Wavelength calibration in conventional SANS setup with a mechanical velocity selector

L. Almásy, A. Len, M. Markó, E. Rétfalvi

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1 Citation (Scopus)

Abstract

In the conventional setup of a small-angle neutron scattering instrument a nearly monochromatic neutron beam is formed by means of a mechanical velocity selector. We studied the influence of the wavelength distribution in the incident beam on the wavelength of the neutrons reaching the sample. The assumption that the wavelength spectrum behind the selector equals to the product of the incident spectrum of the thermalized neutrons and the transmission window of the selector predicts satisfactorily the wavelength measured at sample position. An approximate relation is given between the effective wavelength and the selector rotation speed. The described method of wavelength calibration can improve the precision of size determination in SANS experiment.

Original languageEnglish
Pages (from-to)211-216
Number of pages6
JournalZeitschrift fur Kristallographie, Supplement
Volume1
Issue number23
Publication statusPublished - Dec 1 2006

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Keywords

  • Silver behenate
  • Small-angle neutron scattering
  • Velocity selector
  • Wavelength calibration

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

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