A micro‐focusing and high‐flux‐throughput beamline design using a bending magnet for microscopic XAFS at the High Energy Photon Source.

An optical design study of a bending‐magnet beamline, based on multi‐bend achromat storage ring lattices, at the High Energy Photon Source, to be built in Beijing, China, is described. The main purpose of the beamline design is to produce a micro‐scale beam from a bending‐magnet source with little flux loss through apertures. To maximize the flux of the focal spot, the synchrotron source will be 1:1 imaged to a virtual source by a toroidal mirror; a mirror pair will be used to collimate the virtual source into quasi‐parallel light which will be refocused by a Kirkpatrick–Baez mirror pair. In the case presented here, a beamline for tender X‐rays ranging from 2.1 keV to 7.8 keV, with a spot size of approximately 7 µm (H) × 6 µm (V) and flux up to 2 × 1012 photons s−1, can be achieved for the purpose of X‐ray absorption fine‐structure (XAFS)‐related experiments, such as scanning micro‐XAFS and full‐field nano‐XAFS. [ABSTRACT FROM AUTHOR]