Increased performance with 12-mrad sagittal-focusing monochromator

A recently installed large (20 cm) ribbed crystal located 9.8 m from the source of beamline X14A at the NSLS (National Synchrotron Light Source) is capable of collecting 15 milliradians of horizontal divergence. A nearly linear increase in beam flux and intensity is demonstrated for 6 keV radiation up to 12 milliradians but decreases to ∼6 milliradians for 17.5 keV radiation. A focal spot size of less than ∼0.5 mm2 is achieved. Beamline performance has been further enhanced with the acquisition of an ultra-smooth low-figure-error mirror for focusing the vertical beam divergence. These upgrades have resulted in a beam flux of ∼2.0x1012 photons/s at 8 keV and 200 mA