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The name DREAM stands for Diffraction, Resolved by Energy and Angle Measurements. The energy or wavelength dependence is crucial for high-resolution neutron time-of-flight powder diffraction, where dedicated backscattering detectors are used at today’s pulsed spallation sources. A large 2D detector yields information on both the diffraction angle and on the texture angle along the Debye-Scherrer cones. The “E” also has a twofold meaning, as the new detector is a volume detector, which promises to retrieve information about the energy transfer upon scattering, from the wavelength-energy characteristics of the absorption profiles, using the depth of the detector volume. The “R” and “M” can alternatively stand for refinement and modeling, in which the variables “E” and “A” are fitted in 2D refinements to the varying resolution and exploit, optimizing the combination of high resolution and high intensity. Consequently, detectors are no longer “grouped” into complex bank arrangements.
