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On a Two-Mode Time-of-Flight Neutron Reflectometer for the DARIA Compact Neutron Source

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Abstract

The concept of a two-mode neutron reflectometer with a polarizer, two spin flippers and an analyzer of polarization after passing through the sample is presented. The reflectometer designed for the DARIA compact neutron source is planned to measure the spectrum of a reflected white neutron beam using the time-of-flight method at a fixed grazing angle with the possibility of using both polarized and nonpolarized neutrons. The main geometric and physical parameters of the neutron reflectometer are presented. With a neutron-pulse duration of τ = 100 µs and a total length of the time-of-flight path length L = 8 m, the pulse-repetition rate can reach f = 165 Hz for the wavelength range Δλ = 3 Å and resolution Δλ ≅ 0.05 Å. The use of polarization-analysis elements of a reflectometer at a beam polarization exceeding 96% and an efficiency of the spin flippers close to unity makes it possible to study thin-film magnetic nanostructures in detail.

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Funding

The work was supported by the Ministry of Science and Higher Education of the Russian Federation under Agreement no. 075-15-2022-830 (continuation of Agreement no. 075-15-2021-1358 dated October 12, 2021).

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Authors and Affiliations

  1. Petersburg Nuclear Physics Institute, National Research Center “Kurchatov Institute”, 188300, Gatchina, Russia

    V. G. Syromyatnikov & S. V. Grigoryev

  2. St. Petersburg State University, 198504, Petrodvorets, St. Petersburg, Russia

    V. G. Syromyatnikov, N. A. Grigoryeva & S. V. Grigoryev

Authors
  1. V. G. Syromyatnikov
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  2. N. A. Grigoryeva
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  3. S. V. Grigoryev
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Correspondence to V. G. Syromyatnikov.

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Syromyatnikov, V.G., Grigoryeva, N.A. & Grigoryev, S.V. On a Two-Mode Time-of-Flight Neutron Reflectometer for the DARIA Compact Neutron Source. J. Surf. Investig. 17, 818–825 (2023). https://doi.org/10.1134/S1027451023040171

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