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

被引：26

作者：

Parnell, S. R. ^{[1
]}

Washington, A. L. ^{[1
,2
]}

Li, K. ^{[1
]}

Yan, H. ^{[1
]}

Stonaha, P. ^{[1
]}

Li, F. ^{[1
]}

Wang, T. ^{[1
]}

Walsh, A. ^{[3
]}

Chen, W. C. ^{[4
,5
]}

Parnell, A. J. ^{[6
]}

Fairclough, J. P. A. ^{[2
]}

Baxter, D. V. ^{[1
]}

Snow, W. M. ^{[1
]}

Pynn, R. ^{[1
,7
]}

机构：

[1] Indiana Univ, Ctr Explorat Energy & Matter, Bloomington, IN 47408 USA

[2] Univ Sheffield, Dept Mech Engn, Sheffield S1 3DJ, S Yorkshire, England

[3] Univ Sheffield, Dept Chem, Sheffield S3 7HF, S Yorkshire, England

[4] NIST, Gaithersburg, MD 20899 USA

[5] Univ Maryland, College Pk, MD 20742 USA

[6] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England

[7] Oak Ridge Natl Lab, Neutron Sci Directorate, Oak Ridge, TN 37831 USA

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2015年 / 86卷 / 02期

基金：

美国国家科学基金会;

关键词：

STATE POLARIZING BENDER; 2ND TARGET STATION; COLD NEUTRONS; FILTER; FLIPPER; REFLECTOMETRY; PERFORMANCE; INSTRUMENT; DEVICES; DESIGN;

D O I：

10.1063/1.4909544

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

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 He-3. We describe the performance of the analyser along with a study of the 3He polarisation stability and its implications for SESANS measurements. Scattering from silica Stober particles is investigated and agrees with samples run on similar instruments. (c) 2015 AIP Publishing LLC.

引用

页数：10

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