X-ray microbeams based on Kumakhov polycapillary optics and its applications: Analytical consideration 25
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X-ray microbeams based on Kumakhov polycapillary optics and its applications: Analytical consideration 25

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2.3 Gain of flux density
It is possible to estimate the gain of flux density radiation at the exit of the polycapillary
structure using the following expression:
G = WoutWdiaf = WinTrWdiaf
= W0 θ2
κp4 Tr(W0 rdiaf(2 ( fin + L))2
)
= θ2
cr4 Trrdiaf(2 ( fin + L))2
=
 θcr
rdiaf( fin + L)
2
× Tr
θcr ( fin + L)
rdiaf

2
× Tr , (10)
where Wdiaf is the intensity of radiation which would pass through a diaphragm of the
same size as the beam and given in eq. (9).