Center for High Resolution Neutron Scattering (CHRNS)

该合同将继续支持位于NIST冷中子指南大厅的中子散射用户设施的建立和运行。该项目由NSF和NIST联合资助。非常适合于中子散射界的仪器将提供先进的中子散射仪器的平衡截面，用于高分辨率研究几乎所有类别材料的微结构和动力学。用户可以使用的仪器包括具有偏振光束能力的小角中子散射(SANS)光谱仪，以及使用超镜偏振器和“Drabkin”鳍状物的自旋非弹性中子散射(SPINS)光谱仪。自旋光谱仪可能在能量分辨率上比传统的三轴光谱仪提高一个数量级，这将为研究凝聚态系统中的低能激发开辟新的机会。SPINS项目的费用由NSF和NIST平分(50/50)。SANS仪器有望被凝聚态物理、化学、生物和材料科学领域的研究人员充分利用，以获得从1纳米到近500纳米尺度的结构信息，涉及聚合物、金属合金、陶瓷、多孔介质结构流体和凝胶、生物大分子和磁性材料等材料，这些材料在许多情况下是任何其他技术无法获得的。这些仪器将提供在这个国家无与伦比的最先进的能力，并将与世界上最好的设施竞争。仪器将在用户模式下运行。建议的审查和选择将由外部计划咨询委员会进行，建议的选择将基于所提议项目的科学价值。//

This award provides continuing support for the establishment and operation of the neutron scattering user facility located at NIST in the Cold Neutron Guide Hall. The project is funded jointly by NSF and NIST. Instrumentation well suited to the neutron scattering community will offer a balanced cross section of advanced neutron scattering instrumentation for high resolution studies of the microstructure and dynamics of virtually all classes of materials. Instruments available to users will include a small-angle neutron scattering (SANS) spectrometer with polarized beam capability, and a spin inelastic neutron scattering (SPINS) spectrometer using supermirror polarizers and a "Drabkin" flipper. The SPINS spectrometer can potentially achieve an order of magnitude improvement in energy resolution over conventional triple-axis spectrometers, which would open up new opportunities in the study of low energy excitation in condensed matter systems. The SPINS project is cost-shared equally (50/50) between NSF and NIST. The SANS instrument is expected to be fully utilized by researchers in condensed matter physics, chemistry, biology and materials science to obtain structural information on a scale size from 1 to nearly 500 nanomicrometers, on materials such as polymers, metal alloys, ceramics, porous media structured fluids and gels, biological macromolecules and magnetic materials that in many cases cannot be obtained by any other techniques. These instruments will provide state-of-the-art capability unequaled in this country, and will be competitive with the best facilities worldwide. The instruments will be operated in a user mode. Proposal review and selection will be by an external Program Advisory Committee, with proposal selection being based on scientific merit of the projects proposed.//