Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany.
European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany.
J Synchrotron Radiat. 2023 Jul 1;30(Pt 4):671-685. doi: 10.1107/S1600577523003910. Epub 2023 Jun 15.
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 (≤10 s), 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 was observed during the fast compression of Au, while a strain rate of ∼1100 s was achieved during the rapid compression of N at 23 TPa s.
已在欧洲 X 射线自由电子激光（European XFEL）的高能密度（HED）仪器上开发出用于动态金刚石压腔（dDAC）研究的实验平台。利用欧洲 X 射线自由电子激光（European XFEL）的高重复率（高达 4.5 MHz），可以在中间应变速率（≤10 s）下对正在动态压缩的样品进行脉冲分辨 MHz X 射线衍射数据收集，在单个脉冲串中可以收集多达 352 张衍射图像。该设置采用压电驱动的 dDAC，能够在≥340 μs 内压缩样品，与脉冲串的最大长度（550 μs）兼容。介绍了在具有不同 X 射线散射能力的各种样品系统上进行快速压缩实验的结果。在 Au 的快速压缩过程中观察到 87 TPa s 的最大压缩率，而在 23 TPa s 时 N 的快速压缩过程中实现了约 1100 s 的应变速率。
