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Spin echo small angle neutron scattering using a continuously pumped (3)He neutron polarisation analyser
S R Parnell1, A L Washington1, K Li1
1Centre for Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47408, USA.
The Review of Scientific Instruments
|March 2, 2015
Summary
A new spin echo small angle neutron scattering (SESANS) instrument was developed. It features advanced resistive coils and a (3)He spin filter for precise neutron polarization analysis.
Area of Science:
- Neutron scattering physics
- Materials science instrumentation
Background:
- Small angle neutron scattering (SANS) is a powerful technique for probing nanoscale structures.
- Developing advanced neutron scattering instruments enhances research capabilities.
Purpose of the Study:
- To introduce a novel spin echo small angle neutron scattering (SESANS) instrument.
- To detail the instrument's components and performance characteristics.
Main Methods:
- Utilized resistive coils for encoding neutron trajectory into neutron polarization.
- Employed a continuously operating neutron spin filter with Rb spin-exchange optical pumping of (3)He for polarization analysis.
- Investigated scattering from silica Stöber particles.
Main Results:
- Resistive coils demonstrated effective performance across a wide range of neutron wavelengths.
- The (3)He spin filter provided stable polarization for SESANS measurements.
- Scattering data from silica Stöber particles showed agreement with results from similar instruments.
Conclusions:
- The new SESANS instrument is a capable tool for nanoscale structure analysis.
- The instrument's components, particularly the polarization encoding and analysis systems, perform reliably.
- This development expands the capacity for neutron scattering research at the Low Energy Neutron Source.
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