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Title: In-situ Polarized 3 He-Based Neutron Polarization Analyzer for SNS Magnetism Reflectometer
Authors: Lee, WT
Tong, X
Pierce, J
Fleenor, M
Ismaili, A
Robertson, JL
Chen, WC
Gentile, TR
Hailemariam, A
Goyette, R
Parizzi, A
Lauter, V
Klose, F
Kaiser, H
Lavelle, C
Baxter, DV
Jones, GL
Wexler, J
McCollum, L
Keywords: Polarization
Neutron Sources
Measuring Instruments
Optical Pumping
Issue Date: 16-Dec-2010
Publisher: Insitute of Physics
Citation: Lee, W.T., Tong, X., Pierce, J., Fleenor, M., Ismaili, A., Robertson, J.L., Chen, W.C., Gentile, T.R., Hailemariam, A., Goyette, T.R., Parizzi, A., Lauter, V., Klose F., Kaiser, H., Lavelle, C., Baxter, D.V., Jones, G.L., Wexler J., McCollum L. (2010). In-situ Polarized 3 He-Based Neutron Polarization Analyzer for SNS Magnetism Reflectometer, Journal of Physics: Conference Series, International Conference on Neutron Scattering 2009, 3th–7th May 2009. Knoxville, Tennessee, USA, 251(1), Art. No. 012086.
Abstract: We report here the construction and neutron transmission test results of an in-situ polarized 3 He-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 3 He nuclei of a cell of 3 He gas. Polarized neutrons scattered from the sample are intercepted by the polarized 3 He 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 3 He gas is continuously polarized in - situ on the instrument. Neutron transmission measurements showed that 73% 3 He polarization was reached in this setup. © 2010, Insitute of Physics.
ISSN: 1742-6596
Appears in Collections:Conference Publications

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