武汉光源一期工程加速器系统

Accelerator System of Wuhan Light Source PhaseⅠProject

武汉光源一期工程计划建造一台第4代同步辐射装置,由1台1.5 GeV的低能量储存环和1台全能量直线注入器组成。储存环设计周长180 m,由8个标准混合型的7BA磁聚焦结构单元周期组成,能够储存500 mA的1.5 GeV电子。储存环自然发射度优化至222.8 pm·rad,可达到软X射线的衍射极限。为了满足用户对硬X射线的需求,每个标准单元的中心处安装了1台3.5 T的超强二极铁。同时为了提高因发射度减小造成的低寿命和动力学孔径过小造成的注入困难等问题,储存环的设计中还使用了三次谐波腔用于束团拉伸以及替换式注入系统等措施。全能量直线加速器位于储存环地下6 m处,采用S波段加速结构。本文将对武汉光源一期工程加速器系统进行更加详细的介绍。

The accelerator system of Wuhan Light Source(WHLS),a fourth-generation synchrotron radiation facility,its phaseⅠproject consists of a low energy storage ring(1.5 GeV)and a full energy linac injector.Based on hybrid-7BA lattice structure,the storage ring was designed as an 8-cell,500 mA and 1.5 GeV electron synchrotron,with circumference 180 m and nature emittance 222.8 pm·rad,which reaches soft X-ray diffraction limit.At the middle of each standard cell,a 3.5 T super bend magnet was used to extend the photon energy to hard X-ray region.A 3rd harmonic cavity was designed for bunch lengthening to keep sufficient lifetime and swap-out injection scheme was chosen due to the small dynamic aperture.A full energy S-band LINAC,which is 6 meters lower than the storage ring,will be used as its injector.More details of WHLS phaseⅠproject will be described in this paper.