中国先进研究堆中子织构谱仪二维位置灵敏探测器数据分析与处理方法  

Data Analysis and Processing Method for Two-dimensional Position Sensitive Detector of Neutron Texture Diffractometer at China Advanced Research Reactor

作　　者：朱桂杰 刘晓龙[1] 田庚方[1] 侯宇晗 王洪亮 于艳丽 薛耀辉 李玉庆[1] 李眉娟[1] 孙凯[1] 陈东风[1] ZHU Guijie;LIU Xiaolong;TIAN Gengfang;HOU Yuhan;WANG Hongliang;YU Yanli;XUE Yaohui;LI Yuqing;LI Meijuan;SUN Kai;CHEN Dongfeng(China Institute of Atomic Energy,Beijing 102413,China;China International Engineering Consulting Corporation,Beijing 100048,China)

机构地区：[1]中国原子能科学研究院,北京102413 [2]中国国际工程咨询有限公司,北京100048

出　　处：《原子能科学技术》2023年第4期857-864,共8页Atomic Energy Science and Technology

基　　金：国家财政部稳定支持研究经费(WDJC-2019-04);中核集团领创科研计划(LC202309000301)。

摘　　要：中子织构谱仪在航空航天、交通、核工业等领域关键材料的织构研究中具有独特的优势。为了提升探测效率,中国先进研究堆中子织构谱仪在2020—2021年进行了升级改造,将探测系统从单个3He计数管升级为大尺寸二维位置灵敏探测器。本研究针对中国先进研究堆中子织构谱仪升级后的实验测量数据,提出了从二维位置灵敏探测器获得的衍射中子计数到织构极图转换的数据处理与分析方法,并基于该方法使用Python语言开发了中子织构数据处理和分析软件系统,对实际测量数据的应用验证了该软件系统的可靠性。该系统实现了二维位置灵敏探测器数据到极图数据的转换和极图绘制,满足了中子织构谱仪升级后的功能需求。The neutron texture diffractometer has unique advantage in the texture research for the key materials in the fields of aerospace,transportation,nuclear industry and so on.In order to improve the detection efficiency,the detection system of the neutron texture diffractometer at China Advanced Research Reactor(CARR)has been upgraded from a single 3He counter tube to a large-area two-dimensional position sensitive detector during 2020-2021.However,due to the difference of configuration and hardware design of the neutron texture diffractometer at the major neutron scattering laboratories in the world,the formats of obtained experimental data are also different,which results in the significant difference of the data analysis and processing.Therefore,the new method and software should be proposed to analyze the experimental data collected from two-dimensional position sensitive detector of neutron texture diffractometer at CARR.The results of texture measurement using neutron texture diffractometer generally were represented by pole figure.The pole figure window resolution of the texture diffractometer is an important factor affecting the results of texture measurement.Due to the diffraction signal of larger range angles along the longitudinal direction(αdirection)can be detected by the two-dimensional position-sensitive detector,therefore,in order to meet the demand of texture measurement for resolution,the diffraction data should be firstly divided into several pieces in longitudinal direction to adjust theαdirection resolution of the pole figure window.Then,during data preprocessing,it is key to accurately obtain the integral intensity of the diffraction peak for getting an accurate pole figure.However,the position of diffraction peaks may shift slightly due to the possible eccentricity during sample installation and uneven background of diffraction spectrum caused by noise,which result in the inaccurate fitting results.Moreover,generally the massive experimental data were collected by the two-dimensional sensitiv

关 键 词：中子织构谱仪 织构数据分析 二维位置灵敏探测器 极图 Python 

分 类 号：O571.56[理学—粒子物理与原子核物理]