The macromolecular neutron diffractometer (MaNDi) at the Spallation Neutron Source, Oak Ridge: enhanced optics design, high-resolution neutron detectors and simulated diffraction
The macromolecular neutron diffractometer (MaNDi) at the Spallation Neutron Source, Oak Ridge: enhanced optics design, high-resolution neutron detectors and simulated diffraction
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DOI：
10.1107/s0021889810008587
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发表时间：
2010-06-01
影响因子：
6.1
通讯作者：
Cooper, R.
中科院分区：
文献类型：
--
作者：
Coates, L.;Stoica, A. D.;Cooper, R.
目前，大分子中子衍射仪 MaNDi 正在橡树岭国家实验室散裂中子源第一靶站建设中。该仪器将从晶格常数在 100 至 300 埃之间的小型单晶 (0.1-1 mm(3)) 收集中子衍射数据，以及来自纤维等有序系统的数据。聚焦中子导管被设计用于过滤光谱的高能中子成分，并提供具有宽光谱窗口和对中子波长几乎不敏感的发散角的窄束。该系统包括最后一个可互换的中子导管部分和两个狭缝，可将样品位置处的水平和垂直束发散度调节在 0.12 至 0.80 度（半高全宽）之间。这允许根据科学要求以强度换取分辨率。还讨论了以可承受的价格增强和开发合适的高分辨率中子探测器的努力。最后，中子导管和探测器的参数被用来模拟大晶胞的衍射。 (c) 2010 年国际晶体学联合会新加坡印刷 - 保留所有权利
The macromolecular neutron diffractometer MaNDi is currently under construction at the first target station of the Spallation Neutron Source at Oak Ridge National Laboratory. This instrument will collect neutron diffraction data from small single crystals (0.1-1 mm(3)) with lattice constants between 100 and 300 angstrom, as well as data from less well ordered systems such as fibers. A focusing neutron guide has been designed to filter the high-energy neutron component of the spectrum and to provide a narrow beam with a wide spectral window and angular divergence almost insensitive to neutron wavelength. The system includes a final interchangeable section of neutron guide and two slits, which enable tuning of the horizontal and vertical beam divergence between 0.12 and 0.80 degrees (full width at half-maximum) at the sample position. This allows the trading of intensity for resolution, depending on the scientific requirements. Efforts to enhance and develop suitable high-resolution neutron detectors at an affordable price are also discussed. Finally, the parameters of the neutron guide and detectors were used to simulate diffraction from a large unit cell. (c) 2010 International Union of Crystallography Printed in Singapore - all rights reserved