ABOUT THIS BEAMLINE
The XAFS2 beamline is an experimental station dedicated to X-ray Absorption Spectroscopy in the hard x-rays energy range (3.5 to 17.0 keV). It focus on the study of the atomic-level structure as well as in the electronic and magnetic properties of matter, with applications in a wide range of scientific fields, such as atomic and molecular physics, chemistry, biology, environmental and geosciences and cultural heritage. Experimental techniques available include Fluorescence Spectroscopy, X-ray Excited Optical Luminescence, X-ray Reflectivity and Combined X-ray Absorption Fine Structure and X-Ray Diffraction.
The XAFS2 is a general-purpose X-ray absorption beamline. Since the completion of the commissioning works in 2007, a large number of users have been using this experimental facility in order to perform several kinds of experiments in different scientific areas. After approximately 7 years in operation this beamline has been substantially updated in order to improve its experimental possibilities. A 4-circle Huber diffractometer has been recently incorporated to perform combined experiments. This equipment collects XRD patterns with the XAFS.
Through the development of a new sample environment, it is now also possible to perform these measurements in situ/operando conditions. Other upgrades include a complete remodeling of the beamline software and its control system. The control system of the beamline has been renovated by the installation of a PXI. The PXI is from National Instruments (PXI-NI) and communicates with Galil/Parker controllers on an EPICS platform. Some parts of the motors were changed in order to improve performance with the upgrade and there were also important changes to the control hardware. The Windows operational system was replaced with Red Hat Linux and the 3-WinDCM control system with EPICS. Furthermore, a new python based script (Py4Syn) was added. This provides high-level abstraction for device manipulation, scan routines, real-time plots and more. This package was created with the aim of providing a simple yet powerful tool to allow scientists and users to develop their own scripts for data acquisition. For user-friendly interface builds a Control System Studio (CS-Studio) is used. The next step with the XAFS2 upgrade, namely, towards a high-throughput XAFS beamline, will involve testing the viability of performing QEXAFS.