The Nanoscale Ordered MAterials Diffractometer NOMAD at the Spallation Neutron Source SNS
- ORNL
The Nanoscale Ordered Materials Diffractometer (NOMAD) is neutron time-of-flight diffractometer designed to determine pair dist ribution 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 $$\delta Q/Q \sim 0.8\%$$ FWHM (typical), and an achievable $$\delta Q/Q$$ of 0.24\% FWHM (best). The real space resolution is related to the maximum momentum transfer; A maximum momentum transfer of 50\AA$$^{-1}$$ can be achieved routinely and the maximum momentum transfer given by the detector configuration and the incident neutron spectrum is 125 \AA$$^{-1}$$. 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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1048153
- Journal Information:
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 287
- Country of Publication:
- United States
- Language:
- English
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