A design study of VOR: A versatile optimal resolution chopper spectrometer for the ESS
A design study of VOR: A versatile optimal resolution chopper spectrometer for the ESS
复制标题
VOR 的设计研究：用于 ESS 的多功能最佳分辨率斩波光谱仪
DOI：
10.1051/epjconf/20158303002
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发表时间：
2014
期刊：
影响因子：
2.3
通讯作者：
R. Hall
中科院分区：
文献类型：
--
作者：
P. Deen;P. Deen;A. Vickery;A. Vickery;Ken Kjøller Andersen;Ken Kjøller Andersen;R. Hall;R. Hall
VOR是多功能最佳分辨率斩波光谱仪，设计用于探测由于通量限制而无法用于非弹性中子散射的动态现象。VOR是一种符合欧洲散裂源（ESS）标准的短仪器，30.2m慢慢剂到样品，并提供瞬时访问宽动态范围，在每个ESS周期内1-120 meV。较短的仪器长度与较长的ESS脉冲宽度相结合，即使在较长的波长下，也可以通过将能量分辨率从δ E/E = 1%放宽到δ E/E = 7%来实现二次通量增加。这在ESS的长斩波光谱仪和短脉冲源的仪器上都是不可能的。与目前的斩波光谱仪相比，VOR可以在等效能量分辨率下提供一个数量级的通量改进，Delta E/E = 1-3%。进一步放宽能量分辨率使VOR获得一个额外的数量级的通量。此外，VOR已针对重复率乘法（RRM）进行了优化，因此能够在单个ESS周期内测量6-14个入射波长，跨越9埃的波长带，采用新颖的斩波器配置，传输具有等效计数统计的所有入射波长。VOR的特点使其成为一种独特的仪器，能够访问小的、有限寿命的样品和非弹性中子散射的瞬态现象。
VOR, the versatile optimal resolution chopper spectrometer, is designed to probe dynamic phenomena that are currently inaccessible for inelastic neutron scattering due to flux limitations. VOR is a short instrument by the standards of the European Spallation Source (ESS), 30.2m moderator to sample, and provides instantaneous access to a broad dynamic range, 1-120 meV within each ESS period. The short instrument length combined with the long ESS pulse width enables a quadratic flux increase, even at longer wavelengths, by relaxing energy resolution from Delta E/E = 1% up to Delta E/E = 7%. This is impossible both on a long chopper spectrometer at the ESS and with instruments at short pulsed sources. In comparison to current day chopper spectrometers, VOR can offer an order of magnitude improvement in flux for equivalent energy resolutions, Delta E/E = 1-3%. Further relaxing the energy resolution enables VOR to gain an extra order of magnitude in flux. In addition, VOR has been optimised for repetition rate multiplication (RRM) and is therefore able to measure, in a single ESS period, 6-14 incident wavelengths, across a wavelength band of 9 angstrom with a novel chopper configuration that transmits all incident wavelengths with equivalent counting statistics. The characteristics of VOR make it a unique instrument with capabilities to access small, limited-lifetime samples and transient phenomena with inelastic neutron scattering.