Application of electronic time focusing at the engineering materials diffractometer in the China spallation neutron source

The Engineering Materials Diffractometer (EMD) is a new and critical addition to the instrument suite of the China Spallation Neutron Source (CSNS). It will support extensive research activities and applications on modern engineering materials. Based on the large multielement detector array, the electronic time focusing method has been successfully applied to deal with the raw neutron data and the constants C_i, corresponding to each single pixel in the detector array, have been calculated using the relation between the time of flight of the Bragg peaks in standard Si sample and their particular d-spacings. The instrument resolution in the mode best suited for strain measurements (∼0.35%) is interpreted and verified as a function of d-spacing via Si and La¹¹B₆ standard samples. The results are found to be consistent with the McStas simulations of the instrument physical design.