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Neutron spin evolution through broadband current sheet spin flippers.

Authors
  • Stonaha, P
  • Hendrie, J
  • Lee, W T
  • Pynn, Roger
Type
Published Article
Journal
Review of Scientific Instruments
Publisher
American Institute of Physics
Publication Date
Oct 01, 2013
Volume
84
Issue
10
Pages
105113–105113
Identifiers
DOI: 10.1063/1.4826086
PMID: 24182169
Source
Medline
License
Unknown

Abstract

Controlled 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.

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