A wide angle neutron spin filter system using polarized He-3
- Fu, C. B.
- Gentile, T. R.
- Jones, Gordon L.
- Chen, W. C.
- Erwin, R.
- Watson, S.
- Broholm, C.
- Rodriguez-Rivera, J. A.
- Scherschligt, J.
DOIAbstract
Polarized He-3 neutron spin filters can operate over a wide neutron energy range and provide a large angular acceptance. A compact He-3 neutron spin filter system has been developed for the Multi-Axis Crystal Spectrometer at the National Institute of Standards and Technology (NIST) Center for Neutron Research. Sealed He-3 cells, polarized by spin-exchange optical pumping, are used as polarizer and analyzer. The polarization of the neutrons incident on the sample is inverted by flipping the polarization of the He-3 gas in the polarizer, with only a small effect on the analyzer cells. The cell fabrication process, He-3 spin flipper, and the holding magnetic field are discussed and we present the results of a first on-line test. (C) 2010 Elsev...
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