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

An ultra-high resolution and high flux 6m cylindrical grating monochromator (6m-CGM) undulator beamline, covering the photon energies from 5 to 100eV, has been designed and constructed at SRRC. Two branches, housing separate entrance slits chosen to provide different incident angles, are used to opt imize the overall performance, In each branch, two cylindrical gratings are used with the grating included angle set at 150 degrees and 130 degrees, r espectively, to cover low (5-30 eV) and high (15-100 eV) photon energy. Mov able entrance and exit slits are used to enhance the beamline performance. The energy resolving power with both slit openings set at 10 mum is expecte d to reach 90,000 and 40,000 in the low and high energy branches, respectiv ely. A photon flux of 6 x 10(10) and 3 x 10(11) photons/s/200 mA can be obt ained at the respective energy resolving power of 90,000 and 40,000. (C) 20 01 Elsevier Science B.V. All rights reserved.