| Tartalmi leírás: |
In order to make the most of the low photon flux in laboratory small-angle X-ray
scattering instruments, the experimental geometry has to be chosen carefully,
with special stress on the beam-shaping system. The optimum collimation
scheme should enable accurate measurements over the desired range of the
scattering variable, while yielding the highest flux and the lowest possible
instrumental background. In order to identify the best setting, a phase-space
optimization of the collimating scheme is carried out in the present work,
including constraints on the beam size at the sample position and on the detector
surface. The resulting formulae are implemented in a Python script with a
graphical user interface, to aid the planning, construction and daily operation of
pinhole small-angle scattering cameras.
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