Development of a Triple-Axis Neutron Spectrometer at the University of Missouri Research Reactor

通过密苏里大学哥伦比亚分校和爱荷华州立大学之间的合作项目，密苏里大学研究堆（MURR）的三轴中光谱仪将被更新，更高强度（3X），三轴中光谱仪（Triax）和双轴衍射仪取代，其强度是现有衍射仪的1.8倍。Triax现在位于橡树岭国家实验室，隶属于艾姆斯实验室。Triax将允许使用4英寸高，垂直聚焦单色晶体。样品的计算通量将与布鲁克海文国家实验室HFBR反应堆的H4M三轴仪器和美国国家标准与技术研究院NBSR反应堆的BT4机器具有竞争力。Triax的搬迁将为该国中西部地区的大批科学家提供工作设施所需的中子散射能力，并将用于培训和教育学生。Triax将在大约30%的时间内向外部用户开放。o操作和维护将由MURR提供。研究成果将涵盖材料和固态物理领域，包括：无序系统中的非弹性散射；磁性半导体;金属超晶格的弹性衍射；二元合金和多层材料中的自旋密度和电荷密度波固体的磁、电、动态特性；和极化中子散射实验。

Through this collaborative project between the University of Missouri-Columbia and Iowa State University, the triple-axis neutron spectrometer at the University of Missouri Research Reactor (MURR), will be replaced with a newer, higher intensity (3X), triple-axis neutron spectrometer (Triax), and a double-axis diffractometer having 1.8X the intensity of the present diffractometer. Triax, now located at Oak Ridge National Laboratory, is owned by the Ames Laboratory. Triax will allow use of a 4 inch high, vertically-focussing monochromator crystal. The calculated flux on the sample will be competitive with the H4M triple-axis instrument at HFBR reactor at Brookhaven National Laboratory, and the BT4 machine at the NBSR reactor at the National Institute of Standards and Technology. Relocation of Triax will provide needed neutron scattering capability at a working facility to a broad group of scientists in the Mid-west region of the country, and will serve to train and educate students. Triax will be available to outside users about thirty-percent of the time. o Operation and maintenance will be provided by MURR. %%% Research efforts which will benefit cover areas of materials and solid state physics including: inelastic scattering in disordered systems; magnetic semiconductors; elastic diffraction from metallic superlattices; spin density and charge density waves in binary alloys and multilayers; magnetic, electric, and dynamic properties of solids; and polarized neutron scattering experiments.