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Measurements at LNLS with Thin Timepix assemblies

Measurements at LNLS with Thin Timepix assemblies. Mathieu Benoit . Outline. Experimental facilities Measurements Data Analysis and impact on Calibration . LNLS Experimental facilities. For our measurements we use 3 beam lines : SAXS1 (Pinhole experiment)

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Measurements at LNLS with Thin Timepix assemblies

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  1. Measurements at LNLS with Thin Timepix assemblies Mathieu Benoit

  2. Outline • Experimental facilities • Measurements • Data Analysis and impact on Calibration

  3. LNLS Experimental facilities • For our measurements we use 3 beam lines : • SAXS1 (Pinhole experiment) • Energy Resolution 10% (8 +-0.8 keV) • 1E12 photons/s • Divergence 900 x32 urad @ 8keV • XAFS1 (Energy scan for single pixel calibration) • Energy range 4-15 keV Resolution : 0.0001% • Beam Size 1x1 mm2 • 1e9 photons /s @ 7 keV • MX1 (Pinhole and Fluorescence calibration) • Energy = 7.7keV + harmonics • 1e12 photons /s • Various targets for calibration • 15 beam lines in operation : • X-Ray diffraction (XRD) • Crystallography (MX) • Small Angle X-Ray Scattering (SAXS) • X-Ray Absorption and Fluorescence (XAFS)

  4. Fluorescence measurements (MX1) X-Ray beam (7.9,15.8 keV) 1e12 photons/ s Target Timepix+FITPix Fluorescent photons field ~ 1000 single pixel clusters per pixel / 50k frames (1ms integration) -> ~30-45 min per fluo Only tested with one assembly (A06-W0110) but possibility to run multiple assemblies at the same time (Large Fluorescence radiation field )

  5. Single Pixel TOT Spectrum First Harmonic scattered

  6. Calibration Curve

  7. Single Pixel Energy Spectrum First Harmonic scattered

  8. Application to testbeam data Old Calibration New Calibration By Sophie Redford

  9. Application to testbeam data Old Calibration New Calibration By Sophie Redford

  10. Impact on resolution • Resolution in X, 2 hit cluster: 5.124 um -> 4.893 um • Resolution in Y, 2 hit cluster: 4.986 um -> 5.265 um • Resolution in X 4 hit cluster: 6.269 um -> 6.166 um • Resolution in Y 4 hit cluster: 6.211 um -> 6.481 um

  11. Energy Measurements with monochromator (XAFS1) X-Ray incident beam goes to Crystal Monochromator and is then delivered to the experimental area. Energy can be selected with 0.1keV accuracy along the 5-15 keV range. 2 sensors (C04-W0110,D09-W0126) were tested in this beamline to obtain single pixel calibration for a subset of pixel (beam 2.5x3mm2) Analysis on one of the sample will be presented by MateusVincente for UFRJ

  12. Single Pixel TOT Spectrum I cant see the 5-8 keV photon peak, Double count peaks are however visible

  13. Global Surrogate Fit

  14. Issues with current measurements and further steps • Global calibration seems to work nicely with C04-W0110 , however it is not the case for the two assemblies tested with the monochromator. • Next steps : • Feedback to LNLS to understand better the X-Ray content of the beam • Pixel per pixel analysis to see if results can be improved • Use better fit method with convolution of the surrogate and gaussian as the data point are in the lower energy region

  15. Conclusion • First measurements at LNLS were conducted successfully, and 3 set of measurements were performed • Fluorescence • Pinhole experiment • X-Ray spectroscopy with monochromator • First results already brought improvement to our calibration and gave more insight on the behavior of the device. More work is needed to refine the results and extract single pixel information

  16. Thanks to the test beam team from LNLS and UFRJ !!

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