新型弯曲完美硅晶体聚焦中子单色器的研究和应用

With construction of the high flux reactor neutron source and the spallation neutron source in our country, the application of neutron scattering experimental techniques in multidisciplinary fields will become increasingly more extensive. In the current hot research fields, more and more research objects are very difficult to be prepared when the quality of the sample is of gram magnitude, such as films, nano material, biological molecules and proteins. However, low efficiency and poor resolution are widespread problems in the measurement of currently existing neutron scattering spectrometers for small quality samples. Based on the neutron scattering diffractometers at China Advanced Research Reactor ( CARR ) , this project suggest a technique to increase the neutron flux at the sample position.We also suggest a experiment method of fast measurement especially suitable for small quality samples with high resolution.Novel focusing neutron monochromators are the core equipment to realize the experimental technique. We will focus on the development of this kind of neutron monochromators empolying bending perfect silicon single crystal as monochromator crystal materials, which will be applied to the residual stress diffractometer of CARR. Our aim is to serve the project of CARR neutron scattering spectrometer construction and to carry out experimental technique studies combined with the actual research demand of modern new materials. By developing key experimental equipment , we will further inspect and apply these technic and method. The project will provide basic technical support for neutron scattering multidisciplinary applications.

随着我国高通量反应堆中子源和散裂中子源的相继建造，中子散射实验技术在多学科领域的应用将更加广泛。在当前热点研究领域中，越来越多的研究对象在制备质量在克数量级的样品时非常困难，例如薄膜、纳米、生物大分子和蛋白质等材料，而现有中子散射谱仪在测量小样品时普遍存在效率低、分辨较差的问题。针对上述问题，本项目基于中国先进研究堆（CARR）现有中子散射谱仪，提出最大限度提升样品位置中子通量的技术方法以及一种适合小样品的高分辨快速测量实验方法。新型聚焦中子单色器是实现这些实验方法的核心设备，本项目将重点研究采用弯曲完美硅单晶作为单色器晶体材料的新型聚焦中子单色器，并且将其应用于CARR堆中子残余应力谱仪上。本项目以服务CARR中子散射谱仪建造工程为中心，结合现代新材料研究的实际需求，开展实验方法学研究，并且通过研制与之配套的关键实验设备检验和应用方法学研究的成果，为中子散射的多学科应用提供基础技术保障。