A MHz X-ray diffraction set-up for dynamic compression experiments in the diamond anvil cell.
A MHz X-ray diffraction set-up for dynamic compression experiments in the diamond anvil cell.
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DOI：
10.1107/s1600577523003910
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发表时间：
2023-07-01
影响因子：
2.5
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中科院分区：
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在欧洲XFEL的高能密度（HED）装置上，研制了一套MHz的X射线衍射装置，用于研究中等应变率下金刚石压砧动态压缩条件下材料的性能。在欧洲X射线自由电子激光器（XFEL）的高能密度（HED）装置上开发了一个动态金刚石对顶砧（dDAC）实验平台。利用欧洲XFEL的高重复频率（高达4.5 MHz），从样品中收集脉冲分辨MHz的X射线衍射数据，因为它们在中等应变率（≤103 s−1）下动态压缩，其中从单个脉冲序列可以收集多达352个衍射图像。 该装置采用压电驱动DAC，能够在≥340 µs内压缩样本，与脉冲串的最大长度（550 µs）兼容。 从快速压缩实验的结果在广泛的样品系统具有不同的X射线散射功率。在Au的快速压缩期间观察到87 TPa s-1的最大压缩速率，而在23 TPa s-1的N2的快速压缩期间实现了1000 s-1的应变速率。
A MHz X-ray diffraction set-up for the investigation of material behaviour under dynamic compression in a diamond anvil cell at intermediate strain rates has been developed at the High Energy Density (HED) instrument at the European XFEL. An experimental platform for dynamic diamond anvil cell (dDAC) research has been developed at the High Energy Density (HED) Instrument at the European X-ray Free Electron Laser (European XFEL). Advantage was taken of the high repetition rate of the European XFEL (up to 4.5 MHz) to collect pulse-resolved MHz X-ray diffraction data from samples as they are dynamically compressed at intermediate strain rates (≤103 s−1), where up to 352 diffraction images can be collected from a single pulse train. The set-up employs piezo-driven dDACs capable of compressing samples in ≥340 µs, compatible with the maximum length of the pulse train (550 µs). Results from rapid compression experiments on a wide range of sample systems with different X-ray scattering powers are presented. A maximum compression rate of 87 TPa s−1 was observed during the fast compression of Au, while a strain rate of ∼1100 s−1 was achieved during the rapid compression of N2 at 23 TPa s−1.
影响因子：
4.6
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