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Implementation of cross correlation for energy discrimination on the time-of-flight spectrometer CORELLI...

by Feng Ye, Yaohua Liu, Ross E Whitfield, Raymond Osborn, Stephan Rosenkranz
Publication Type
Journal Name
Journal of Applied Crystallography
Publication Date
Page Numbers
315 to 322

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.