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Neutron spin evolution through broadband current sheet spin flippers
P Stonaha1, J Hendrie, W T Lee
1Indiana University Center for the Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47405, USA.
The Review of Scientific Instruments
|November 5, 2013
Summary
We developed new neutron spin flippers for Spin Echo Scattering Angle Measurement (SESAME). These flippers precisely control neutron spin, crucial for advanced scattering experiments and minimizing depolarization.
Area of Science:
- Neutron scattering physics
- Materials science instrumentation
Background:
- Controlled neutron spin manipulation is essential for neutron scattering techniques.
- Existing methods require precise magnetic field control for accurate measurements.
Purpose of the Study:
- To design and characterize novel current-sheet neutron spin flippers for Spin Echo Scattering Angle Measurement (SESAME).
- To optimize flipper geometry for high magnetic fields and minimal neutron depolarization.
Main Methods:
- Construction of current-sheet spin flippers using open-faced solenoids with abrupt field reversal.
- Magnetic field mapping using analytical approximations and numerical boundary integral calculations.
- Simulation of neutron spin evolution through flipper geometries, including imperfections.
Main Results:
- Good agreement between mapped magnetic fields and both analytical and numerical calculations.
- Flipping efficiency is sensitive to gaps between current-carrying conductors.
- An interdigitated wire arrangement is necessary for flippers with inclined planes to prevent depolarization.
Conclusions:
- The developed analytical method allows for rapid Larmor phase calculations.
- Optimized flipper design, particularly interdigitated arrangements, is critical for SESAME applications.
- These neutron spin flippers enhance the precision and applicability of neutron scattering techniques.
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