Abstract
The XAFS beamline at Elettra Synchrotron in Trieste combines X-ray absorption spectroscopy and X-ray diffraction to provide chemically specific structural information of materials. It operates in the energy range 2.4-27 keV by using a silicon double reflection Bragg monochromator. The fluorescence measurement is performed in place of the absorption spectroscopy when the sample transparency is too low for transmission measurements or the element to study is too diluted in the sample. We report on the development and on the preliminary tests of a new prototype detector based on Silicon Drift Detectors technology and the SIRIO ultra low noise front-end ASIC. The new system will be able to reduce drastically the time needed to perform fluorescence measurements, while keeping a short dead time and maintaining an adequate energy resolution to perform spectroscopy. The custom-made silicon sensor and the electronics are designed specifically for the beamline requirements.
Highlights
The XAFS (X-ray absorption fine structure) beamline at Elettra Synchrotron in Trieste combines the capability of X-ray absorption spectroscopy (XAS) with X-ray diffraction (XRD) to provide chemically specific structural information
This work reports on the study carried out to design a new fluorescence detector, based on the Silicon Drift Detector technology, able to maintain a short dead time and an adequate energy resolution to perform spectroscopy
In this work we report on the design activity and tests of the prototype detector given by a single Silicon Drift Detector (SDD) sensor coupled to prototypal front-end and backend electronics boards
Summary
The XAFS (X-ray absorption fine structure) beamline at Elettra Synchrotron in Trieste combines the capability of X-ray absorption spectroscopy (XAS) with X-ray diffraction (XRD) to provide chemically specific structural information. The detector must be able to sustain a high count rate with an adequate energy resolution to perform the measurements. It has a single 100 mm2 SDD cell (80 mm2 of effective area with collimation) with an FWHM (Full Width Half Maximum) energy resolution of ∼170 eV for the Mn Kα line at 5.89 keV for a peaking time of 1∼ μs at -70◦C.
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