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欧洲散裂中子源间接几何结构中子谱仪BIFROST从中子源位置到探测器位置的模拟研究。

A simulational study of the indirect-geometry neutron spectrometer BIFROST at the European Spallation Source, from neutron source position to detector position.

作者信息

Klausz M, Kanaki K, Kittelmann T, Toft-Petersen R, Birk J O, Olsen M A, Zagyvai P, Hall-Wilton R J

机构信息

Hungarian Academy of Sciences, Centre for Energy Research, 1525 Budapest 114, PO Box 49, Hungary.

European Spallation Source ESS ERIC, PO Box 176, SE-221 00 Lund, Sweden.

出版信息

J Appl Crystallogr. 2021 Feb 1;54(Pt 1):263-279. doi: 10.1107/S1600576720016192.

DOI:10.1107/S1600576720016192
PMID:33833652
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7941315/
Abstract

The European Spallation Source (ESS) is intended to become the most powerful spallation neutron source in the world and the flagship of neutron science in upcoming decades. The exceptionally high neutron flux will provide unique opportunities for scientific experiments but also set high requirements for the detectors. One of the most challenging aspects is the rate capability and in particular the peak instantaneous rate capability, the number of neutrons hitting the detector per channel or cm at the peak of the neutron pulse. The primary purpose of this paper is to estimate the incident rates that are anticipated for the BIFROST instrument planned for ESS, and also to demonstrate the use of powerful simulation tools for the correct interpretation of neutron transport in crystalline materials. A full simulation model of the instrument from source to detector position, implemented with the use of multiple simulation software packages, is presented. For a single detector tube, instantaneous incident rates with a maximum of 1.7 GHz for a Bragg peak from a single crystal and 0.3 MHz for a vanadium sample are found. This paper also includes the first application of a new pyrolytic graphite model and a comparison of different simulation tools to highlight their strengths and weaknesses.

摘要

欧洲散裂中子源（ESS）旨在成为世界上最强大的散裂中子源，并在未来几十年内成为中子科学的旗舰项目。极高的中子通量将为科学实验提供独特的机会，但同时也对探测器提出了很高的要求。最具挑战性的方面之一是速率能力，特别是峰值瞬时速率能力，即在中子脉冲峰值时每个通道或每平方厘米撞击探测器的中子数。本文的主要目的是估计为ESS计划建造的BIFROST仪器预期的入射速率，并展示使用强大的模拟工具来正确解释晶体材料中的中子输运。本文介绍了一个从源到探测器位置的仪器完整模拟模型，该模型是使用多个模拟软件包实现的。对于单个探测器管，发现单晶布拉格峰的瞬时入射速率最高为1.7 GHz，钒样品的瞬时入射速率为0.3 MHz。本文还首次应用了一种新的热解石墨模型，并比较了不同的模拟工具，以突出它们的优缺点。

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本文引用的文献

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Optimization of moderators and beam extraction at the ESS.欧洲散裂中子源慢化剂及束流引出的优化
J Appl Crystallogr. 2018 Mar 12;51(Pt 2):264-281. doi: 10.1107/S1600576718002406. eCollection 2018 Apr 1.
2
Prototype of the novel CAMEA concept-A backend for neutron spectrometers.新型CAMEA概念的原型——一种用于中子谱仪的后端设备。
Rev Sci Instrum. 2018 Jan;89(1):015105. doi: 10.1063/1.5018233.
3
CAMEA--A novel multiplexing analyzer for neutron spectroscopy.CAMEA——一种用于中子光谱学的新型多路复用分析仪。
Rev Sci Instrum. 2016 Mar;87(3):035109. doi: 10.1063/1.4943208.
4
Prismatic analyser concept for neutron spectrometers.用于中子谱仪的棱镜分析仪概念
Rev Sci Instrum. 2014 Nov;85(11):113908. doi: 10.1063/1.4901160.