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Implementation of cross correlation for energy discrimination on the time‐of‐flight spectrometer CORELLI
Author(s) -
Ye Feng,
Liu Yaohua,
Whitfield Ross,
Osborn Ray,
Rosenkranz Stephan
Publication year - 2018
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/s160057671800403x
Subject(s) - chopper , spectrometer , optics , reciprocal lattice , scattering , elastic scattering , physics , neutron scattering , diffraction , quantum mechanics , voltage
The CORELLI instrument at Oak Ridge National Laboratory is a statistical chopper spectrometer designed and optimized to probe complex disorder in crystalline materials through diffuse scattering experiments. On CORELLI, the high efficiency of white‐beam Laue diffraction combined with elastic discrimination have enabled an unprecedented data collection rate to obtain both the total and the elastic‐only scattering over a large volume of reciprocal space from a single measurement. To achieve this, CORELLI is equipped with a statistical chopper to modulate the incoming neutron beam quasi‐randomly, and then the cross‐correlation method is applied to reconstruct the elastic component from the scattering data. Details of the implementation of the cross‐correlation method on CORELLI are given and its performance is discussed.