Compact XRF spectrometer for CARNAUBA beamline at SIRIUS

ROBLEDO J. I.; HONNICKE M.; PÉREZ C. A.; SÁNCHEZ J. H.; RIBEIRO R. H.

Campinas

Conferencia; 27th RAU; 2017

CNPEM

We have been working on the design of a compact, high resolution, x-ray spectrometer for CARNAUBA beamline at SIRIUS. The spectrometer is thoroughly designed as Wavelength Dispersive System (WDS) consisting of an integrated conical crystal analyzer and a position sensitive detector. The proposed focusing scheme [1] allows reducing detector area and optical aberrations thus making a very compact design (~16 cm sample?detector distance), similar to that shown by Morishita et.al. [2]. A program written in MATLAB was developed to calculate the main parameters of the x-ray spectrometer such as crystal dimensions, energy resolution, energy bandwidth and peak location at the position sensitive detector. Simulations were also performed using the McXtrace code [3] to confirm previous results from calculations. From the above, we are proposing a x-ray spectrometer consisting of a bent Si(220) wafer of 4.1 cm × 9.6 cm covering an energy range of from 5.3 to 7.1 keV having a resolution of approximately 10 eV in this energy range. For the detection system, three sequential MEDIPIX detectors [4] has been proposed covering an effective area of 14 × 42 mm2. We have also been working on the construction of this first prototype to test it at the XRF-D09B beamline at the LNLS, Campinas, Brazil .