Open AccessComparison of optimization methods for hybrid seven-bend-achromat lattice design
Author(s) -
Penghui Yang,
Zhenghe Bai,
Jiali Xu,
Jiajia Tan,
L Wang
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1350/1/012031
Subject(s) - achromatic lens , nonlinear system , thermal emittance , lattice (music) , nonlinear programming , optics , computer science , physics , mathematical optimization , algorithm , mathematics , statistical physics , quantum mechanics , beam (structure) , acoustics
Generally, for a hybrid multi-bend-achromat (MBA) lattice with fixed linear optics, there is little potential to further optimize the nonlinear dynamics due to limited free knobs. To obtain a hybrid MBA lattice with better nonlinear dynamics performance, it is better to consider some indicators of nonlinear dynamics as objective functions in designing the linear optics using an optimization algorithm. In this paper, integral strengths of sextupoles and natural chromaticities are used as the nonlinear dynamics indicators, and different optimization methods with both or either of the two indicators are carried out and compared. As an example, a hybrid 7BA lattice with an energy of 2.4 GeV is designed towards an emittance of less than 70 pm-rad.