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Title: Spin echo small angle neutron scattering using a continuously pumped {sup 3}He neutron polarisation analyser

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.
Authors:
; ; ; ; ; ; ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [1] ;  [5]
  1. Centre for Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47408 (United States)
  2. (United Kingdom)
  3. Department of Chemistry, The University of Sheffield, Sheffield S3 7HF (United Kingdom)
  4. National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
  5. (United States)
  6. Department of Physics and Astronomy, The University of Sheffield, Sheffield S3 7RH (United Kingdom)
  7. Department of Mechanical Engineering, The University of Sheffield, Sheffield S1 3DJ (United Kingdom)
Publication Date:
OSTI Identifier:
22392372
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; HELIUM 3; NEUTRON DIFFRACTION; NEUTRON SOURCES; NEUTRONS; OPTICAL PUMPING; PERFORMANCE; POLARIZATION; SMALL ANGLE SCATTERING; SPIN ECHO