Spin echo small angle neutron scattering using a continuously pumped {sup 3}He neutron polarisation analyser
- Centre for Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47408 (United States)
- Department of Chemistry, The University of Sheffield, Sheffield S3 7HF (United Kingdom)
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
- Department of Physics and Astronomy, The University of Sheffield, Sheffield S3 7RH (United Kingdom)
- Department of Mechanical Engineering, The University of Sheffield, Sheffield S1 3DJ (United Kingdom)
We present a new instrument for spin echo small angle neutron scattering (SESANS) developed at the Low Energy Neutron Source at Indiana University. A description of the various instrument components is given along with the performance of these components. At the heart of the instrument are a series of resistive coils to encode the neutron trajectory into the neutron polarisation. These are shown to work well over a broad range of neutron wavelengths. Neutron polarisation analysis is accomplished using a continuously operating neutron spin filter polarised by Rb spin-exchange optical pumping of {sup 3}He. We describe the performance of the analyser along with a study of the {sup 3}He polarisation stability and its implications for SESANS measurements. Scattering from silica Stöber particles is investigated and agrees with samples run on similar instruments.
- OSTI ID:
- 22392372
- Journal Information:
- Review of Scientific Instruments, Vol. 86, Issue 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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