Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1682231 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2012 | 8 Pages |
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/Qâ¼0.8% 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 Ã
â1 can be obtained routinely and the maximum momentum transfer given by the detector configuration and the incident neutron spectrum is 125Â Ã
-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.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
Jörg Neuefeind, Mikhail Feygenson, John Carruth, Ron Hoffmann, Kenneth K. Chipley,