Beam dynamics study of the photoinjector at Wuhan advanced light source  

作　　者：Ze-Yi Dai Yuan-Cun Nie Jian-Hua Zhong Lan-Xin Liu Zi-Shuo Liu Jia-Bao Guan Ji-Ke Wang Yuan Chen Ye Zou Hao-Hu Li Jian-Hua He 

机构地区：[1]The Institute for Advanced Studies,Wuhan University,Wuhan,430072,China

出　　处：《Radiation Detection Technology and Methods》2024年第3期1319-1332,共14页辐射探测技术与方法（英文）

基　　金：supported by Science and Technology Major Project of Hubei Province in China(2021AFB001).

摘　　要：Background A full-energy LINAC is under development at Wuhan Advanced Light Source(WALS)to provide beams for the 1.5 GeV storage ring proposed as a fourth-generation synchrotron radiation light source and a future free electron laser(FEL)facility.The LINAC starts from a photoinjector that is able to produce electron beams with low emittance(<1 mm·mrad),small relative energy spread(<0.5%),and high bunch charge(~1 nC).Purpose and methods To minimize the output emittance and RMS bunch length for the purpose of improving the photoinjector brightness,the influence of different laser pulse profiles on the slice emittance is investigated,and the beam dynamics simulation is performed with non-dominated sorting genetic algorithm-II(NSGA-II)combining with ASTRA code to find the optimal solution at a bunch charge of 1 nC.Results and conclusion In this paper,the beam dynamics optimization of the photoinjector is presented in detail;the simulation results imply that the laser pulse profile with 1σtruncated Gaussian distribution in transverse and flat-top-like temporal distribution is beneficial to the improvement of beam brightness of the photoinjector,which shows an output emittance of 0.63 mm·mrad in the case of intrinsic thermal emittance of 0.43 mm·mrad.

关 键 词：PHOTOINJECTOR Beam dynamics optimization Beam emittance Driving laser NSGA-II algorithm 

分 类 号：TL5[核科学技术—核技术及应用]