In-situ Polarized He3-Based Neutron Polarization Analyzer for SNS Magnetism Reflectometer

Published

January 31, 2011

Author(s)

W-T Lee, X Tong, J. Pierce, M. Fleenor, A. Ismaili, JL Robertson, Wangchun Chen, Thomas R. Gentile, A. Hailemariam, R J. Goyette, A. Parizzi, V Lauter, F. Klose, H. Kaiser, C. Lavelle, DV Baxter, G L. Jones, J. Wexler, L. McCollum

Abstract

We report here the construction and neutron transmission test results of an in-situ polarized 3He-based neutron polarization analyzer system for the Magnetism Reflectometer at the Spallation Neutron Source, Oak Ridge National Laboratory. The analyzer uses the Spin-Exchange Optical Pumping method to polarize the 3He nuclei of a cell of 3He gas. Polarized neutrons scattered from the sample are intercepted by the polarized 3He gas which strongly absorbs neutrons in one spin-state while allowing most neutrons in the other spin-state to pass through. To maintain a stable analyzing efficiency during an experiment, the 3He gas is continuously polarized in-situ on the instrument. Neutron transmission measurements showed that 73% 3He polarization was reached in this setup.

Citation

Journal of Physics: Conference Series

Issue

251

Pub Type

Journals

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Keywords

He-3, in-situ, magnetism reflectrometer, neutron polarization

Citation

Lee, W. , Tong, X. , Pierce, J. , Fleenor, M. , Ismaili, A. , Robertson, J. , Chen, W. , Gentile, T. , Hailemariam, A. , Goyette, R. , Parizzi, A. , Lauter, V. , Klose, F. , Kaiser, H. , Lavelle, C. , Baxter, D. , Jones, G. , Wexler, J. and McCollum, L. (2011), In-situ Polarized He3-Based Neutron Polarization Analyzer for SNS Magnetism Reflectometer, Journal of Physics: Conference Series, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=903159 (Accessed October 8, 2025)