title: Note: Detector collimators for the nanoscale ordered materials diffractometer instrument at the Spallation Neutron Source.
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 Å(-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 Å(-1), the improvement factors were 1.8 and 2.7. Secondary scattering as measured at Q ∼ 9.5 Å(-1) was significantly decreased when the collimators were installed.
authors.affiliation: Materials Development, Inc., Arlington Heights, Illinois 60004, USA.
authors.forename: A
authors.initials: A
authors.lastname: Tamalonis
authors.affiliation: Materials Development, Inc., Arlington Heights, Illinois 60004, USA.
authors.forename: J K R
authors.initials: JK
authors.lastname: Weber
authors.affiliation: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA.
authors.forename: J C
authors.initials: JC
authors.lastname: Neuefeind
authors.affiliation: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA.
authors.forename: J
authors.initials: J
authors.lastname: Carruth
authors.affiliation: Materials Development, Inc., Arlington Heights, Illinois 60004, USA.
authors.forename: L B
authors.initials: LB
authors.lastname: Skinner
authors.affiliation: Materials Development, Inc., Arlington Heights, Illinois 60004, USA.
authors.forename: O L G
authors.initials: OL
authors.lastname: Alderman
authors.affiliation: Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: C J
authors.initials: CJ
authors.lastname: Benmore