论文标题
从中子源位置到探测器位置的间接几何中子光谱仪的模拟研究，欧洲剥落源的双佛罗
A simulational study of the indirect geometry neutron spectrometer, BIFROST at the European Spallation Source, from neutron source position to detector position
论文作者
论文摘要
欧洲散布来源（ESS）旨在成为世界上最强大的中子源，以及在接下来的几十年中的中子科学的旗舰。异常高的中子通量将为科学实验提供独特的机会，但也为探测器设定了很高的要求。最具挑战性的方面之一是速率能力，尤其是峰值瞬时速率能力，即每个通道击中检测器的中子数，或中子脉冲峰值的CM $^2 $。本文的主要目的是估算计划为ESS计划的三面仪器预期的事件速率，并证明使用强大的模拟工具来正确解释Crystalline材料中的中子传输。提出了从源到检测器位置的完整仿真模型，并使用多个仿真软件包进行了实施。对于单个探测器管瞬时入射速率，从单晶体中的Bragg峰最大为1.7 GHz，并且发现了0.3 MHz的钒样品。本文还包括新的热解石墨模型的首次应用，以及对不同仿真工具的比较，以突出其优势和劣势。
The European Spallation Source (ESS) is intended to become the most powerful spallation neutron source in the world and the flagship of neutron science in the upcoming decades. The exceptionally high neutron flux will provide unique opportunities for scientific experiments, but also set high requirements for the detectors. One of the most challenging aspects is the rate capability and in particular the peak instantaneous rate capability, i.e. the number of neutrons hitting the detector per channel or cm$^2$ 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.
