基于天光一号装置的激光直接驱动准等熵压缩研究

项目名称： 基于天光一号装置的激光直接驱动准等熵压缩研究

项目编号： No.11505299

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 张品亮

作者单位： 中国原子能科学研究院

项目金额： 23万元

中文摘要： 激光驱动准等熵压缩作为一种低温升、低熵增的动高压加载手段，在高压物理、惯性约束聚变等领域具有重要的研究价值和很强的需求牵引。近期发展起来的激光直接驱动方法，能有效提高能量利用率和峰值压力，引起国内外的广泛关注。本项目基于“天光一号”装置，利用其长上升沿的特点，通过采用非相干平滑技术提高光束均匀性，在不引入气库材料二级作用的情况下，开展激光直接驱动准等熵压缩的研究——激光直接照射Al靶、带LiF窗口Al靶和带LiF窗口台阶Al靶实现准等熵压缩，研究激光与靶作用实现准等熵压缩的机理和物理过程，建立一维理论模型模拟压缩波的传输过程和形成冲击波的临界条件，并与实验对比研究靶的结构参数、激光参数对准等熵加载效果的影响，探索获得激光直接驱动准等熵压缩的最佳条件和技术手段。本项目的实施将有助于明确激光直接驱动准等熵压缩加载的物理过程，也为开展高能量密度物理等相关研究提供了先进的实验技术手段。

中文关键词： 准等熵压缩；激光直接驱动；实验研究；物理过程

英文摘要： Laser-driven quasi-isentropic compression experiment is a shockless process where high pressure conditions can be accessed, and the accompanying temperature rise and entropy production is much less severe than shock compression, thus it has important research value. Direct laser-driven method is a recently developed technique, it can improve the energy utilization rate and pressure effectively, which attract extensive attention from worldwide. Therefore, for this project, the quasi-isentropic compression experiments were performed on the HEAVEN-I KrF excimer laser system without temporally pulse shaped and plasma loading, where the uniformity distribution of laser intensity is improved by Echelon Free Induced Spatial Incoherence (EFISI) technique. Direct laser-driven quasi-isentropic compression experiments on three kinds of aluminum targets. We will study interaction of laser-materials and physical processes, and build propagation model of compression wave. It reveals the relation of variant parameters (target and laser) to quasi-isentropic compression experiments. In brief, the successful implemental of this project not only makes clear the physical process of direct laser-driven quasi-isentropic compression, but also offers advanced experiment methods and favorable test conditions for future research on high energy density physics.

英文关键词： quasi-isentropic compression;direct laser-driven;experimental research;physical process