December 2012

Journal

The 40m General Purpose Small-Angle Neutron Scattering Instrument at Oak Ridge National Laboratory

By:
Wignall, George D; Bailey, Katherine M; Buchanan, Michelle V; Butler, Paul D; Heller, William T; Littrell, Kenneth C; Lynn, Gary W; Melnichenko, Yuri B; Myles, Dean A; Urban, Volker S
Journal Name:
Journal of Applied Crystallography
Page Number:
990-998
Volume:
45
Issue Number:
5
Publication Date:
December 2012
View DOI Listing:
https://doi.org/10.1107/S0021889812027057

Abstract

A high-flux, 40m long small-angle neutron scattering (SANS) instrument has been constructed at Oak Ridge National Laboratory (ORNL). The facility utilizes a mechanical velocity selector, pinhole collimation and a high count-rate (> 105 Hz), large-area (1m2) two-dimensional position-sensitive detector. The incident wavelength (λ), resolution (Δλ/λ), incident collimation and sample-detector distance are independently variable under computer control. The detector can translate 45cm off axis to increase the overall Q-range (< 0.001 < Q = 4πλ-1sin θ < 1 Å-1), where 2θ is the angle of scatter. The design and characteristics of this instrument are described along with examples of scattering data to illustrate the performance.