High-energy-resolution inelastic X-ray scattering spectrometer at beamline 30-ID of the Advanced Photon Source.

Inelastic X-ray scattering is a powerful and versatile technique for studying lattice dynamics in materials of scientific and technological importance. In this article, the design and capabilities of the momentum-resolved high-energy-resolution inelastic X-ray spectrometer (HERIX) at beamline 30-ID of the Advanced Photon Source are reported. The instrument operates at 23.724 keV and has an energy resolution of 1.3-1.7 meV. It can accommodate momentum transfers of up to 72 nm(-1), at a typical X-ray flux of 4.5 x 10(9) photons s(-1) meV(-1) at the sample. A suite of insitu sample environments are provided, including high pressure, static magnetic fields and uniaxial strains, all at high or cryogenic temperatures.