Expanded energy range and increased flux for high-pressure diffraction

New monochromator installed in the optics enclosure January 2016
New monochromator installed in the optics enclosure January 2016

The diffraction beamline (16-ID-B) monochromotor has been modified to offer a significant increase in the maximum energy range up to 60 keV, and a substantial increase in flux at the nominal operating energy near 30 keV. This was achieved by changing the offset of the branching IDB beamline from 1 m to 0.7 meters. The use of an air-bearing base table for holding the second monochromator crystal also increased the stability and reproducibility for tuning energies. The hutch reconfiguration and monochromator installation were completed in January 2016 and successful commissioning with x-rays was carried out in early February 2016, ready for users’ operation during the first beam cycle of 2016. Figure shows the new monochromator stand in place in the first optics enclosure, ready for final assembly. The higher x-ray energy will give larger coverage in momentum transfer (Q), which is critical in liquid and amorphous studies and in detail structure refinement from single crystal or multigrain crystallography. Furthermore, with the new monochromator, the on-sample flux has been increased by a factor of ~2.3 at the typical operating energy of the beamline. Together with the recently developed 1x2 µm2 focusing capabilities and the high-energy-sensitive detectors on the horizon, the high pressure diffraction capabilities at HPCAT have been significantly enhanced  (Key personnel: Jesse Smith, Stas Sinogeikin, Eric Rod, Guoyin Shen)