Abstract
The practical problems associated with beam collimation and specimen manipulation at a pulsed neutron source are identical to those on a steady state source. However extra constraints result from the limited space available and from the time of flight analysis of the diffracted neutrons. A manipulation and collimation system (MACS) has been designed for the neutron powder diffractometer (NPD) at the Manuel Lujan Jr. Neutron Scattering Centre (LANSCE). It provides specimen motion and aperture positioning with accuracies of better than 0 1mm and is constructed as a rigid unit. For flat sided specimens sampling volumes less than 30mm3 have been obtained demonstrating the viability of making spatially resolved strain measurements at a pulsed neutron source.
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