Test of a continuously polarized He-3 neutron spin filter with NMR-based polarization inversion on a single-crystal diffractometer
- Jones, Gordon L.
- Dias, Malcolm F., \u2705
- Collett, Brian
- Chen, W. C.
- Gentile, T. R.
- Piccoli, P. M. B.
- Miller, M. E.
- Schultz, A. J.
- Yan, H.
- Tong, X.
- Snow, W. M.
- Lee, W. T.
- Hoffmann, C.
- Thomison, J.
DOIAbstract
Spin filters based on the large spin dependence of the neutron absorption cross-section by 3 He are currently being applied in neutron scattering. We report here the construction and test of a He-3 neutron spin filter that incorporates (1) in situ continuous optical pumping to maximize the time-averaged polarization and maintain a stable He-3 polarization during experiments, and (2) low-loss adiabatic-fast-passage inversion of the He-3 polarization to eliminate the need for a neutron spin flipper. The device was successfully tested at the single-crystal diffractometer at the Intense-Pulsed Neutron Source, Argonne National Laboratory. This device can be used in measurements of static magnetic-materials as well as magnetic-relaxation phenomen...
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