Lattice study for the HLS-Ⅱ storage ring  

作　　者：白正贺 王琳 贾启卡 李为民 

机构地区：[1]National Synchrotron Radiation Laboratory,University of Science and Technology of China

出　　处：《Chinese Physics C》2013年第4期87-92,共6页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (11175182, 10979045)

摘　　要：The Hefei Light Source （HLS） is undergoing a major upgrade project, named HLS-Ⅱ , in order to obtain lower emittance and more insertion device straight sections. Undulators are the main insertion devices in the HLS-Ⅱ storage ring. In this paper, based on the database of lattice parameters built for the HLS-Ⅱ storage ring obtained by the global scan method, we use the quantity related to the undulator radiation brightness to more directly search for high brightness lattices. Lattice solutions for achromatic and non-achromatic modes are easily found with lower emittance, smaller beta functions at the center of the insertion device straight sections and lower dispersion in non-zero dispersion straight sections compared with the previous lattice solutions. In this paper, the superperiod lattice with alternating high and low horizontal beta functions in long straight sections for the achromatic mode is studied using the multiobjective particle swarm optimization algorithm.The Hefei Light Source （HLS） is undergoing a major upgrade project, named HLS-Ⅱ , in order to obtain lower emittance and more insertion device straight sections. Undulators are the main insertion devices in the HLS-Ⅱ storage ring. In this paper, based on the database of lattice parameters built for the HLS-Ⅱ storage ring obtained by the global scan method, we use the quantity related to the undulator radiation brightness to more directly search for high brightness lattices. Lattice solutions for achromatic and non-achromatic modes are easily found with lower emittance, smaller beta functions at the center of the insertion device straight sections and lower dispersion in non-zero dispersion straight sections compared with the previous lattice solutions. In this paper, the superperiod lattice with alternating high and low horizontal beta functions in long straight sections for the achromatic mode is studied using the multiobjective particle swarm optimization algorithm.

关 键 词：storage ring LATTICE UNDULATOR BRIGHTNESS EMITTANCE particle swarm optimization 

分 类 号：TL594[核科学技术—核技术及应用]