Double-Focusing Thermal Triple-Axis Spectrometer at the NCNR.
Double-Focusing Thermal Triple-Axis Spectrometer at the NCNR.
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DOI：
10.6028/jres.117.002
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发表时间：
2012
影响因子：
1.5
通讯作者：
Erwin RW
中科院分区：
文献类型：
--
作者：
Lynn JW;Chen Y;Chang S;Zhao Y;Chi S;Ratcliff W 2nd;Ueland BG;Erwin RW
NIST中子研究中心(NCNR)的新热三轴光谱仪位于BT-7束流端口。直径165 mm的反应堆光束配备了精选的S准直器、光束限制器和热解石墨(PG)过滤器，用于定制用于双20×20cm2双聚焦单色仪系统的光束，该系统向样品提供超过108n/cm2/S的单色通量。安装的两个单色器是PG(002)和Cu(220)，它们提供从5 meV到500 meV以上的入射能量。计算机控制的分析器系统提供六种标准操作模式，包括衍射探测器、处于衍射模式的位置灵敏探测器(PSD)、带探测器的水平能量聚焦分析器、使用平板分析器和PSD的Q-E模式、使用分析器晶体系统和PSD的恒定E模式以及选择S准直器和探测器的常规模式。还可以根据特定的测量需求进行其他配置。本文讨论了这种新的最先进的中子谱仪的能力和性能。
The new thermal triple-axis spectrometer at the NIST Center for Neutron Research (NCNR) is located at the BT-7 beam port. The 165 mm diameter reactor beam is equipped with a selection of Söller collimators, beam-limiters, and a pyrolytic graphite (PG) filter to tailor the beam for the dual 20×20 cm2 double-focusing monochromator system that provides monochromatic fluxes exceeding 108 n/cm2/s onto the sample. The two monochromators installed are PG(002) and Cu(220), which provide incident energies from 5 meV to above 500 meV. The computer controlled analyzer system offers six standard modes of operation, including a diffraction detector, a position-sensitive detector (PSD) in diffraction mode, horizontal energy focusing analyzer with detector, a Q-E mode employing a flat analyzer and PSD, a constant-E mode with the analyzer crystal system and PSD, and a conventional mode with a selection of Söller collimators and detector. Additional configurations for specific measurement needs are also available. This paper discusses the capabilities and performance for this new state-of-the-art neutron spectrometer.