A new neutron reflectometer at ANSTO

Full text: Neutron reflectometry is a rapidly expanding technique that is finding use in the study of interfacial regions of materials, as well as chemical processes occurring at interfaces. Examples of systems investigated using neutron reflectometry include thin-film multilayer systems (such as GMRs), Langmuir-Blodgett films, lipid bilayers, absorption and ordering of surfactant molecules. In October 1997 the Beam Facilities Consultative Group was established by ANSTO to advise on areas of research to be conducted at the new (2005) replacement research reactor and to propose a suite of neutron beam instruments. At the Group's conclusion in April 1998 they identified that neutron reflectometry and Small Angle Neutron Scattering (SANS) should share the highest priority out of the suite of cold neutron instruments at the facility. ANSTO recognised the need to develop expertise in and promote the use of neutron reflectometry in Australia prior to the building and operation of the new facility. In addition the instrument will be used for development and characterisation of neutron optical components for the new facility. Funding has been allocated by ANSTO, AINSE and an ARC RIEF grant to commence building a neutron reflectometer at HIFAR. It is to be installed on the 6HGR10 beam hole with a variable wavelength monochromator system. It is envisaged that the instrument may ultimately be transferred to the guide hall of the new facility. The basic design of the reflectometer to be installed at HIFAR will be presented along with projected instrumental specifications