The 40 m general purpose small-angle neutron scattering instrument at Oak Ridge National Laboratory

George D. Wignall; Kenneth C. Littrell; William T. Heller; Yuri B. Melnichenko; Kathy M. Bailey; Gary W. Lynn; Dean A. Myles; Volker S. Urban; Michelle V. Buchanan; Douglas L. Selby; Paul D. Butler

doi:10.1107/S0021889812027057

The 40 m general purpose small-angle neutron scattering instrument at Oak Ridge National Laboratory

George D. Wignall, Kenneth C. Littrell, William T. Heller, Yuri B. Melnichenko, Kathy M. Bailey, Gary W. Lynn, Dean A. Myles, Volker S. Urban, Michelle V. Buchanan, Douglas L. Selby, Paul D. Butler

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92 Scopus citations

Abstract

A series of upgrades have been undertaken at the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory, including the installation of a supercritical hydrogen moderator (T ≃ 20 K), which has boosted the flux of long-wavelength neutrons by over two orders of magnitude. In order to take advantage of the new capabilities, a 40 m-long small-angle neutron scattering (SANS) instrument has been constructed, which utilizes a mechanical velocity selector, pinhole collimation and a high-count-rate (>10⁵ Hz) large-area (1 m²) two-dimensional position-sensitive detector. The incident wavelength (λ), resolution (Δλ/λ), incident collimation and sample-to-detector distance are independently variable under computer control. The detector can be moved up to 45 cm off-axis to increase the overall Q range [<0.001 < Q = (4π/λ)sinθ < 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.

Original language	English
Pages (from-to)	990-998
Number of pages	9
Journal	Journal of Applied Crystallography
Volume	45
Issue number	5
DOIs	https://doi.org/10.1107/S0021889812027057
State	Published - Oct 2012

Keywords

HFIR
beamline upgrades
small-angle neutron scattering
wide Q range

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Wignall, G. D., Littrell, K. C., Heller, W. T., Melnichenko, Y. B., Bailey, K. M., Lynn, G. W., Myles, D. A., Urban, V. S., Buchanan, M. V., Selby, D. L., & Butler, P. D. (2012). The 40 m general purpose small-angle neutron scattering instrument at Oak Ridge National Laboratory. Journal of Applied Crystallography, 45(5), 990-998. https://doi.org/10.1107/S0021889812027057

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abstract = "A series of upgrades have been undertaken at the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory, including the installation of a supercritical hydrogen moderator (T ≃ 20 K), which has boosted the flux of long-wavelength neutrons by over two orders of magnitude. In order to take advantage of the new capabilities, a 40 m-long small-angle neutron scattering (SANS) instrument has been constructed, which utilizes a mechanical velocity selector, pinhole collimation and a high-count-rate (>105 Hz) large-area (1 m2) two-dimensional position-sensitive detector. The incident wavelength (λ), resolution (Δλ/λ), incident collimation and sample-to-detector distance are independently variable under computer control. The detector can be moved up to 45 cm off-axis to increase the overall Q range [<0.001 < Q = (4π/λ)sinθ < 1 {\AA}-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.",

keywords = "HFIR, beamline upgrades, small-angle neutron scattering, wide Q range",

author = "Wignall, {George D.} and Littrell, {Kenneth C.} and Heller, {William T.} and Melnichenko, {Yuri B.} and Bailey, {Kathy M.} and Lynn, {Gary W.} and Myles, {Dean A.} and Urban, {Volker S.} and Buchanan, {Michelle V.} and Selby, {Douglas L.} and Butler, {Paul D.}",

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The 40 m general purpose small-angle neutron scattering instrument at Oak Ridge National Laboratory

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