X-ray microbeams based on Kumakhov polycapillary optics and its applications: Analytical consideration 19
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X-ray microbeams based on Kumakhov polycapillary optics and its applications: Analytical consideration 19

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In our case the focus spot
cannot be considered as a point, but can be considered as a set of point sources with
smaller intensity
W0 = W1 + W2 + . . . + Wn. (5)
Expression for the intensity captured by a capillary is characteristic for each point source.
Therefore
Win = W1θ2
κp4 + W2θ2
κp4 + . . . + Wnθ2
κp4
= (W1 + W2 + . . . + Wn) θ2
κp4 = W0θ2
κp4. (6)