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|Title: ||The multipurpose time-of-flight neutron reflectometer "Platypus" at Australia's OPAL reactor|
|Authors: ||James, M|
|Keywords: ||Cold neutrons|
|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.|
|Appears in Collections:||Journal Articles|
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