Continuously operating compact He-3-based neutron spin filter
Type of Work
Physica B: Condensed Matter
Polarized 3 He can be used as a spin filter to polarize a broad energy spectrum of neutrons. As a prototype for use on the single-crystal diffractometer (SCD) at the spallation neutron source (SNS), we have built a compact system to continuously polarize a He-3 spin filter by spin-exchange optical pumping. Polarizing in the neutron beam provides a constant neutron polarization and reduces the sensitivity to relaxation mechanisms. The capability to operate in the presence of non-optimal magnetic field homogeneity allowed us to employ a highly compact solenoid only 9.5 cm in diameter and 20cm long. Using only 7W of laser light we maintained 44% (3)Hc polarization in an 11cm(3) cell, despite an overall cell relaxation time of approximate to 10h. Results from a test on the SCD at IPNS are discussed. Published by Elsevier B.V.
Jones, Gordon L.; Baker, James E. '04; Chen, W. C.; Collett, Brian; Cowan, J. A.; Dias, Malcolm F. '05; Gentile, T. R.; Hoffmann, C.; Koetzle, T.; Lee, W. T.; Littrell, K.; Miller, M.; Schultz, A.; Snow, W. M.; Tong, X.; Yan, H.; and Yue, Andrew T. '04, "Continuously operating compact He-3-based neutron spin filter" (2005). Hamilton Digital Commons.
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