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Title: EMU, the cold-neutron backscattering spectrometer at the Bragg Institute, ANSTO
Authors: de Souza, NR
Klapproth, A
Iles, GN
Keywords: ANSTO
Cold neutrons
Neutron diffraction
OPAL Reactor
Pyrolytic carbon
Silicon ions
Issue Date: 3-Feb-2015
Publisher: Australian Institute of Physics
Citation: de Souza, N., Klapproth, A., & Iles, G. N. (2015). EMU, the cold-neutron backscattering spectrometer at the Bragg Institute, ANSTO. Paper presented at the 39th Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, NSW, 3 February 2015 - 6 February 2015, (pp. 70). Retrieved from:
Abstract: The Bragg Institute is currently in the final installation stage of a cold-neutron backscattering spectrometer in the ANSTO OPAL research reactor neutron guide hall. This spectrometer, called EMU, is based on Si (111) crystal backscattering and extracts neutrons from a cold neutron guide via a double HOPG (002) crystal premonochromator setup. Backscattering occurs through implementation of spherical focusing between the Si (111) crystal monochromator and analyser arrays, aiming to deliver a spectrometer FWHM energy resolution in the order of 1.2 μeV. EMU also features a 7-metre long focusing guide located between the two premonochromators, a so-called graphite chopper alternating beam delivery to the backscattering crystal monochromator and then into the secondary spectrometer, and a linear Doppler drive modulating incident neutron energies over ± 31 μeV. Scattered, analysed neutrons are counted in 3He LPSD arrays. EMU is provisioned for future extensions of its dynamic range via higher-resolution, undeformed Si (111) crystal analyser arrays, and variable HOPG (002) crystal premonochromator reflection angles. Access to the EMU spectrometer will be via beam-time requests to the OPAL neutron-beam user facility. EMU is ideally suited for measuring relaxation times from a few 10 ps to over 1 ns, for momentum transfers up to 2 Å-1, and readily from cryogenic temperatures up to 700 K.
ISBN: 978-0-646-96433-1
Appears in Collections:Conference Publications

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