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

Journal Article · Wed Sep 09 00:00:00 EDT 2015 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4930279· OSTI ID:1261471

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, IL (United States)
2. Materials Development, Inc., Arlington Heights, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
4. Materials Development, Inc., Arlington Heights, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Stony Brook Univ., NY (United States)
5. Argonne National Lab. (ANL), Argonne, IL (United States)

We constructed and tested five neutron collimator designs using 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. Moreover, 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 similar to 9.5 Å^-1 was significantly decreased when the collimators were installed.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC05-00OR22725; SC0004684
• OSTI ID: 1261471
• 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

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY