Publication Type
Journal
Journal Name
Review of Scientific Instruments
Publication Date
Page Number
096105
Volume
86
Issue
9
Abstract
Five neutron collimator designs were constructed and tested at the nanoscale ordered materials diffractometer (NOMAD) instrument. Collimators were made from High Density PolyEthylene (HDPE) or 5% borated HDPE. In all cases, collimators improved the signal to background ratio and reduced detection of secondary scattering. In the Q-range 10-20 (angstrom)-(1), signal to background ratio improved by factors of approximately 1.6 and 2.0 for 50 and 100 mm deep collimators, respectively. In the Q-range 40-50 angstrom(-1), the improvement factors were 1.8 and 2.7. Secondary scattering as measured at Q similar to 9.5 angstrom(-1) was significantly decreased when the collimators were installed. (C) 2015 AIP Publishing LLC.
