Time-of-Flight Neutron Reflectometer for the DARIA Compact Neutron Source: Monte Carlo Simulation

被引：0

作者：

Grigoryeva, N. A. ^{[1
]}

Kovalenko, N. A. ^{[2
,3
]}

Grigoriev, S. V. ^{[2
,3
]}

机构：

[1] Russian Acad Sci, Mikheev Inst Met Phys, Ural Branch, Ekaterinburg 620108, Russia

[2] St Petersburg State Univ, St Petersburg 199034, Russia

[3] Kurchatov Inst, Konstantinov Petersburg Nucl Phys Inst, Nucl Res Ctr, Gatchina 188300, Leningradskaya, Russia

来源：

JOURNAL OF SURFACE INVESTIGATION | 2024年 / 18卷 / 06期

关键词：

DARIA compact neutron source; reflectometer; modeling; transmitted-pulse resolution of a reflectometer; Monte Carlo method; FILM;

D O I：

10.1134/S102745102470160X

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Two types of polarized neutron reflectometers have been simulated for the compact neutron source DARIA (Dedicated for Academical Research and Industrial Application), depending on the type of target assembly with thermal or cryogenic moderators. Modeling and optimization of reflectometers were carried out using McStas software package by the Monte Carlo method with specified momentum transfer resolution Delta q/q <= 5% for reflection angles greater than the critical angle theta(cr) and a neutron beam horizontal divergence of Delta theta <= 0.1 degrees for theta < theta(cr) and Delta theta <= 0.033 degrees for theta > theta(cr). To reduce losses in neutrons, neutron guides with a supermirror coating have been proposed. A system of choppers makes it possible to create a neutron spectrum of the required width on a sample.

引用

页码：1602 / 1614

页数：13