This title appears in the Scientific Report :
2021
New polarized neutron diffraction setup with 8 T magnet on POLI
New polarized neutron diffraction setup with 8 T magnet on POLI
The polarized single-crystal diffractometer POLI offers two types of polarized neutron diffraction experiments:spherical neutron polarimetry (SNP), also known as full three-dimensional polarization analysis in zero mag-netic field, and classical polarized neutron diffraction, also called flipping-ra...
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Personal Name(s): | Hutanu, Vladimir (Corresponding author) |
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Thoma, Henrik (Corresponding author) / Angst, Manuel / Roth, Georg | |
Contributing Institute: |
Heinz Maier-Leibnitz Zentrum; MLZ JCNS-4; JCNS-4 Streumethoden; JCNS-2 JARA-FIT; JARA-FIT JCNS-FRM-II; JCNS-FRM-II |
Imprint: |
2020
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Conference: | MLZ User Meeting & German Neutron Scattering Conference 2020, online event (Germany), 2020-12-08 - 2020-12-10 |
Document Type: |
Conference Presentation |
Research Program: |
Materials – Quantum, Complex and Functional Materials Jülich Centre for Neutron Research (JCNS) (FZJ) |
Subject (ZB): | |
Publikationsportal JuSER |
The polarized single-crystal diffractometer POLI offers two types of polarized neutron diffraction experiments:spherical neutron polarimetry (SNP), also known as full three-dimensional polarization analysis in zero mag-netic field, and classical polarized neutron diffraction, also called flipping-ratio (FR) method, in high appliedmagnetic fields. Recently, the available sample environment of POLI has been extended by an asymmetric fieldmagnet of 8 T. Although this new magnet is actively shielded, its stray fields are still too large to be used withthe sensitive 3He polarizer of the original SNP setup. To overcome this issue, a new, large-beam-cross-sectionsolid-state supermirror (SM) bender polarizer has been developed for POLI. An existing shielded Mezei-typeflipper is used between the magnet and SM polarizer. A dedicated guide field construction was numericallysimulated, optimized and built to link the magnetic field of the polarizer to the flipper and to the stray field ofthe magnet. An almost loss-free spin transport within the instrument in the complete field range of the newmagnet was achieved. The new setup was successfully implemented and tested. A high polarization efficiencyof above 99% for short wavelength neutrons could be experimentally reached with the new solid-state bender.The new high–field FR setup is now available for POLI’s user community. |