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Description
Abstract: As a next-generation imaging atmospheric Cherenkov telescope array, the mirror of LACT (Large Array of imaging atmospheric Cherenkov Telescope) serves as the core component of its optical system and is critical to achieving the desired technical performance. This report elaborates on the installation and alignment of the LACT mirror. For the Davies-Cotton structured mirror array, an innovative "pitch-replacement handling method" was developed to overcome installation challenges in constrained sites. A QR code-based data management system was also implemented to enable precise lifecycle tracking and management of the mirrors. For pointing alignment , the combined application of the "double focal length method" and "defocused imaging method" optimized the imaging spot size to approximately 11.5 mm, meeting the design specifications. These efforts establish a solid foundation for the high-precision optical alignment of LACT and provide valuable technical references for the installation and alignment of future large-scale mirror arrays.
