EMU, the cold-neutron backscattering spectrometer at the Bragg Institute, ANSTO

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dc.contributor.authorde Souza, NRen_AU
dc.contributor.authorKlapproth, Aen_AU
dc.contributor.authorIles, GNen_AU
dc.date.accessioned2021-08-13T02:19:54Zen_AU
dc.date.available2021-08-13T02:19:54Zen_AU
dc.date.issued2015-02-03en_AU
dc.date.statistics2021-08-12en_AU
dc.description.abstractThe 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.en_AU
dc.identifier.citationde 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: https://physics.org.au/wp-content/uploads/cmm/2015/Wagga2015_10_Handbook.pdfen_AU
dc.identifier.conferenceenddate6 February 2015en_AU
dc.identifier.conferencename39th Annual Condensed Matter and Materials Meetingen_AU
dc.identifier.conferenceplaceWagga Wagga, NSWen_AU
dc.identifier.conferencestartdate3 February 2015en_AU
dc.identifier.isbn978-0-646-96433-1en_AU
dc.identifier.pagination70en_AU
dc.identifier.urihttps://physics.org.au/wp-content/uploads/cmm/2015/Wagga2015_10_Handbook.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11349en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Physicsen_AU
dc.subjectANSTOen_AU
dc.subjectAustraliaen_AU
dc.subjectBackscatteringen_AU
dc.subjectCold neutronsen_AU
dc.subjectCrystalsen_AU
dc.subjectGraphiteen_AU
dc.subjectInstallationen_AU
dc.subjectMonochromatorsen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectOPAL Reactoren_AU
dc.subjectPyrolytic carbonen_AU
dc.subjectSilicon ionsen_AU
dc.subjectSpectrometersen_AU
dc.subjectSpectroscopyen_AU
dc.titleEMU, the cold-neutron backscattering spectrometer at the Bragg Institute, ANSTOen_AU
dc.typeConference Abstracten_AU
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