Exploiting the European-XFEL for a New Generation of Static Compression Research

利用欧洲 XFEL 进行新一代静态压缩研究

• 批准号: 2301718
• 金额: --
• 依托单位: University of Edinburgh
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2301718
• 关键词: Exploiting; European; XFEL; New; Generation

This project proposes to study the transformation dynamics of materials shocked using X-ray pulses in a diamond anvil cell (DAC) at the European-XFEL (X-ray free electron laser) facility in Hamburg. This project aims to study the response of materials to extreme strain rates, pressures and temperatures. Currently, AWE can access extreme conditions statically using standard DACs and toroidal DACs (currently under development), and dynamically using laser shocking (and to a lesser extent, gas guns). Fielding a DAC at XFEL, in essence, combines both techniques and should enable, through different thermodynamic pathways, access to new phase space for materials.Experiments will be carried out at the European XFEL facility in Hamburg using the High Energy Density (HED) beamline. Only XFEL can provide the high repetition rate of hard X-ray pulses required for these experiments. The initial objective is to send a train of energetic femtosecond X-ray pulses into the sample (already loaded into a DAC) to simultaneously, and rapidly, compress and heat the sample. Extremely fast detectors will be used to collect diffraction patterns during compression. Temperatures will be measured optically using streak spectro-radiometry technology. The ultimate goal is to develop a means of tuning the high strain rates, and consequently the pressures and temperatures induced in samples, through control of the X-ray pulse train. Understanding kinetic effects is critical to understanding phase transformations in materials under extreme conditions.

该项目提出在汉堡的欧洲XFEL（X射线自由电子激光）设施的金刚石砧室（DAC）中研究使用X射线脉冲冲击的材料的转变动力学。该项目旨在研究材料对极端应变率、压力和温度的响应。目前，AWE可以使用标准DAC和环形DAC（目前正在开发中）静态访问极端条件，并使用激光冲击（以及较小程度上的气枪）动态访问极端条件。在XFEL上部署DAC，本质上结合了两种技术，并且应该能够通过不同的热力学途径进入材料的新相空间。实验将在汉堡的欧洲XFEL设施中使用高能量密度（HED）光束线进行。只有XFEL可以提供这些实验所需的硬X射线脉冲的高重复率。最初的目标是将一系列高能飞秒X射线脉冲发送到样品中（已经加载到DAC中），同时快速压缩和加热样品。将使用极快的探测器来收集压缩过程中的衍射图案。温度将使用条纹光谱辐射测量技术进行光学测量。最终目标是开发一种通过控制X射线脉冲串来调整高应变率以及因此在样品中引起的压力和温度的方法。了解动力学效应对于了解极端条件下材料的相变至关重要。