Browsing by Author "Noakes, TJ"
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- ItemECHIDNA - getting OPAL’s high resolution powder diffractometer into operation(Australian Institute of Physics, 2006-12-05) Liss, KD; Hunter, BA; Hagen, ME; Noakes, TJA 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)
- ItemEchidna—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, SJA 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
- ItemEchidna—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, SJA 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
- ItemHigh intensity and high resolution neutron powder diffraction at the replacement research reactor(Australian Institute of Physics, 2004-02-04) Hagen, ME; Hunter, BA; Noakes, TJNeutron 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.
- ItemPelican - a time of flight cold neutron polarization analysis spectrometer at OPAL(The Physical Society of Japan, 2013-01-01) Yu, DH; Mole, RA; Noakes, TJ; Kennedy, SJ; Robinson, RAPelican, a direct-geometry multi-purpose cold-neutron spectrometer, combines state-of-the-art monochromators and Fermi chopper systems to perform inelastic and quasi-elastic neutron scattering on a variety of materials (powder, polycrystal, single crystal, glass and liquid), covering fields of physics, chemistry and biology. The provision of cryogenic vacuum from sample to detector decreases background to a minimum level. A polarized incident beam is realized by supermirror polarizer and polarization analysis will be achieved by He-3 polarization filter. The instrument is designed to accommodate various sample environments including high magnetic fields, and low and high temperatures. Pelican is the first neutron spectrometer having a moveable high-vacuum Aluminium chamber and a full polarization analysis system. © 2013, Physical Society of Japan.
- ItemQuokka: 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, JA 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
- ItemQuokka: the small-angle neutron scattering instrument at OPAL(Australian Institute of Physics, 2006-12-05) Noakes, TJ; Christoforidis, J; Schulz, JC; Hamilton, WA; Gilbert, EPA small-angle neutron scattering (SANS) instrument[1] is being designed as part of the initial instrument suite for the new 20-MW Australian Reactor, OPAL. This instrument is designed to study structure on 1-100nm length scales on the wide variety of materials of scientific and technological importance for which neutron scattering has some considerable advantages over its x-ray counterpart, in particular (i) systems for which isotopic (H/D) contrast may be employed to highlight ordering, such as self-assembled polymer, surfactant and bio-molecule mesophases, and (ii) systems which scatter the neutron due to its magnetic moment, such as flux line penetration arrays in type II superconductors. The OPAL SANS instrument, receiving neutrons from a large liquid-D2 cold source, will be in the spirit of the world’s best facilities and will greatly build upon the Australian Nuclear Science and Technology Organisation’s existing expertise and facilities. Scheduled to begin operation in 2007, it will provide Australian and international researchers with opportunities to access state-of-the-art SANS instrumentation. [1] E.P. Gilbert, J.C. Schulz and Terry J. Noakes, Physica B, (2006) in press
- Item‘Quokka’—the small-angle neutron scattering instrument at OPAL(Elsevier B. V., 2006-11-15) Gilbert, EP; Schulz, JC; Noakes, TJA small-angle neutron scattering instrument (Quokka) is being built as part of the initial instrument suite for the 20 MW Australian Research Reactor, OPAL. The 40 m long instrument will be located at the end of a curved supermirror neutron guide and will receive neutrons from a large liquid-D2 cold source. The instrument will have incident beam polarisation and focusing optics using MgF2 lenses and gravity-correcting prisms in the collimation system. The secondary flight path includes a 1 m2 area detector with high-speed data acquisition electronics with provision for the inclusion of polarisation analysis at a later date. © 2006 Elsevier B.V.
- ItemWOMBAT: the high intensity powder diffractometer at the OPAL Reactor(The Bragg Institute, Australian Nuclear Science and Technology Organisation, 2005-11-27) Studer, AJ; Hagen, ME; Noakes, TJThe WOMBAT powder diffractometer will be located on the TG1 thermal guide at the OPAL reactor. A variable vertically focusing monochromator will provide a flux of up to ∼ 108 n.s-1.cm-2 at the sample position. A compact curved 2D position sensitive detector will allow simultaneous acquisition of 120 degrees in 2θ, with ∼ 106s-1 count rate capability and time resolution down to the microsecond level. WOMBAT is designed for experiments requiring rapid real time acquisition (time resolved environmental or kinetics experiments) or very good signal to noise (experiments with difficult sample environments or small sample volumes). © The Authors
- ItemWombat: the high-intensity powder diffractometer at the OPAL reactor(Elsevier B. V., 2006-11-15) Studer, AJ; Hagen, ME; Noakes, TJThe Wombat powder diffractometer will be located on the TG1 thermal guide at the OPAL reactor. A variable vertically focusing monochromator will provide a flux of up to ≈108 ns−1 cm−2 at the sample position. A compact curved 2D position sensitive detector will allow simultaneous acquisition of 120 ° in 2θ, with ≈106 s−1 count rate capability and time resolution down to the microsecond level. Wombat is designed for experiments requiring rapid real time acquisition (time-resolved environmental or kinetics experiments) or very good signal to noise (experiments with difficult sample environments or small sample volumes). Crown Copyright © 2006 Published by Elsevier B.V.