Spin echo small angle neutron scattering using a continuously pumped (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...

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Bibliographic Details
Published in:	Review of scientific instruments 2015-02, Vol.86 (2), p.023902-023902
Main Authors:	Parnell, S R, Washington, A L, Li, K, Yan, H, Stonaha, P, Li, F, Wang, T, Walsh, A, Chen, W C, Parnell, A J, Fairclough, J P A, Baxter, D V, Snow, W M, Pynn, R
Format:	Article
Language:	eng
Subjects:	HELIUM 3 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY NEUTRON DIFFRACTION NEUTRON SOURCES NEUTRONS OPTICAL PUMPING POLARIZATION SMALL ANGLE SCATTERING SPIN ECHO
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Summary:	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.
ISSN:	0034-6748 1089-7623