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

被引：330

作者：

Neuefeind, Joerg ^{[1
]}

Feygenson, Mikhail ^{[1
]}

Carruth, John ^{[1
]}

Hoffmann, Ron ^{[1
]}

Chipley, Kenneth K. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Neutron Scattering Sci Directorate, Oak Ridge, TN 37831 USA

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2012年 / 287卷

关键词：

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

D O I：

10.1016/j.nimb.2012.05.037

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

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 delta Q/Q similar to 0.8% FWHM (typical), and a possible delta Q/Q of 0.24% FWHM (best). The real space resolution is related to the maximum momentum transfer; a maximum momentum transfer of 50 angstrom(-1) can be obtained routinely and the maximum momentum transfer given by the detector configuration and the incident neutron spectrum is 125 angstrom(-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. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：68 / 75

页数：8

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