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Resolution of time‐of‐flight small‐angle neutron diffractometers
Author(s) -
Hjelm R. P.
Publication year - 1987
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889887086679
Subject(s) - time of flight , neutron , optics , resolution (logic) , physics , angular resolution (graph drawing) , neutron scattering , isotropy , small angle neutron scattering , neutron time of flight scattering , computational physics , detector , image resolution , data acquisition , neutron detection , scattering , nuclear physics , computer science , mathematics , combinatorics , artificial intelligence , operating system
A simple method of calculating the resolution of small‐angle neutron data from diffractometers which use time‐of‐flight techniques has been derived in terms of the variances of the time and spatial channels of the measurement. The method is used to calculate the resolution in scattering‐vector space of scattering intensity from a simulated isotropic scatterer on the small‐angle neutron diffractometer at the Intense Pulsed Neutron Source at Argonne National Laboratory. The effects of the various instrumental geometries, time‐of‐flight measurement strategies and data reduction methods that can be chosen by the experimenter are considered. It is found that the best resolution is obtained with weighted constant Δt/t time‐of‐flight data acquisition schemes, with the detector placed in the beam in such a way that the highest possible angular range is accessed.