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

V. G. Syromyatnikov; Сыромятников В. Г.; N. A. Grigoryeva; Григорьева Н. А.; S. V. Grigoriev; Григорьев С. В.

doi:10.31857/S102809602307018X

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

Authors: Syromyatnikov V.G.¹^,2, Grigoryeva N.A.², Grigoriev S.V.¹^,2
Affiliations:
1. Petersburg Nuclear Physics Institute, National Research Center “Kurchatov Institute”
2. St. Petersburg State University
Issue: No 7 (2023)
Pages: 93-101
Section: Articles
URL: https://rjsvd.com/1028-0960/article/view/664541
DOI: https://doi.org/10.31857/S102809602307018X
EDN: https://elibrary.ru/TEMOSE
ID: 664541

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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. A reflectometer designed for a compact neutron source DARIA is planned to measure the spectrum of a reflected “white” neutron beam using the time-of-flight method at a fixed glancing angle with the possibility of using both polarized and non-polarized neutrons. The main geometric and physical parameters of the neutron reflectometer are presented. With a neutron pulse duration τ = 100 µs and a total length of the time-of-flight base 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 spin flippers close to unity makes it possible to study magnetic thin-film nanostructures in detail.

Keywords

compact neutron source DARIA, neutron reflectometry, polarized neutrons, time-of-flight method.

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