中国绵阳研究堆CMRR中子散射平台及应用  

The neutron scattering platform of China Mianyang Research Reactor(CMRR) and recent applications

作　　者：孙光爱[1] 刘栋 龚建[1] 彭述明[1] SUN GuangAi;LIU Dong;GONG Jian;PENG ShuMing(Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621999,China)

机构地区：[1]中国工程物理研究院核物理与化学研究所,绵阳621999

出　　处：《中国科学：物理学、力学、天文学》2021年第9期85-95,共11页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金联合基金重点项目(编号:U1830205)资助。

摘　　要：20 MW中国绵阳研究堆(CMRR)上的中子科学平台,首期建设6台散射谱仪和2台中子成像装置,从2013年以来全部投入使用. CMRR的中子科学平台,可分别从事热、冷中子散衍射实验测试.实测用于中子散射实验的热中子注量率为2.4×10^(14)n cm^(-2)s^(-1),冷中子注量率为109n cm^(-2)s^(-1).首期运行的谱仪分别为:高分辨中子衍射仪(HRND)、中子应力分析谱仪(RSND)、高压中子衍射仪(HPND)、小角中子散射谱仪(SANS)、飞行时间极化中子反射谱仪(TPNR)、冷中子三轴谱仪(CTAS)和冷/热中子成像装置(CNR).此外,二期有8台自主建设的谱仪,将在未来2–5年内建成并投入使用.目前CMRR每年运行超200天,其中提供给用户的束流超60%.本文重点介绍了CMRR中子科学平台及其在软物质、磁性膜材料、航空、基础物理等领域的典型应用.The 20-MW China Mianyang Research Reactor’s(CMRR) neutron science platform has been in use since 2013. In the first phase, there are six scattering spectrometers and two neutron imaging devices. For neutron scattering experiments,the thermal and cold fluxes are measured to be 2.4×10^(14) and 10^(9) n cm^(-2)s^(-1), respectively. The neutron instruments used in the first phase include a high-resolution neutron diffractometer, residual stress neutron diffractometer, thermal neutron radiography station, high-pressure neutron diffractometer, small-angle neutron scattering, time-of-flight and polarized neutron reflectometer, cold neutron triple-axis spectrometer, and cold/thermal neutron radiography station. In addition,eight second-phase spectrometers are currently under construction and will be operational in the next two to five years.CMRR currently operates for more than 200 days a year, with more than 60% of the beam time supplied to users. This paper focuses on the neutron science platform of CMRR and its typical applications in the fields of soft matter, magnetic membrane materials, aviation, basic physics, etc.

关 键 词：中国绵阳研究堆 中子科学平台 中子衍射 中子散射 

分 类 号：TL411[核科学技术—核技术及应用]