Integration of freeform three-mirror KASI deep-rolling-imaging fast telescope

We are in the process of developing the KASI Deep Rolling Imaging Fast Telescope Generation 1 (K-DRIFT G1) based on the on-site performance assessment of the K-DRIFT pathfinder. This telescope is a confocal off-axis freeform three-mirror system designed for the detection of extremely low surface brightness structures in the sky. The optical specifications of the K-DRIFT G1 are as follows: the entrance pupil diameter is 300 mm, the focal ratio is 3.5, and the field of view is 4.43° × 4.43°. During the integration stage, we measured the position of those mirrors, flexures, and bezels by using a coordinate measuring machine. Following the system integration, we will measure wavefront errors at several edge fields using an interferometer at 633 nm. We will get alignment solutions through the measured wavefront errors. In this paper, we briefly present the current status of integrating the K-DRIFT G1 and the future plans for the project.