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   µ m (H) × 6   µ m (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.
Source: Journal of Synchrotron Radiation - Category: Physics Authors: Tags: bending-magnet beamline micro-XAFS full-field nano-XAFS full-field transmission X-ray microscopy quick-XAFS HEPS beamlines Source Type: research