Advanced polarization analysis capability on the very small-angle neutron scattering instrument at the NIST Center for Neutron Research
نویسندگان
چکیده
Abstract The Very Small Angle Neutron Scattering (VSANS) diffractometer at the National Institute of Standards and Technology has been commissioned is in user program. A large available space nearly 2 m along beam sample area not only enhances existing SANS polarization analysis capability, but also makes it possible for implementation other capabilities which would be easily on instruments, including grazing-incidence small-angle neutron scattering with spherical polarimetry. We present two polarized setups, one high magnetic fields low fields, together a versatile flexible operational platform experiments. design magnetostatic cavity device that provides better field homogeneity thus longer 3 He relaxation time discussed. It consists an end-compensated shielded solenoid non-identical holes to accommodate divergent scattered constrained distance. Significant improvement neutronic performance, time, extended momentum transfer range are presented. Improved polarizing devices, double V-shaped supermirror polarizer, adiabatic radio-frequency spin flipper, analyzer have yielded initial instrumental flipping ratio 100, allowing higher sensitivity detection weak features sample.
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ژورنال
عنوان ژورنال: Journal of physics
سال: 2023
ISSN: ['0022-3700', '1747-3721', '0368-3508', '1747-3713']
DOI: https://doi.org/10.1088/1742-6596/2481/1/012006