Highly collimating neutron optical devices

Two Soller type highly collimating neutron optical devices with a length of 200 mm are presented. They provide a triangular shaped beam divergence distribution with a FWHM of about 0.11 degrees (2 mrad) and a peak transmission of up to 80% for neutrons with a wavelength gimel(0) of 5 angstrom. This corresponds to an improvement of more than a factor three compared to state of the art collimators. Measurements are presented which demonstrate the usefulness of these devices also for neutron radiography. (C) 2009 Elsevier B.V. All rights reserved.