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Additively Manufactured NdFeB Polyphenylene Sulfide Halbach Magnets to Generate Variable Magnetic Fields for Neutron
Tej Nath Lamichhane1, Timothy R Charlton2, Brian Andrews1
1Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA.
Additive manufacturing created custom Halbach arrays using bonded magnets. These arrays generate strong magnetic fields while preserving neutron beam polarization for advanced scientific research.
Area of Science:
- Physics
- Materials Science
- Engineering
Background:
- Halbach arrays are efficient for directed magnetic fields and gradients.
- They are crucial components in various electric machines and scientific instruments.
Purpose of the Study:
- To demonstrate additive manufacturing for creating customized Halbach array rings.
- To characterize the magnetic properties and field generation of these 3D-printed arrays.
- To assess the impact on polarized neutron beam polarization.
Main Methods:
- Utilized fused deposition modeling-based Big Area Additive Manufacturing.
- Employed polyphenylene sulfide-bonded NdFeB permanent magnets.
- Designed and printed compensated concentric Halbach array rings.
Main Results:
- Successfully fabricated custom Halbach array rings.
- Generated magnetic fields up to 0.30 T.
- Preserved 90% polarization of an axial neutron beam.
Conclusions:
- Additive manufacturing is effective for producing prototype Halbach arrays.
- The printed arrays exhibit desirable magnetic properties for applications like polarized neutron reflectometry.
- The technology shows promise for creating tailored magnetic field solutions.
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