Abstract
The Shanghai soft X-ray Free-electron Laser facility (SXFEL) is now serving as an experimental platform for fundamental free-electron laser (FEL) principal tests. This facility puts very tight tolerances on the straightness of the electron beam trajectory (within 5 μm). It is hard to achieve the required orbit due to the off-axis fields of the misaligned quadrupoles and undulator segments especially for the SXFEL driven by relatively low energy LINAC (840 MeV). The tight tolerances can be met through beam-based alignment (BBA) technique. In this paper, the BBA simulation and preliminary experiment results at SXFEL are presented. To further improve the electron beam trajectory by calculating the undulator misalignment, the feasibility of genetic algorithm (GA) based BBA has been studied.
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