Lattice optimization for the HLS-Ⅱ storage ring

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

doi:10.1088/1674-1137/37/1/017001

Chinese Physics C> 2013, Vol. 37> Issue(1) : 017001 DOI: 10.1088/1674-1137/37/1/017001

Lattice optimization for the HLS-Ⅱ storage ring

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Abstract：
The upgrade project of the Hefei Light Source (HLS), named HLS-Ⅱ, is under way, whose storage ring will be reconstructed. The HLS-Ⅱ storage ring has lower emittance and more straight sections available for insertion devices compared with the present HLS storage ring. The scan method is applied to the linear lattice optimization for the HLS-Ⅱ storage ring to get thorough information about the lattice. To reduce the computation amount, several scans with different grid spacing values are conducted. And, the calculation of the chromatic sextupole strength for the achromatic mode is included in the scan, which is useful for nonlinear lattice optimization. To better analyze the obtained solutions in the scan, the lattice properties and the variables of quadrupole strengths are statistically analyzed. And, the process of selecting solutions is described in detail, including the choice of the working point, the settings for the emittance and optical functions, and the restriction of maximum magnet strength. Two obtained lattices, one for the achromatic mode and the other for the non-achromatic mode, are presented, including their optical functions and optimized dynamic apertures.

References

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David S Robin, WAN Wei-Shi, Fernando Sannibale. Phys. Rev. ST Accel. Beams, 2008, 11(2): 024002[2] Hardt W, Jager J, Mohl D. A General Analytical Expression for the Chromaticity of Accelerator Rings. CERN PS/LEA/Note 82-5, 1982[3] ZHANG Hao, LI Wei-Min, FENG Guang-Yao et al. Chin. Phys. C (HEP NP), 2012, 36(1): 91[4] Robin D, Safranek J, Decking W. Phys. Rev. ST Accel. Beams, 1999, 2(4): 044001[5] James Kennedy, Russell Eberhart. Particle Swarm Optimization. In: Proc. IEEE Int'l. Conf. on Neural Networks. Piscataway, NJ: IEEE Service Center, 1995. 1942[6] BAI Zheng-He, WANG Lin, LI Wei-Min. Enlarging Dynamic and Momentum Aperture by Particle Swarm Optimization. In: Proc. of IPAC 2011. Spain: San Sebastian, 2011. 948[7] Tan Y R E, Boland M J, LeBlanc G. Applying Frequency Map Analysis to the Australian Synchrotron Storage Ring. In: Proc. of 2005 PAC. USA: Knoxville, 2005. 407[8] Borland M. Elegant: A Flexible SDDS-Compliant Code for Accelerator Simulation. APS LS-287, 2000

[1] Xu Jianming . Matching Problem of Lattice with Transverse Coupling. Chinese Physics C, 1995, 19(1): 73-81.
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BAI Zheng-He, WANG Lin, JIA Qi-Ka and LI Wei-Min. Lattice optimization for the HLS-Ⅱ storage ring[J]. Chinese Physics C, 2013, 37(1): 017001. doi: 10.1088/1674-1137/37/1/017001

BAI Zheng-He, WANG Lin, JIA Qi-Ka and LI Wei-Min. Lattice optimization for the HLS-Ⅱ storage ring[J]. Chinese Physics C, 2013, 37(1): 017001. doi: 10.1088/1674-1137/37/1/017001 shu

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Received: 2012-02-20
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 optimization for the HLS-Ⅱ storage ring

Corresponding author: BAI Zheng-He,

Corresponding author: WANG Lin,

Received Date: 2012-02-20
Accepted Date: 1900-01-01
Available Online: 2013-01-05

Abstract: The upgrade project of the Hefei Light Source (HLS), named HLS-Ⅱ, is under way, whose storage ring will be reconstructed. The HLS-Ⅱ storage ring has lower emittance and more straight sections available for insertion devices compared with the present HLS storage ring. The scan method is applied to the linear lattice optimization for the HLS-Ⅱ storage ring to get thorough information about the lattice. To reduce the computation amount, several scans with different grid spacing values are conducted. And, the calculation of the chromatic sextupole strength for the achromatic mode is included in the scan, which is useful for nonlinear lattice optimization. To better analyze the obtained solutions in the scan, the lattice properties and the variables of quadrupole strengths are statistically analyzed. And, the process of selecting solutions is described in detail, including the choice of the working point, the settings for the emittance and optical functions, and the restriction of maximum magnet strength. Two obtained lattices, one for the achromatic mode and the other for the non-achromatic mode, are presented, including their optical functions and optimized dynamic apertures.