Ehlers G, Podlesnyak A A, Niedziela J L, Iverson E B, Sokol P E
Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Rev Sci Instrum. 2011 Aug;82(8):085108. doi: 10.1063/1.3626935.
The design and performance of the new cold neutron chopper spectrometer (CNCS) at the Spallation Neutron Source in Oak Ridge are described. CNCS is a direct-geometry inelastic time-of-flight spectrometer, designed essentially to cover the same energy and momentum transfer ranges as IN5 at ILL, LET at ISIS, DCS at NIST, TOFTOF at FRM-II, AMATERAS at J-PARC, PHAROS at LANSCE, and NEAT at HZB, at similar energy resolution. Measured values of key figures such as neutron flux at sample position and energy resolution are compared between measurements and ray tracing Monte Carlo simulations, and good agreement (better than 20% of absolute numbers) has been achieved. The instrument performs very well in the cold and thermal neutron energy ranges, and promises to become a workhorse for the neutron scattering community for quasielastic and inelastic scattering experiments.
本文描述了位于橡树岭散裂中子源的新型冷中子斩波器谱仪（CNCS）的设计与性能。CNCS是一台直接几何结构的非弹性飞行时间谱仪，其设计初衷是在能量分辨率相近的情况下，基本覆盖与法国劳厄 - 朗之万研究所（ILL）的IN5、英国卢瑟福·阿普尔顿实验室（ISIS）的LET、美国国家标准与技术研究院（NIST）的DCS、德国慕尼黑工业大学（FRM-II）的TOFTOF、日本高能加速器研究机构（J-PARC）的AMATERAS、美国洛斯阿拉莫斯国家实验室（LANSCE）的PHAROS以及德国柏林亥姆霍兹材料与能源研究中心（HZB）的NEAT相同的能量和动量转移范围。对诸如样品位置处的中子通量和能量分辨率等关键指标的测量值，在测量结果与光线追踪蒙特卡罗模拟之间进行了比较，并且已达成良好的一致性（绝对数值偏差优于20%）。该仪器在冷中子和热中子能量范围内表现出色，有望成为中子散射领域用于准弹性和非弹性散射实验的主力设备。
