The Nanoscale Ordered MAterials Diffractometer NOMAD at the Spallation Neutron Source SNS

Jörg Neuefeind, Mikhail Feygenson, John Carruth, Ron Hoffmann, Kenneth K. Chipley

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322 Scopus citations

Abstract

The Nanoscale Ordered MAterials Diffractometer (NOMAD) is neutron time-of-flight diffractometer designed to determine pair distribution functions of a wide range of materials ranging from short range ordered liquids to long range ordered crystals. Due to a large neutron flux provided by the Spallation Neutron Source SNS and a large detector coverage neutron count-rates exceed comparable instruments by one to two orders of magnitude. This is achieved while maintaining a relatively high momentum transfer resolution of a δQ/Q∼0.8% FWHM (typical), and a possible δQ/Qof0.24% FWHM (best). The real space resolution is related to the maximum momentum transfer; a maximum momentum transfer of 50 -1 can be obtained routinely and the maximum momentum transfer given by the detector configuration and the incident neutron spectrum is 125 -1. High stability of the source and the detector allow small contrast isotope experiments to be performed. A detailed description of the instrument is given and the results of experiments with standard samples are discussed.

Original languageEnglish
Pages (from-to)68-75
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume287
DOIs
StatePublished - Sep 15 2012

Funding

We thank Chris Benmore for providing the sample that served as a standard for the GLAD diffractometer for long years. This research at Oak Ridge National Laboratory’s Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy .

FundersFunder number
Scientific User Facilities Division
U.S. Department of Energy
Basic Energy Sciences
Oak Ridge National Laboratory

    Keywords

    • Neutron diffractometer
    • Pair-distribution function
    • Spallation Neutron Source

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