摘要
根据神光-Ⅱ第九路高功率激光加载的特点,对传统静高压金刚石压砧装置进行了改进和优化设计,研制出了适合高功率激光加载条件下材料宽域状态方程研究的新型静高压靶.在神光-Ⅱ高功率激光装置上建立了基于静高压金刚石压砧和动高压激光相结合的材料宽域状态方程研究平台.利用这一平台开展了超纯水的宽域状态方程实验探索,获得了较好的实验结果.
Materials can be experimentally characterized up to terapascal pressures by sending a laser-induced shock wave through a sample that is pre-compressed inside a diamond-anvil cell. Pre-compression expands the ability to control the initial condition, allowing access to thermodynamic states from the principal Hugoniot and enter into the 10 TPa to 100 TPa (0.1-1 Gbar) pressure range that is relevant to planetary science. We demonstrate here a laser-driven shock wave in a water sample that is pre-compressed in a diamond anvil cell. The compression factors of the dynamic and static techniques are multiplied. This approach allows access to a family of Hugoniot curves which span the P-T phase diagram of fluid water to high density. According to the loading characteristics of the SG-II high-power laser, the traditional diamond anvil cell is improved and optimized, and a new diamond anvil cell target adapting to high power laser loading is developed. In order to adapt to laser shock, the diamond window should be thin (100 ~m) enough so that the shock can propagate to the sample before the side rarefaction erodes too much the shock planarity. With a thickness of 100 mm over an aperture of 600 ~m diameter, a pre-compressed water sample at 0.5 GPa can be obtained. The water is pre-compressed to 0.5 GPa by using the diamond anvil cell. Hugoniot curve is partially followed starting from pre-compression at a pressure of 0.5 GPa. Pressure, density, and temperature data for pre-compressed water are obtained in a pressure range from 150 GPa to 350 GPa by using the laser-driven shock compression technique. Our P-p-T data totally agree with the results from the model based on quantum molecular dynamics calculations. These facts indicate that this water model can be used as the standard for modeling interior structures of Neptune, Uranus, and exoplanets in the liquid phase in the multi-Mbar range and should improve our understanding of these types of planets.
作者
舒桦
涂昱淳
王寯越
贾果
叶君建
邓文
束海云
杨艳平
杜雪艳
谢志勇
贺芝宇
方智恒
华能
黄秀光
裴文兵
傅思祖
Shu Hua1) Tu Yu-Chun1) Wang Jun-Yue2) Jia Guo1) Ye Jun-Jian1) Deng Wen2) Shu Hai-Yun2) Yang Yah-Ping2) Du Xue-Yan2) Xie Zhi-Yong1) He Zhi-Yu1) Fang Zhi-Heng1) Hua Neng3) Huang Xiu-Guangl) Pei Wen-Bing1) Fu Si-Zu1)1) *(Shanghai Institute of Laser Plasmas, Shanghai 201800, China) 2) (Center for High Pressure Science and Technology Advance Research, Beijing 100094, China) 3) (Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2018年第6期102-107,共6页
Acta Physica Sinica
基金
科学挑战专题(批准号:TZ2016001)
国家重点研发计划(批准号:2017YFA0403200)资助的课题~~
关键词
静高压
状态方程
速度干涉仪
diamond anvil cell, equation of state, velocity interferometer