Towards a high-resolution TOF-MIEZE spectrometer with very cold neutrons
Towards a high-resolution TOF-MIEZE spectrometer with very cold neutrons
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DOI：
10.1016/j.nima.2017.03.014
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发表时间：
2017-07
影响因子：
1.4
通讯作者：
T. Oda;M. Hino;M. Kitaguchi;H. Filter;P. Geltenbort;Y. Kawabata
中科院分区：
文献类型：
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作者：
T. Oda;M. Hino;M. Kitaguchi;H. Filter;P. Geltenbort;Y. Kawabata
我们报告了首次使用极冷中子（VCN）的TOF-MIEZE技术进行高分辨率准弹性中子散射谱的实验测试。TOF-MIEZE是一种中子共振自旋回波光谱法，结合了飞行时间（TOF）方法和零努力强度调制（MIEZE）。在劳厄·朗之万研究所高通量反应堆的VCN束流口建造了一台紧凑型MIEZE仪器。通过累积原始数据的单个振荡，我们观察到在4-6 nm的波长带中具有50 kHz的有效频率的TOF-MIEZE信号。4 nm和6 nm波长的信号对比度分别为0.59±0.04和0.29±0.03。在实验装置中，用6 nm VCN估计傅立叶时间为70 ns。
We report the first experimental test of TOF-MIEZE technique using very cold neutrons (VCNs) towards high-resolution quasi-elastic neutron scattering spectroscopy. TOF-MIEZE is a type of neutron resonance spin echo spectroscopy with a combination of the time-of-flight (TOF) method and modulation of intensity by zero effort (MIEZE). A compact MIEZE instrument was constructed at the VCN beam port at the High Flux Reactor at the Institut Laue Langevin. By accumulating individual oscillations of raw data, we observed a TOF-MIEZE signal with an effective frequency of 50 kHz in a wavelength band of 4–6 nm. The signal contrasts were 0.59±0.04 and 0.29±0.03 for wavelengths of 4 nm and 6 nm, respectively. The Fourier time was estimated to be 70 ns with 6 nm VCNs in the experimental set-up.