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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/3673

Title: The multipurpose time-of-flight neutron reflectometer "Platypus" at Australia's OPAL reactor
Authors: James, M
Nelson, A
Holt, SA
Saerbeck, T
Hamilton, WA
Klose, F
Keywords: Cold neutrons
Thin films
Reflectivity
Spectrometer
Membranes
OPAL Reactor
Issue Date: 11-Mar-2011
Publisher: ELSEVIER SCIENCE BV
Citation: James, M., Nelson, A., Holt, S.A., Saerbeck, T., Hamilton, W.A., Klose, F. (2011). The multipurpose time-of-flight neutron reflectometer "Platypus" at Australia's OPAL reactor. Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 632(1), 112-123
Abstract: In this manuscript we describe the major components of the Platypus time-of-flight neutron reflectometer at the 20 MW OPAL reactor in Sydney, Australia. Platypus is a multipurpose spectrometer for the characterisation of solid thin films, materials adsorbed at the solid-liquid interface and free-liquid surfaces. It also has the capacity to study magnetic thin films using spin-polarised neutrons. Platypus utilises a white neutron beam (lambda=2-20 angstrom) that is pulsed using boron-coated disc chopper pairs; thus providing the capacity to tailor the wavelength resolution of the pulses to suit the system under investigation. Supermirror optical components are used to focus, deflect or spin-polarise the broad bandwidth neutron beams, and typical incident spectra are presented for each configuration. A series of neutron reflectivity datasets are presented, indicating the quality and flexibility of this spectrometer. Minimum reflectivity values of <10(-7) are observed: while maximum thickness values of 325 nm have been measured for single-component films and 483 nm for a multilayer system. Off-specular measurements have also been made to investigate in-plane features as opposed to those normal to the sample surface. Finally, the first published studies conducted using the Platypus time-of-flight neutron reflectometer are presented. (C) 2011 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.nima.2010.12.075
http://apo.ansto.gov.au/dspace/handle/10238/3673
ISSN: 0168-9002
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