Improvement of ultra-small-angle XPCS with the Extremely Brilliant Source

Recent technical developments and the performance of the X-ray photon correlation spectroscopy (XPCS) method over the ultra-small-angle range with the Extremely Brilliant Source (EBS) at the ESRF are described. With higher monochromatic coherent photon flux ( ∼ 1012   photons   s − 1) provided by the EBS and the availability of a fast pixel array detector (EIGER 500K detector operating at 23000   frames   s − 1), XPCS has become more competitive for probing faster dynamics in relatively dilute suspensions. One of the goals of the present development is to increase the user-friendliness of the method. This is achieved by means of a Python-based graphical user interface that enables online visualization and analysis of the processed data. The improved performance of XPCS on the Time-Resolved Ultra-Small-Angle X-ray Scattering instrument (ID02 beamline) is demonstrated using dilute model colloidal suspensions in several different applications.

Source: Journal of Synchrotron Radiation - November 7, 2023 Category: Physics Authors: Ch è vremont, W. Zinn, T. Narayanan, T. Tags: XPCS coherent X-ray scattering speckle contrast UA-XPCS USAXS research papers Source Type: research