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Figure 4
Linearity of λ versus detector input rate. The mean number of photons per pulse (λ) due to air scattered X-rays as determined by the Poisson fits (e.g. Figs. 2[link] and 3[link]) are plotted against the direct beam flux generating the air scattering. Triangles denote data acquired with the detector positioned farther from the direct beam, whose intensity was adjusted by changing the beam-defining slits. Squares denote equivalent data with the detector positioned closer to the beam. The right axis gives the equivalent number of photons per second for the 13 MHz synchrotron bunch frequency. y-axis error bars show the range over which no change is observed in the best fit of the Poisson model to the data; x-axis error bars due to incident beam intensity fluctuations are smaller than the symbols. (The ion chamber output was corrected for a small offset, ensuring the linear fit goes through the origin.)

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 32| Part 3| May 2025|
https://doi.org/10.1107/S1600577525002462
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