A fixed exit sagittal focusing monochromator utilizing bent single crystals

Abstract We have constructed and tested a tunable two crystal, horizontally focusing monochromator for use with synchrotron radiation. Horizontal focusing is achieved by using a segmented rectangular crystal especially cut to have the bending properties of a triangular plate. The bending device was designed to maintain axial symmetry around the central ray independent of bend radius. The entire crystal and bending device is so arranged that, coupled with the first crystal, a fixed exit beam height is maintained for all energies. Other innovative features such as an automatic translation seek circuit will be discussed.