Optics and Precision Engineering, Volume. 15, Issue 12, 1844(2007)
Design of VUV beamline for ARPES studies at SSRF
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~1012phs/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.
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[in Chinese], [in Chinese], [in Chinese], [in Chinese]. Design of VUV beamline for ARPES studies at SSRF[J]. Optics and Precision Engineering, 2007, 15(12): 1844