Plastically deformed beryllium blades for neutron monochromator construction

Abstract

Deformation of thin beryllium blades by plastic bending seems to be a promising way to construct a stacked neutron monochromator of high reflectivity. A 0.60° broad 11 20 reflection with a maximum reflectivity of 38% was reached with a 6 mm thick package of deformed blades at a neutron wavelength of 1.15 Å. Since the measured values are smaller than the theoretical values, primary extinction is not negligible. This can be explained by the deformation mode applied. An attempt to solve this problem is proposed.