Progress in Simulating/Realisation SESANS in Time-of-Flight Mode at Pusled and Stationary Neutron Sources

We created software to simulate the Larmor precession in a setup for SESANS with adiabatic/radio frequency flippers in magnets designed to measure the time-of-flight on pulsed or stationary neutron sources. The values and spatial configurations of the magnetic fields of the existing prototype magnet...

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Bibliographic Details
Published in:Surface investigation, x-ray, synchrotron and neutron techniques x-ray, synchrotron and neutron techniques, 2020-10, Vol.14 (Suppl 1), p.S108-S116
Main Authors: Kraan, W. H., Akselrod, L. A., Yashina, E. G., Sumbatyan, A. A., Grigoriev, S. V.
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Larmor precession
Magnets
Materials Science
Neutron sources
Neutrons
Surfaces and Interfaces
Thin Films
Time measurement
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Summary:We created software to simulate the Larmor precession in a setup for SESANS with adiabatic/radio frequency flippers in magnets designed to measure the time-of-flight on pulsed or stationary neutron sources. The values and spatial configurations of the magnetic fields of the existing prototype magnets we used as input data. For an empty setup, we calculate the polarization of a “divergent ribbon beam” 2 cm high, depending on the neutron wavelength λ. In the “scattering experiment”, we show how to convert λ to the “spin-echo length” δ. For λ = 10 Å, flippers at a distance of 140 cm and a radio frequency 1 MHz we find δ ≈ 10 μm. Extension to δ = 20 μm is realistic.
ISSN:1027-4510
1819-7094
DOI:10.1134/S1027451020070253