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

Journal article (2020)

Authors

W.H. Kraan RST/Neutron and Positron Methods in Materials - AS
L. A. Akselrod Petersburg Nuclear Physics Institute (PNPI)
E. G. Yashina Petersburg Nuclear Physics Institute (PNPI)
A.A. Sumbatyan Petersburg Nuclear Physics Institute (PNPI)
S. V. Grigoriev Petersburg Nuclear Physics Institute (PNPI)
Research Group
RST/Neutron and Positron Methods in Materials (AS) (TU Delft)
Small angle neutron scattering Larmor precession Matrix multiplication
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Published Date

2020

Language

English

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Neutron and Positron Methods in Materials

Abstract

Abstract: 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.