A separated crystal, fixed-exit monochromator for X-ray synchrotron radiation

Abstract A separated, two-crystal X-ray monochromator has been designed and constructed at CHESS, the Cornell High Energy Synchrotron Source. The device is tunable through a wide range of energies (3.5 to 21 keV with Si(111) crystals) by means of a single axis rotational stage, and maintains a fixed height for the exiting monochromatic beam. The system includes a novel design that allows quick changing and accurate repositioning of the monochromating elements. Details of the construction are presented along with the results of the preliminary testing.