Conceptual Design of a Long Wavelength Target Station at the Spallation Neutron Source

该合同支持散裂中子源长波目标站的概念设计，以及设计开发和研发，以支持建设。第二个长波目标站将利用SNS加速器来提高中子散射仪器的性能，利用波长大于2埃的中子（与SNS项目正在建造的高功率目标站相比）。这将显著提高SNS在磁学、聚合物科学、生物材料和结构生物学、液体和非晶态材料以及其他特征长度大于10埃、特征能量小于1 meV的领域的学术用户群体的能力。仪器设计和科学将由科学界开发，并与产生中子的目标和慢化剂系统的设计相协调。中子是研究材料结构和动力学的有力工具。测量从材料中散射的中子产生的模式的仪器可以用来确定原子的位置和它们的运动方式。该提案将资助在橡树岭新建的中子散射实验室散裂中子源（Spallation Neutron Source）建造实验大厅和相关仪器的设计工作。为SNS建造的同一个加速器也可以用来在第二个长波靶站产生中子。在SNS中增加这样一个目标站，将大大提高SNS在物理、化学、生物、工程材料和纳米材料等领域的学术研究能力。该提案将涉及来自许多机构的研究人员设计和开发设施及其仪器，并在第一年完成长波目标站的完整提案***

0073038MasonThis award supports the conceptual design of a Long Wavelength Target Station at the Spallation Neutron Source as well as design development and R&D to support construction. A second, long wavelength target station would make use of the SNS accelerator to increase the performance of neutron scattering instruments making use of neutrons with wavelengths greater than two angstroms (compared to the High Power Target Station being built by the SNS Project). This will significantly enhance the capabilities of SNS for the academic user community in magnetism, polymers science, biomaterials and structural biology, liquids and amorphous materials, and other fields where characteristic lengths are greater than ten angstroms and characteristic energies are less than 1 meV. Instrument designs and the science they will enable will be developed by the scientific community and coordinated with the design of the target and moderator systems that produce the neutrons. . %%% Neutrons are a powerful tool for the study of the structure and dynamics of materials. Instruments that measure the patterns produced by neutrons scattered from materials can be used to determine where the atoms are and how they move. This proposal will fund work to develop a design for an experimental hall and associated instruments to be built at the Spallation Neutron Source, a new neutron scattering laboratory being built in Oak Ridge. The same accelerator being built for SNS can also be used to produce neutrons at this second, Long Wavelength Target Station. Adding such a target station to SNS will greatly enhance its scientific capacity for academic researchers in physics, chemistry, biology, engineering materials, and nanomaterials. The proposal will involve researchers from many institutions in the design and development of a facility and its instrumentation with a full proposal for the Long Wavelength Target Station to be completed in the first year***