Improving nonlinear performance of the HEPS baseline design with a genetic algorithm

Yi Jiao

doi:10.1088/1674-1137/40/7/077002

Chinese Physics C> 2016, Vol. 40> Issue(7) : 077002 DOI: 10.1088/1674-1137/40/7/077002

Improving nonlinear performance of the HEPS baseline design with a genetic algorithm

Yi Jiao ^,

1.
Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

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Abstract：
A baseline design for the High Energy Photon Source has been proposed, with a natural emittance of 60 pm·rad within a circumference of about 1.3 kilometers. Nevertheless, the nonlinear performance of the design needs further improvements to increase both the dynamic aperture and the momentum acceptance. In this study, genetic optimization of the linear optics is performed, so as to find all the possible solutions with weaker sextupoles and hence weaker nonlinearities, while keeping the emittance at the same level as the baseline design. The solutions obtained enable us to explore the dependence of nonlinear dynamics on the working point. The result indicates that with the same layout, it is feasible to obtain much better nonlinear performance with a delicate tuning of the magnetic field strengths and a wise choice of the working point.
- High Energy Photon Source ,
- nonlinear performance ,
- working point ,
- genetic optimization

References

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Yi Jiao. Improving nonlinear performance of the HEPS baseline design with a genetic algorithm[J]. Chinese Physics C, 2016, 40(7): 077002. doi: 10.1088/1674-1137/40/7/077002

Yi Jiao. Improving nonlinear performance of the HEPS baseline design with a genetic algorithm[J]. Chinese Physics C, 2016, 40(7): 077002. doi: 10.1088/1674-1137/40/7/077002 shu

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Received: 2015-10-08
Revised: 2016-02-19

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Supported by NSFC (11475202, 11405187) and Youth Innovation Promotion Association CAS (2015009)

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Improving nonlinear performance of the HEPS baseline design with a genetic algorithm

Corresponding author: Yi Jiao,

1. Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2015-10-08

Accepted Date: 2016-02-19

Available Online: 2016-07-05

Fund Project: Supported by NSFC (11475202, 11405187) and Youth Innovation Promotion Association CAS (2015009)

Abstract: A baseline design for the High Energy Photon Source has been proposed, with a natural emittance of 60 pm·rad within a circumference of about 1.3 kilometers. Nevertheless, the nonlinear performance of the design needs further improvements to increase both the dynamic aperture and the momentum acceptance. In this study, genetic optimization of the linear optics is performed, so as to find all the possible solutions with weaker sextupoles and hence weaker nonlinearities, while keeping the emittance at the same level as the baseline design. The solutions obtained enable us to explore the dependence of nonlinear dynamics on the working point. The result indicates that with the same layout, it is feasible to obtain much better nonlinear performance with a delicate tuning of the magnetic field strengths and a wise choice of the working point.

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Improving nonlinear performance of the HEPS baseline design with a genetic algorithm

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