且还具有连续调节发射光波长的能力[2 .- $ 4]。先进的FEL光源的出现，例如具有高能量和高时空分辨率的极紫外（EUV）和X射线FEL，为检测微尺度结构的超快速发展提供了前所未有的工具。然而，FEL的重复率是有限的。尽管通过高重复频率电子枪和超导直线加速器技术的发展已在某种程度上解决了这一问题，但与这些发展相关的成本和技术难度相当大。而且，FEL光源通常只能将光提供给有限数量的实验站，这进一步限制了其应用范围。相比之下，基于存储环的同步加速器光源具有光谱覆盖范围广，平均亮度高，稳定性高以及同时支持多个用户的优势[5]。自1960年代问世以来，这项技术经历了三代发展和演变，并且目前正朝着第四代方向发展，其目标是具有更高亮度和更好横向相干性的受衍射限制的存储环。基于存储环的同步加速器辐射光源现已成为支持基础研究和应用研究的多学科发展的主要科学平台。但是，存储环中的电子束长度比线性加速器中的电子束长度相对较长，这限制了发射光的时间相干性。为解决基于直线加速器的FEL和基于存储环的同步加速器辐射光源所面临的问题而采取的一种方案已寻求将这两种技术结合起来，从而为…提供支持。基于存储环的同步加速器辐射光源现已成为支持基础研究和应用研究的多学科发展的主要科学平台。然而，存储环中的电子束长度比直线加速器中的电子束长度相对较长，这限制了发射光的时间相干性。为解决基于直线加速器的FEL和基于存储环的同步加速器辐射光源所面临的问题而采取的一种方案已寻求将这两种技术结合起来，从而为…提供支持。基于存储环的同步加速器辐射光源现已成为支持基础研究和应用研究的多学科发展的主要科学平台。但是，存储环中的电子束长度比线性加速器中的电子束长度相对较长，这限制了发射光的时间相干性。为解决基于直线加速器的FEL和基于存储环的同步加速器辐射光源所面临的问题而采取的一种方案已寻求将这两种技术结合起来，从而为…提供支持。