Suppression of the emittance growth induced by coherent synchrotron radiation in triple-bend achromats

作     者：黄玺洋 焦毅 徐刚 崔小昊 

作者机构：Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of Sciences 

出 版 物：《Chinese Physics C》 (中国物理C（英文版）)

年 卷 期：2015年第39卷第5期

页      面：86-91页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：Supported by National Natural Science Foundation of China(11475202,11405187) Youth Innovation Promotion Association of Chinese Academy of Sciences(2015009) 

主　　题：coherent synchrotron radiation emittance growth, achromat 

摘      要：The coherent synchrotron radiation （CSR） effect emittance dilution in high-brightness light sources and linear in a bending path plays an important role in transverse colliders, where the electron beams are of short bunch length and high peak current. Suppression of the emittance growth induced by CSR is critical to preserve the beam quality and help improve the machine performance. It has been shown that the CSR effect in a double-bend achromat （DBA） can be analyzed with the two-dimensional point-kick analysis method. In this paper, this method is applied to analyze the CSR effect in a triple-bend achromat （TBA） with symmetric layout, which is commonly used in the optics designs of energy recovery linacs （ERLs）. A condition of cancelling the CSR linear effect in such a TBA is obtained, and is verified through numerical simulations. It is demonstrated that emittance preservation can be achieved with this condition, and to a large extent, has a high tolerance to the fluctuation of the initial transverse phase space distribution of the beam.