Design of an ultra-high resolution and high flux cylindrical grating monochromator undulator beamline

Abstract An ultra-high resolution and high flux 6 m cylindrical grating monochromator (6 m-CGM) undulator beamline, covering the photon energies from 5 to 100 eV, has been designed and constructed at SRRC. Two branches, housing separate entrance slits chosen to provide different incident angles, are used to optimize the overall performance. In each branch, two cylindrical gratings are used with the grating included angle set at 150° and 130°, respectively, to cover low (5–30 eV) and high (15–100 eV) photon energy. Movable entrance and exit slits are used to enhance the beamline performance. The energy resolving power with both slit openings set at 10 μm is expected to reach 90,000 and 40,000 in the low and high energy branches, respectively. A photon flux of 6×10 10 and 3×10 11 photons/s/200 mA can be obtained at the respective energy resolving power of 90,000 and 40,000.