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changes.mady.by.user Mikhail Dubrovin

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New Version 15

changes.mady.by.user Mikhail Dubrovin

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  • averaged over all 14636 events calibrated (pedestal, common mode) data 
  • polarization correction factor 
  • polarization corrected data
  • radial-background subtracted data using single angular bin

    This image indicates on in-correct geometry; background center consistent with beam intersection does not coincide with detector origin (0,0). 
  • radial-background subtracted data using 8 angular bins

  • dynamically apply some geometry correction

    Code Block
        geo = GeometryAccess(fname_geo)
    geo.move_geo('CSPAD:V1', 0, 1600, 0, 0)
    geo.move_geo('QUAD:V1', 2, -100, 0, 0)

    and plot again radial-background subtracted data using single angular bin

    "dish"-like shape disappears.

  • Interpolation (linear) between centers of the background bins

    Code Block
        bkgd  = rb.bkgd_nda_interpol(nda, method='linear') # method='nearest' 'cubic'
    cdata = rb.subtract_interpol(nda, method='linear')
    interpolation for entire detector and for part of the image

  • Image AddedImage AddedImage AddedImage Added

    Image is not as impressive as for polarization-corrected sample, but the residual intensity spread shrinked down to RMS~3 ADU.

CSPAD "dopping" artifacts

  • zoomed-in regions of the last plot
    Image RemovedImage Removedfour quads
     Image AddedImage AddedImage AddedImage Added
    • Shows some "doping" as well as "gray scale gradient" artifacts.

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    • A few smooth curves earlier interpreted as "scratches" apparently become a nice drawing probably on the detector shield. This drawing can be used for alignment.

References

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