In-situ polarized 3 He-based neutron polarization analyzer for SNS magnetism reflectometer
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Insitute of Physics
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.
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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. Paper presented to the International Conference on Neutron Scattering 2009, 3th–7th May 2009. Knoxville, Tennessee, USA. In Journal of Physics: Conference Series, 251(1), 012086. doi:10.1088/1742-6596/251/1/012086