XPD is designed to operate two independent branch lines simultaneously. In the main branch (XPD-2), the upstream endstation hosts a three-circle diffractometer fitted with a flat scintillator panel (16-inch field of view, 200 micron pixels) detector, a 10x15mm2 photon-counting detector (130 micron pixels) and a high-resolution detector bank (8 channels with analyzer crystals) to cover most powder diffraction measurements. A robotic sample changer and a wide range of sample cells (furnaces, cryostats, flow cells, etc.) are available.
The downstream endstation of XPD-2 (not in use yet) will accommodate more elaborate/complex setups: large pressure cells, non-routine reaction chambers, combined spectrometry, gas handling, user-defined specific devices.
The XPD-1 side station (not in use yet) will operate at fixed high energies (39, 64 or 75 keV), optimized for total scattering measurements over a large Q range. The combination of XPD-1 with this XPD-2 complementary parallel-operation station dedicated to high-Q, pair distribution function studies will permit determination of both long- and short-range structures.
XPD addresses future scientific challenges in, for example, hydrogen storage, CO2 sequestration, advanced structural ceramics, catalysis, and materials processing.