Ye Feng, Liu Yaohua, Whitfield Ross, Osborn Ray, Rosenkranz Stephan
Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA.
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA.
J Appl Crystallogr. 2018 Mar 26;51(Pt 2):315-322. doi: 10.1107/S160057671800403X. eCollection 2018 Apr 1.
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.
橡树岭国家实验室的CORELLI仪器是一种统计斩波器光谱仪，其设计和优化目的是通过漫散射实验探测晶体材料中的复杂无序性。在CORELLI上，白光束劳厄衍射的高效率与弹性鉴别相结合，使得在单次测量中能以前所未有的数据采集速率在大体积倒易空间中获取总散射和仅弹性散射。为实现这一点，CORELLI配备了一个统计斩波器来准随机调制入射中子束，然后应用互相关方法从散射数据中重建弹性分量。文中给出了CORELLI上互相关方法的实施细节并讨论了其性能。
