Optical design of micro-focus X-ray photon correlation spectroscopy beamline at Shenzhen Light Source

Lei，Tao1,2; Tan，Yonggen1,2; Zhang，Zheng1,2; Chen，Siyuan1,2; Feng，Jun1,2

2023-03-01

10.1016/j.nima.2022.168006

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   Impact Factor & Quartile

0168-9002

An optical design study of a beamline proposed for the 3 GeV synchrotron radiation facility, the Shenzhen Light Source, is described. The beamline was designed to cover an energy range from 2.0 to 20 keV with two experimental station, one for X-ray absorption spectroscopy (XAS) experiments and the other for X-ray photon correlation spectroscopy (XPCS) experiments. A 4 m planar undulator with a relatively short magnetic period (20 mm) was used as the radiation source. Horizontally and vertically focusing mirrors separately focus the source along the horizontal and vertical directions, respectively, thus enhancing the flexibility of the beamline. The focus point was employed as the secondary source, and a pair of KB mirrors were used to achieve a near-circular focus spot of about 4.5μm×4.5μm. A Si(111) DCM was selected to produce the monochromatic light that covers the 2.0–20 keV energy range. When the photon energy is lower than 10 keV, the energy resolution can be better than 1.47 × 10 and the total flux is larger than 1 × 10 photons/s. The longitudinal coherence length is in a few μm range. With aperture size adjustment, the transverse coherence length at the sample position is approximately 3μm and the coherent flux is up to 10 phs/s for the photon energy around 2.5 keV. This excellent coherence performance can be applied for the purpose of X-ray photon correlation spectroscopy related experiments.

Beamline Coherence Diffraction-limited source Synchrotron radiation Tender X-ray XPCS

English

First ; Corresponding

PHYSICS

2-s2.0-85145431839

Scopus

1.Department of Materials Science and Engineering,Southern University of Science and Technology (SUSTech),Shenzhen,Guangdong,China
2.Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China

Lei，Tao,Tan，Yonggen,Zhang，Zheng,et al. Optical design of micro-focus X-ray photon correlation spectroscopy beamline at Shenzhen Light Source[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,2023,1048.

Lei，Tao,Tan，Yonggen,Zhang，Zheng,Chen，Siyuan,&Feng，Jun.(2023).Optical design of micro-focus X-ray photon correlation spectroscopy beamline at Shenzhen Light Source.NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,1048.

Lei，Tao,et al."Optical design of micro-focus X-ray photon correlation spectroscopy beamline at Shenzhen Light Source".NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 1048(2023).