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Title: Note: Detector collimators for the nanoscale ordered materials diffractometer instrument at the Spallation Neutron Source

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{sup −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{sup −1}, the improvement factors were 1.8 and 2.7. Secondary scattering as measured at Q ∼ 9.5 Å{sup −1} was significantly decreased when the collimators were installed.
Authors:
 [1] ; ;  [1] ;  [2] ; ;  [3] ;  [1] ;  [2] ;  [2] ;  [4]
  1. Materials Development, Inc., Arlington Heights, Illinois 60004 (United States)
  2. (United States)
  3. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830 (United States)
  4. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
22482800
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BORATES; COLLIMATORS; DESIGN; DETECTION; MATERIALS; NANOSTRUCTURES; NEUTRON SOURCES; NEUTRONS; POLYETHYLENES; SCATTERING; SIGNALS; SPALLATION