Browsing by Author "Hunter, BA"

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    ECHIDNA - getting OPAL’s high resolution powder diffractometer into operation
    (Australian Institute of Physics, 2006-12-05) Liss, KD; Hunter, BA; Hagen, ME; Noakes, TJ
    A new powder diffractometer aiming for high angular and thus high reciprocal space resolution is being constructed within the Neutron Beam Instrumentation Project at the upcoming Australian Neutron Source OPAL near Sydney. The expected neutron flux at the sample can be expected more than 107 n/s. With an array of 128 position sensitive detectors, each equipped with a 30 cm high Söller collimator of 5 arc min acceptance this instrument will range below the highest performances of its kind. In addition to classical applications in powder diffraction, the quasi two-dimensional detector will be used for rapid texture measurements where high separation of peaks is necessary. Even single crystal reciprocal space mapping will be envisaged [1]. The poster compiles an overview of the installation and commissioning of the new instrument. Neutrons are planned to be available from August 2006 and first experimental data be available for the conference. [1] K.-D. Liss, B. Hunter, M. Hagen, T. Noakes, S. Kennedy: "ECHIDNA - The new high-resolution powder diffractometer being built at OPAL", Physica B, accepted (2006)
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    Echidna—the new high-resolution powder diffractometer being built at OPAL
    (Elsevier B. V., 2006-11-15) Liss, KD; Hunter, BA; Hagen, ME; Noakes, TJ; Kennedy, SJ
    A new powder diffractometer aiming for high angular, and thus high reciprocal space, resolution is being constructed within the Neutron Beam Instrumentation Project at the upcoming Australian Neutron Source OPAL, near Sydney. The neutron flux at the sample can be expected to be up to 107 n/cm2/s. With an array of 128 position sensitive detectors, each equipped with a 30 cm high Söller collimator of 5 arc min acceptance this instrument will have one of the highest performances of its kind. In addition to classical applications in powder diffraction, the quasi two-dimensional detector will be used for rapid texture measurements, where high separation of peaks is necessary. Even single crystal reciprocal space mapping is envisaged. The article compiles an overview of the design, status of the project and potential research activities. Crown Copyright © 2006 Published by Elsevier B.V
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    Echidna—the new high-resolution powder diffractometer being built at OPAL
    (The Bragg Institute, Australian Nuclear Science and Technology Organisation, 2005-11-27) Liss, KD; Hunter, BA; Hagen, ME; Noakes, TJ; Kennedy, SJ
    A new powder diffractometer, named Echidna, aiming for high angular and thus high reciprocal space resolution is being constructed within the Neutron Beam Instrumentation Project at the upcoming Australian Neutron Source OPAL near Sydney. The neutron flux at the sample can be expected to be more than 107 n/s. With an array of 128 position sensitive detectors, each equipped with a 30 cm high Soeller collimator of 5 arc min acceptance this instrument will have one of the highest performances of its kind. In addition to classical applications in powder diffraction, the quasi two-dimensional detector will be used for rapid texture measurements where high separation of peaks is necessary. Even single crystal reciprocal space mapping will be envisaged. The poster compiles an overview of the design, status of the project and potential research to be achieved. © The Authors
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    High intensity and high resolution neutron powder diffraction at the replacement research reactor
    (Australian Institute of Physics, 2004-02-04) Hagen, ME; Hunter, BA; Noakes, TJ
    Neutron powder diffraction is an established technique for studying the structures of crystalline materials. In any diffraction experiment the two most basic quantities which characterise the quality of the measured spectra are resolution and intensity. High-resolution measurements are used to determine precise and intricate details of the crystal structure, while high intensity measurements are used to characterise changes driven in real time by in-situ measurements. In both cases recent developments in the instrumentation have focussed on the use of position sensitive and area detectors to increase the effective count rate in high resolution and high intensity measurements respectively. We will describe the characteristics of the High Intensity Powder Diffractometer (Wombat) and the High Resolution Powder Diffractometer (Echidna), which are currently under construction at the replacement research reactor, ANSTO and which will be available to the Australian scientific community in 2006.
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    Multiple-wavelength powder diffraction using imaging plates at the Australian National Beamline
    (International Union of Crystallography, 1997-08-04) Cookson, DJ; Hunter, BA; Kennedy, SJ; Garrett, RF
    The Australian powder diffractometer at the Photon Factory is capable of recording multiple powder-diffraction scans in less than 5 min per pattern using imaging plates in Debye–Scherrer geometry. This, coupled with incrementing the X-ray beam energy in suitably small steps (down to ∼2 eV) between exposures, allows fast collection of anomalous diffraction data. Data collected from a copper oxide-based superconductor at energies near the Cu K-absorption edge are presented, along with an account of the technique used to extract multiple-exposure powder-diffraction data from imaging plates. © International Union of Crystallography