Browsing by Author "Brûlé, A"

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    KOOKABURRA: the ultra-small-angle neutron scattering instrument at OPAL
    (Wiley-Blackwell, 2013-12-01) Rehm, C; Brûlé, A; Freund, AK; Kennedy, SJ
    The new double crystal ultra-small-angle neutron scattering instrument Kookaburra, currently under construction at the ANSTO OPAL reactor, will allow characterization of microstructures covering length scales in the range of 0.1 to 10 microm. Using the 002 and 004 reflections of a doubly curved mosaic highly oriented pyrolytic graphite premonochromator crystal at a fixed Bragg angle of 45degrees in conjunction with two pairs of Si(111) and Si(311) quintuple-reflection channel-cut crystals will allow operation of the instrument at two different wavelengths, thus optimally accommodating weakly and strongly scattering samples in one sample position. The versatility, the estimated neutron fluxes and the low background noise of Kookaburra suggest that this state-of-the-art instrument will have a major impact in the field of large-scale structure determination. © 2013, Wiley-Blackwell.
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    PLATYPUS - a time-of-flight neutron reflectometer at the OPAL Facility
    (The Bragg Institute, Australian Nuclear Science and Technology Organisation, 2005-11-27) James, M; Brûlé, A
    Neutron reflectometry is used to probe the structure of surfaces, thin-films or buried interfaces as well as processes occurring at surfaces and interfaces. Applications cover adsorbed surfactant layers, self-assembled monolayers, biological membranes, electrochemical and catalytic interfaces, polymer coatings and photosensitive films. The PLATYPUS neutron reflectometer has been recognised as one of the highest priority instruments to be constructed at the new 20MW OPAL research reactor at Lucas Heights. The instrument will be capable of collecting data from solid, liquid and magnetic samples using a broad wavelength band of polarised or non-polarised neutrons. Details of the design and construction of the PLATYPUS reflectometer will be given. © 2005 The Authors
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    PLATYPUS - the time-of-flight neutron reflectometer at Australia’s New 20 MW OPAL research reactor
    (Australian Institute of Physics, 2006-12-05) James, M; Nelson, A; Brûlé, A; Hamilton, WA
    Neutron reflectometry is used to probe the structure of surfaces, thin-films or buried interfaces as well as nanoscale processes occurring at them. Applications cover nanostructured magnetic thin films, electrochemical and catalytic interfaces, adsorbed surfactant layers, self-assembled monolayers, biological membranes, polymer coatings and photosensitive films. Contrast variation and selective deuteration of hydrogenous materials are important aspects of the neutron-based technique. Neutron reflectometry probes the structure of materials normal to the surface at depths of up to several thousand Å, with a depth resolution of a few Å. A time-of-flight neutron reflectometer (PLATYPUS) is under construction at Australia’s new 20 MW OPAL research reactor at Lucas Heights (due for completion in 2007). PLATYPUS has been designed to study nanoscale films on solid and free-liquid surfaces. Magnetic materials can be examined using a polarized beam option, while in-plane structures can be studied by off-specular scattering using a 2-dimensional helium-3 detector. Kinetic studies will also be possible due to a disc chopper system that offers the possibility of tailoring the resolution of the instrument to suit the lengthscales of interest. In this presentation we report the design, specifications and results of commissioning experiments of the PLATYPUS neutron reflectometer.
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    Platypus: a time-of-flight neutron reflectometer at Australia's new research reactor
    (Taylor & Francis, 2007-01-31) James, M; Nelson, A; Brûlé, A; Schulz, JC
    A time-of-flight neutron reflectometer is to be built at the new 20 MW research reactor (OPAL) in Sydney. The instrument will be positioned at the end of a curved supermirror neutron guide that will provide optimal transmission of cold neutrons (2–20 Å) while removing fast neutrons and high-energy γ-rays. The reflectometer will utilise a white neutron beam that will be pulsed using a series of boron coated disc choppers. Typically three angle settings will be required to collect a complete reflectivity profile (from Q z = 0.005–0.5 Å− 1). The new instrument will operate with a vertical scattering plane, making it suitable for both solid and “free-liquid” surfaces. The instrument will also be capable of producing a spin-polarized neutron beam making provision for polarized neutron reflectometry studies. Detection of the reflected neutrons will take place using a 2-dimensional 3He delay-line detector with high-speed data acquisition electronics. © 2022 Informa UK Limited
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    Polarization "down under": the polarized time-of-flight neutron reflectometer PLATYPUS
    (American Institute of Physics, 2012-08-01) Saerbeck, T; Klose, F; Le Brun, AP; Füzi, J; Brûlé, A; Nelson, A; Holt, SA; James, M
    This review presents the implementation and full characterization of the polarization equipment of the time-of-flightneutron reflectometer PLATYPUS at the Australian Nuclear Science and Technology Organisation (ANSTO). The functionality and efficiency of individual components are evaluated and found to maintain a high neutron beam polarization with a maximum of 99.3% through polarizing Fe/Si supermirrors. Neutron spin-flippers with efficiencies of 99.7% give full control over the incident and scattered neutron spin direction over the whole wavelength spectrum available in the instrument. The first scientific experiments illustrate data correction mechanisms for finite polarizations and reveal an extraordinarily high reproducibility for measuring magnetic thin film samples. The setup is now fully commissioned and available for users through the neutron beam proposal system of the Bragg Institute at ANSTO. © 2012, American Institute of Physics.
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    Quokka: the small-angle neutron scattering instrument at OPAL
    (The Bragg Institute, Australian Nuclear Science and Technology Organisation, 2005-11-27) Gilbert, EP; Noakes, TJ; Schulz, JC; Baxter, P; Darmann, F; Hauser, N; Abbeywick, P; Brûlé, A; Imamovic, E; Christoforidis, J
    A small-angle neutron scattering (SANS) instrument is being designed as part of the initial instrument suite for the 20-MW OPAL Reactor. The new instrument, receiving neutrons from a large liquid-D2 cold source, will be in the spirit of the worlds best facilities and will greatly build upon the Australian Nuclear Science and Technology Organisations existing expertise and facilities. Scheduled for completion in July 2006, it will provide Australian and international researchers with opportunities to access state-of-the-art SANS instrumentation. The details of the new SANS will be presented. © The Authors
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    Residual stress diffractometer KOWARI at the Australian research reactor OPAL: status of the project
    (Elsevier B. V., 2006-11-15) Brûlé, A; Kirstein, O
    Neutron scattering using diffraction techniques is now recognized as the most precise and reliable method of mapping sub-surface residual stresses in materials or even components, which are not only of academic but also of industrial-economic relevance. The great potential of neutrons in the field of residual stresses was recognized by ANSTO and its external Beam Instrument Advisory Group for the new research reactor OPAL. The recommendation was to build the dedicated strain scanner KOWARI among the first suite of instruments available to users. We give an update on the overall project and present the current status of the diffractometer. It is anticipated that the instrument will be commissioned in mid 2006 and available to users at the end of the OPAL project. Crown copyright © 2006 Published by Elsevier B.V
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    Residual stress diffractometer KOWARI at the Australian research reactor OPAL: status of the project
    (The Bragg Institute, Australian Nuclear Science and Technology Organisation, 2005-11-27) Brûlé, A; Kirstein, O
    Neutron scattering using diffraction techniques is now recognized as the most precise and reliable method of mapping sub-surface residual stresses in materials or even components, which are not only of academic but also of industrial-economic relevance. The great potential of neutrons in the field of residual stresses was recognized by ANSTO and its external Beam Instrument Advisory Group for the new research reactor OPAL. The recommendation was to build the dedicated strain scanner KOWARI among the first suite of instruments available to users. We give an update on the overall project and present the current status of the diffractometer. © The Authors