The Beamline Optical Design Principles and the Key Techniques Development at HALF

The Hefei Advanced Light Facility (HALF) is a diffraction-limited storage ring (DLSR). With high coherence and high brilliance, the construction of beamlines that need ultra-high spectral resolving power and high coherence becomes possible. These will put high requirements on beamline construction. The requirements for beamline engineering design and construction need to be specified during the optical design process, including surface quality requirements for optical components (e.g., error budget), mechanical resolution and vibration requirements, methods for beamline performance testing, etc. This paper will introduce the beamline optical design principles and the key technique development at HALF.