Design for a conventional high-resolution neutron powder diffractometer

The design considerations for a conventional neutron powder diffractometer are reconsidered. It is found that the resolution can be improved to the limits imposed by the powder particle size, while the effective intensity can at the same time be increased by using multiple counters with the correct combination of soller divergences, monochromator mosaic spread, and take-off angle. With the profile technique for data analysis, this high resolution diffractometer should permit the refinement of nuclear and magnetic structures having unit cells of up to 3500A3 volume. (Auth.)