Unveiling the properties of Warm Dense Matter Cu by means of laser-driven shock compression coupled to time-resolved XAS

The Warm Dense Matter (WDM) state is an “exotic” state of matter which shows densities typical of solids and temperatures typical of plasmas. WDM is expected in the cores of giant planets (like Jupiter), in brown dwarfs, in small stars and in the core of Earth and in recently discovered extrasolar planets. WDM conditions are also produced in any laboratory experiment in which a solid is transformed to a plasma. A theoretical description of WDM is far from being achieved since conventional approximations that apply to solids or plasmas fail for such complex state and experimental data are scarce. We propose here to investigate the local ionic and electronic structure of WDM Cu up to 800 GPa by exploiting the new capabilities of the new High-Power laser facility (HPLF) at beamline ID24-ED

温稠密物质（Warm Dense Matter, WDM）是一类“奇异”的物质状态，其密度与固体的典型密度相当，温度则处于等离子体的典型温度区间。WDM被认为存在于巨行星（如木星）的核心、褐矮星、小型恒星、地球内核以及近年发现的系外行星内部。WDM的环境条件同样可在任何将固体转化为等离子体的实验室实验中复现。由于适用于固体或等离子体的常规近似方法无法适配这类复杂物质状态，且相关实验数据较为匮乏，目前尚未建立完善的WDM理论描述框架。本文拟依托光束线ID24-ED处的新型高功率激光装置（High-Power Laser Facility, HPLF）的全新功能，研究压强高达800 GPa下铜基WDM的局域离子与电子结构。