Lattice study for the HLS-Ⅱ storage ring

BAI Zheng-He; WANG Lin; JIA Qi-Ka; LI Wei-Min

doi:10.1088/1674-1137/37/4/047004

Chinese Physics C> 2013, Vol. 37> Issue(4) : 047004 DOI: 10.1088/1674-1137/37/4/047004

Lattice study for the HLS-Ⅱ storage ring

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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.

References

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Helmut Wiedemann. Particle Accelerator Physics. Third Edition. Berlin: Springer-Verlag, 2007. 784[2] Ivanyan M, Martirosyan Y, Tsakanov V. Nucl. Instrum. Methods in Phys. Res. A, 2004, 531: 651[3] BAI Zheng-He, WANG Lin, JIA Qi-Ka et al. Lattice Optimization for the HLS-Ⅱ Storage Ring. Chin. Phys. C (HEP NP), to be published[4] JIA Qi-Ka. Design Consideration of New Insertion Devices of Hefei Light Source. In: Proc. of IPAC 2011. Spain: San Sebastian, 2011. 3284[5] Carlos A. Coello Coello, Gregorio Toscano Pulido, Maximino Salazar Lechuga. IEEE Trans. Evol. Comp., 2004, 8(3): 256

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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

Lattice study for the HLS-Ⅱ storage ring

Corresponding author: BAI Zheng-He,

Corresponding author: WANG Lin,

Received Date: 2012-05-09
Accepted Date: 1900-01-01
Available Online: 2013-04-05

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.