Novel engineering materials diffractometer fabricated at the China Spallation Neutron Source

Abstract

A new engineering materials diffractometer (EMD) was designed at the China Spallation Neutron Source (CSNS). Its neutron source power is 100 kW. The EMD will focus on strain and deformation determination research in engineering materials. It is scheduled to be commissioned in the middle of 2022. The design concepts, Monte Carlo simulations, and main components are introduced here. It is flexible for use in high-intensity and high-resolution applications. The high Δd/d resolution of 0.26% at a 90° scattering angle was achieved with a flux of 4.7 × 106 n/(cm 2⋅s) at the sample. A higher flux of 1.5 × 107 n/(cm 2⋅s) could be achieved with a resolution of 0.51%. This new EMD will support extensive applications and research on modern engineering materials.