We present a new spectrometer at the Advanced Photon Source for inelastic X
-ray scattering with an energy resolution of 2.2 meV at an incident energy
of 21.6 keV. For monochromatization, a nested structure or one silicon chan
nel cut and one 'artificial' channel cut is used in forward-scattering geom
etry. The energy analysis is achieved by a two-dimensional focusing silicon
analyzer in backscattering geometry. In the first demonstration experiment
s, elastic scattering from a Plexiglas (TM) sample and two dispersion curve
s in a beryllium single crystal were measured. Based on these data sets, th
e performance of the new spectrometer is discussed. Published by Elsevier S
cience B.V.