Vacuum ultraviolet (VUV) beamlines have been playing an important role in studying the electronic structure of solids. Until now

over 30 VUV beamlines for Angle-resolved Photoemission Spectroscopy (ARPES) studies have been built in the synchrotron radiation facilities of US

Japan and Europe. In this work

we present a design of a high-resolution and high-flux VUV beamline covering 5~140 eV photon energy range at Shanghai Synchrotron Radiation Facility(SSRF) for ARPES studies. A quasi-periodic Elliptical Polarized Undulator (EPU) with 14 periods and each 0.32 m long is used as the source. A Dragon-type monochromator with two branches

a lower energy branch covering 5~32 eV and a higher one covering 25~140 eV

is employed. Calculations show that the total resolutions of the monochromator can reach up to 15 000~100 000 with entrance/exit slit openings of 5/5 μm and the ultimate flux of the s-polarized photon on a sample exceeds ~10

12

phs/s. The figure slope errors dominate the total resolution limit of the monochromator. Ray-tracing simulations show that the designed beamline has a good focusing performance. This beamline will be the first VUV beamline constructed at SSRF and will provide valuable experience for future constructions.