Lattice study for the HLS-Ⅱ storage ring

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BAI Zheng-He, WANG Lin, JIA Qi-Ka and LI Wei-Min. Lattice study for the HLS-Ⅱ storage ring[J]. Chinese Physics C, 2013, 37(4): 047004. doi: 10.1088/1674-1137/37/4/047004
BAI Zheng-He, WANG Lin, JIA Qi-Ka and LI Wei-Min. Lattice study for the HLS-Ⅱ storage ring[J]. Chinese Physics C, 2013, 37(4): 047004.  doi: 10.1088/1674-1137/37/4/047004 shu
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Received: 2012-05-09
Revised: 1900-01-01
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Lattice study for the HLS-Ⅱ storage ring

    Corresponding author: BAI Zheng-He,
    Corresponding author: WANG Lin,

Abstract: 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.

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