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

Journal Article · Tue Sep 01 00:00:00 EDT 2015 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4930279· OSTI ID:1325246

Tamalonis, A. ^[1]; Weber, J. K. R.  ^[2]; Neuefeind, J. C. ^[3]; Carruth, J.  ^[3]; Skinner, L. B.  ^[4]; Alderman, O. L. G. ^[2]; Benmore, C. J. ^[5]

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1. Materials Development, Inc., Arlington Heights, Illinois 60004, USA
2. Materials Development, Inc., Arlington Heights, Illinois 60004, USA; Argonne National Laboratory, Argonne, Illinois 60439, USA
3. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
4. Materials Development, Inc., Arlington Heights, Illinois 60004, USA; Argonne National Laboratory, Argonne, Illinois 60439, USA; Stony Brook University, Stony Brook, New York 11794, USA
5. Argonne National Laboratory, Argonne, Illinois 60439, USA

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.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1325246
• Journal Information: Review of Scientific Instruments, Vol. 86, Issue 9; ISSN 0034-6748
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

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