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

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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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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
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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