Neutron spin evolution through broadband current sheet spin flippers

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dc.contributor.authorStonaha, Pen_AU
dc.contributor.authorHendrie, Jen_AU
dc.contributor.authorLee, WTen_AU
dc.contributor.authorPynn, Ren_AU
dc.date.accessioned2014-05-09T06:01:03Zen_AU
dc.date.available2014-05-09T06:01:03Zen_AU
dc.date.issued2013-10-01en_AU
dc.date.statistics2014-05-09en_AU
dc.description.abstractControlled manipulation of neutron spin is a critical tool for many neutron scattering techniques. We have constructed current-sheet, neutron spin flippers for use in Spin Echo Scattering Angle Measurement (SESAME) that comprise pairs of open-faced solenoids which introduce an abrupt field reversal at a shared boundary. The magnetic fields generated by the coils have been mapped and compared with both an analytical approximation and a numerical boundary integral calculation. The agreement is generally good, allowing the former method to be used for rapid calculations of the Larmor phase acquired by a neutron passing through the flipper. The evolution of the neutron spin through the current sheets inside the flipper is calculated for various geometries of the current-carrying conductors, including different wire shapes, arrangements, and common imperfections. The flipping efficiency is found to be sensitive to gaps between wires and between current sheets. SESAME requires flippers with high fields and flipping planes inclined to the neutron beam. To avoid substantial neutron depolarization, such flippers require an interdigitated arrangement of wires. © 2013, American Institute of Physics.en_AU
dc.identifier.articlenumber105113en_AU
dc.identifier.citationStonaha, P., Hendrie, J., Lee, W. T., & Pynn, R. (2013). Neutron spin evolution through broadband current sheet spin flippers. Review of Scientific Instruments, 84(10), 105113. doi:10.1063/1.4826086en_AU
dc.identifier.govdoc5396en_AU
dc.identifier.issn0034-6748en_AU
dc.identifier.issue10en_AU
dc.identifier.journaltitleReview of Scientific Instrumentsen_AU
dc.identifier.urihttp://dx.doi.org/10.1063/1.4826086en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5562en_AU
dc.identifier.volume84en_AU
dc.language.isoenen_AU
dc.publisherAmerican Institute of Physicsen_AU
dc.subjectScatteringen_AU
dc.subjectLarmor precessionen_AU
dc.subjectNeutronsen_AU
dc.subjectSpinen_AU
dc.subjectMagnetic fieldsen_AU
dc.subjectMagnetismen_AU
dc.titleNeutron spin evolution through broadband current sheet spin flippersen_AU
dc.typeJournal Articleen_AU
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