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A wide angle neutron spin filter system using polarized He |
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| Authors: | C.B. Fu T.R. GentileG.L. Jones W.C. Chen R. ErwinS. Watson C. Broholm J.A. Rodriguez-Rivera J. Scherschligt |
| Affiliation: | a National Institute of Standards and Technology, Gaithersburg, MD 20899, USA b Indiana University, Bloomington, IN 47408, USA c Physics Department, Hamilton College, Clinton, NY 13323, USA d Johns Hopkins University, Baltimore, MD 21218, USA e University of Maryland, College Park, MD 20742, USA |
| Abstract: | Polarized 3He neutron spin filters can operate over a wide neutron energy range and provide a large angular acceptance. A compact 3He 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 3He 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 3He gas in the polarizer, with only a small effect on the analyzer cells. The cell fabrication process, 3He spin flipper, and the holding magnetic field are discussed and we present the results of a first on-linetest. |
| Keywords: | Polarized 3He 3He neutron spin filter Wide angle 3He cell |
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