The X-ray diffraction method under extreme conditions is the main experimental method of the high pressure beamline, and high pressure imaging and PDF experimental methods are also provided.
The energy range of beamline is from 20keV to 50keV. In order to meet the different experimental needs of users, the focused X-ray spot at sample position is from 150nm (with 0.1m working distance) to 5μm (with >0.5m working distance) in diameter.
To increase the flux at sample position, the pink beam mode with ~0.1% energy resolution and ~1013phs/s flux is set-up during beamline design. The pink beam and mono beam (with 10-4 energy bandwidth) can be switched by tuning the high-heat load double multilayer mirrors (DMM) and the Si (111) double-crystal monochromator (DCM). In order to improve beam stability, the DCM and DMM are vertically placed and the X-ray is diffracted in the horizontal direction. To improve the X-ray focus spot stability at the sample, a secondary light source is placed in the beamline.
There are two experimental tables in the endstation, general purpose table (GPT) and laser heating table (LHT). The GPT configuration allows a wide range of experimental techniques, such as powder/single-crystal/multi-grain XRD, rapid de/compression XRD, under high pressure and at room temperature, high temperature (with external heating) or low temperature (with cryogenic cooling). The LHT is dedicated for in situ double-side laser heating XRD under high pressure.
Director: Li Xiaodong (86-010-88235981 Lixd@ihep.ac.cn )