Finite element analysis of zero magnetic field shielding for polarized neutron scattering
نویسندگان
چکیده
<sec>Polarized neutron scattering, as one of the experimental techniques is a powerful tool for exploring microstructure matter. In polarized scattering experiments, magnetic field maintains and guides polarization, determines sample environment. For complex sample, it often necessary to apply zero-field environment at position, so that general polarization analysis becomes feasible. To achieve effective experiment, carefully designing shielding constrain required.</sec><sec>In this work, we demonstrate chamber designed experiment by utilizing both permalloy material high-T<sub>C</sub> superconducting films. This design adopts simple low-maintenance ‘deep-well’ shape shielding. The study uses finite element simulation method analyze effect dimension on performance device model, including height, arm length, opening radius, superconductor distance. At optimal dimensions, zero achieves an internal integral 0.67 G·cm along path under geomagnetic condition. maximum deflection 0.4 nm neutrons 0.76%, which reaches advanced level. results are verified Bloch equation dynamics simulations actual measurement sell. According established design, further discuss relationship between dimensions device. application spectrometers future improvement in structure also discussed.</sec>
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ژورنال
عنوان ژورنال: Chinese Physics
سال: 2023
ISSN: ['1000-3290']
DOI: https://doi.org/10.7498/aps.72.20230559