Toward a new lower limit for the minimum scattering vector on the very small angle neutron scattering spectrometer at Laboratoire Leon Brillouin
LECOMMANDOUX, Sebastien
Laboratoire de Chimie des polymères organiques [LCPO]
Team 3 LCPO : Polymer Self-Assembly & Life Sciences
< Réduire
Laboratoire de Chimie des polymères organiques [LCPO]
Team 3 LCPO : Polymer Self-Assembly & Life Sciences
Langue
en
Article de revue
Ce document a été publié dans
Journal of Applied Crystallography. 2008, vol. 41, n° Part 1, p. 161-166
International Union of Crystallography
Résumé en anglais
The main characteristics of the very small angle neutron scattering spectrometer (VSANS) under construction at the Laboratoire Leon Brillouin are a multibeam pinhole collimator converging onto an image plate detector. By ...Lire la suite >
The main characteristics of the very small angle neutron scattering spectrometer (VSANS) under construction at the Laboratoire Leon Brillouin are a multibeam pinhole collimator converging onto an image plate detector. By combining tiny collimation (diaphragms of around I or 2 mm in diameter) with the small pixel size of the detector (0.15 x 0.15 mm), very high resolution measurements can be achieved. The resolution function of the instrument contains a contribution from gravity, which is reduced by the intermediate masks of the collimator. Owing to the relatively short length of the VSANS instrument (around 14 m), this effect remains weak, in good agreement with the predictions. With a prototype multibeam collimator, an incident wavelength of 0.9 nm and the detector located at 6 m from the sample, it is possible to access q values as low as 4 x 10(-3) nm(-1) with very high q resolution. Promising preliminary experiments with high q resolution are reported, which open up new fields to the SANS technique.< Réduire
Mots clés en anglais
DIFFRACTOMETER
FOCUSING SANS
RESOLUTION
REFRACTIVE OPTICS
Origine
Importé de halUnités de recherche