Spin echo small angle neutron scattering using a continuously pumped (3)He neutron polarisation analyser

The Review of Scientific Instruments
S R ParnellR Pynn

Abstract

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 (3)He. We describe the performance of the analyser along with a study of the (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.

References

Apr 12, 2006·Physical Review Letters·E BabcockT R Gentile
Jul 8, 2008·The Review of Scientific Instruments·Roger PynnB B Maranville
Jun 2, 2014·The Review of Scientific Instruments·F LiR Pynn

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Citations

Apr 3, 2016·The Review of Scientific Instruments·T WangR Pynn
Mar 6, 2018·Reviews of Modern Physics·T R GentileT G Walker
Jun 14, 2019·Scientific Reports·Fankang LiRoger Pynn
Dec 3, 2016·The Review of Scientific Instruments·T InoK Sakai
Apr 10, 2021·Journal of Applied Crystallography·Wim G BouwmanPeter Willendrup

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