NONGAUSSIAN SPECIFICATION FOR THE SPREAD FUNCTION OF A POLYCAPILLARY LENS UNDER ITS AXIAL DISFOCUSING
D. S. Sorokoletov1, Ya. V. Rakshun1, F. A. Daryin1, A. A. Gogin2
1Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2National Research Center “Kurchatov Institute,”, Moscow, Russia
Keywords: x-ray optics, polycapillary lens, controllable retuning of the confocal volume, spread function, approximation, extreme function
Abstract
We have made an attempt to give an exact quantitative description and generalization for the specification of the spatial distribution of the x-ray polycapillary lens' spread function for different cases of the quality of its adjustment along angular and lateral coordinates. We have conducted series of experiments on defining the lens' spread function around the spatial areas whose offset from the focal point along the axial coordinate is large. As a result of analyzing results, we have proposed two approximation models for fitting the spread function with potentially good accuracy in the most appropriate cases of polycapillary lens' adjustment. We have demonstrated that the proposed models are universal and agree with the experimental distribution of the spread function with high accuracy by an example of a detailed analysis of three series of experiments on defining the spread function within large spatial areas after three different cases of polycapillary lens' adjustment.
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