SHINE, as the first hard x-ray free-electron-laser (FEL) facility in China, is designed to provide high-brightness FEL lasing under high-repetition-rate operation mode. In order to drive x-ray FEL pulses with high qualities, the photoinjector section is deployed to provide the specified electron beam with low transverse emittance and high brightness. Normally the multi-objective optimization algorithm is employed in the injector beam dynamics design. In this paper, the many-objective optimization algorithm NSGA-III is introduced to the injector physical design for optimizing the 4 beam quality properties for the first time. The results of the optimization are presented and analyzed. The application of NSGA-III can provide guidance for further physical research as well as improve the beam dynamics optimization efficiency.
@article{arxiv.2105.13157,
title = {Many-Objective Beam Dynamics Optimization for High-Repetition-Rate XFEL Photoinjector},
author = {Zihan Zhu and Jiawei Yan and Duan Gu and Qiang Gu},
journal= {arXiv preprint arXiv:2105.13157},
year = {2021}
}