透明介质主冲击绝热线的高压声速连续测量

项目名称： 透明介质主冲击绝热线的高压声速连续测量

项目编号： No.11472255

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 李牧

作者单位： 中国工程物理研究院流体物理研究所

项目金额： 100万元

中文摘要： 主冲击绝热线上的高压声速测量是材料高压物性研究的重要内容，对于地球和行星物理、惯性约束聚变和武器物理等研究具有重要意义。本课题首次提出了利用成像型速度测量系统的空间演变信息，在测量冲击波速度的同时给出侧向稀疏下一维非定常冲击波的平面传播范围，有望提供一种TPa压力范围内的透明介质冲击声速的连续测量方法。课题拟采用高功率激光辐射驱动技术，给出石英、聚苯乙烯等透明介质主冲击绝热线上一段范围内的冲击波后声速，利用这种连续的声速测量结果，对开展高压下透明介质的Gruneisen系数修正，高压相变、压缩极限等问题研究。

中文关键词： 声速；主冲击绝热线；高能量密度物理；状态方程；透明介质

英文摘要： Measurement of sound velocity along principle Hugoniot is critical to several areas of high pressure physics, including geophysics,planetary astrophysics, inertial confinement fusion and weapon physics。A new measurement technique, which enables the study of response of transparet matters under single shock conpression into the TPa regime, is introduced firstly to get the bulk sound velocity continuously along principle Hugoniot curve in one shot.Experiments use an laser driven unsupported shock for which the pressure decays with time, while at the shock front still obey mass, momentum and energy conservation, and h hence the Rankine-Hugoniot relations.Thus, the attenuating shock samples a continuum of principle Hugoniot states.The line-imaging velocimeter for shock diagnostics can deliver space-time information as well as velocity history, which can be used to measure non-steady shock wave bending caused by side release.The trace of the side boundary of flat shock front can bridge a continuum of sound velocity information as the shock attenuates and shock front velocity at the same time.These information can be used in EOS　research, including Gruneisen coefficient correction, phase transition for transparet matters, such as quartz, megnesium oxide, diamond,and polyethylene, et al.

英文关键词： Sound velocity;principle Hugoniot;high energy and density physics;equation of state;transparent matters