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SUMMARY:The nongaussian behaviour of the spread function of the x-ray poly
 capillary lens: characteristical cases and new nonstandard approximation m
 odels
DTSTART;VALUE=DATE-TIME:20200713T140500Z
DTEND;VALUE=DATE-TIME:20200713T140600Z
DTSTAMP;VALUE=DATE-TIME:20260419T145439Z
UID:indico-contribution-1849@indico.inp.nsk.su
DESCRIPTION:Speakers: Dmitry Sorokoletov ()\nThe spread function of a x-ra
 y polycapillary lens may be approximated very accurately by a laterally sy
 mmetrical gaussian function [1]. However it is true statement for the spac
 ial fields whose are near to a focus of the lens only. We carried out the 
 research to clarify a specifics of the lateral spacial distribution of the
  intensity of x-ray radiation around more spacious areas (placed more farl
 y from lens' focus along axial directions). As the result we found that in
  many cases a range of characteristical features of nonstandard behavior f
 or the spread function are exist. They may be asymmetrical behavior of gau
 ssian peak (most frequently)\, superposition of two peaks (whose are respe
 ctively big and small)\, strong nongauss behavior\, etc.\n	We consider for
  all these effects to be explained fully by a nonaccuracy adjustment of an
 gles and position of the polycapillary lens because of a limited precision
  of applied piesomechanics. Herewith most acceptable of the quality of the
  adjustment of the lens refers to cases of asymmetrical behavior of gaussi
 an peak of the spread function of the lens. In the frame of this research 
 a range of series of scanning experiments for detecting the spread functio
 n of the x-ray lens was carried out. The numbers of these series and the e
 xperiments of each series were be about 10. (Each series corresponded to a
 n individual case of adjustment of the polycapillary lens\, whereas a sing
 le experiments in each series referred to an individual case of spacial po
 sition of interesting field of spread function along the axial direction.)
 \n	We selected the range of the cases of the detected spread functions in 
 order to be proceed by the quantitative analysis (approximation) those ref
 er to the cases of most good quality of lens' adjustment. After that a var
 ious of approximation models (asymmetrical gaussians\, extreme\, logistpk\
 , lorentz peaks [2]\, some our models) were tested by us. As the result it
  was shown that most good results refer to the cases of the extreme peaks 
 approximation model additionally modified by us.\nThe scanning experiments
  were carried out at Synchrotron and Terahertz Research (INP SB RAS\, Novo
 sibirsk) and the Kurchatov Complex of Synchrotron-Neutron Research (KISI\,
  Moscow) using a confocal X-ray microscope. The work was carried out in th
 e framework of the RFBR projects no. 19-05-50046. The work was partly done
  at the shared research center SSTRC on the basis of the VEPP-4-VEPP-2000 
 complex at BINP SB RAS\, using equipment supported by project RFMEFI62119X
 0022.\n[1] Mantouvalou\, W. Malzer\, and B. Kanngiesber\, “Quantificatio
 n for 3D Micro X-ray Fluorescence\,” Spectrochimica Acta. Pt. B 77\, 9
 –18 (2012).\n[2] http://www.originlab.com/pdfs/16_CurveFitting.pdf\n\nht
 tps://indico.inp.nsk.su/event/24/contributions/1849/
LOCATION:
URL:https://indico.inp.nsk.su/event/24/contributions/1849/
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