Z箍缩先驱等离子体抑制及其对内爆过程的影响研究

项目名称： Z箍缩先驱等离子体抑制及其对内爆过程的影响研究

项目编号： No.11475153

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： 李正宏

作者单位： 中国工程物理研究院核物理与化学研究所

项目金额： 94万元

中文摘要： 快过程Z箍缩等离子体有极高的能量密度，在惯性约束聚变与强脉冲辐射源研究方面有重要价值。由于先驱等离子体存在，一方面会对负载中心填充体产生烧蚀而破坏其结构的完整性，另一方面会降低参与内爆的等离子体的质量与动能而影响整体内爆效果。对先驱等离子体进行合理调控，能改善Z箍缩等离子体能量加载与转化的有效性，是开展Z箍缩应用研究的前提。 本课题将系统研究负载初始构型对先驱等离子体形成与发展过程的影响，掌握通过调整负载初始构型来调制先驱等离子体的方法与技术，进而对Z箍缩等离子体内爆效果进行调控。首先在小装置上研究采用不同参数负载时先驱等离子体发光图像、发光功率波形、电流分流等，建立负载参数与先驱等离子体行为的关联。在此基础上，完善针对先驱等离子体调控的负载设计方法，并在更大装置上验证先驱等离子体调控方法的有效性及其整体内爆效果的影响。通过本课题研究，能深化Z箍缩物理过程的认识，增强负载设计的可靠性。

中文关键词： Z箍缩；先驱等离子体；等离子体诊断；负载设计；惯性约束聚变

英文摘要： Fast Z-pinch plasmas, which have extremely high energy density, are of great importance in initial confinement fusion and strong pulsed radiation source. The precursor plasma is inevitable in modern wire-array Z-pinch. On one hand, the precursor plasma can burn the target settled in the load center and destroy the structure of the target. On the other hand, existence of precursor plasmas will decrease the mass and energy of the main plasma and lead to the poor performance of the plasma implosion. Surpression of the precursor plasma can improve the effectiveness of the energy accumulation and trasformation of the plasma, which is the base for carry out Z-pinch application. This project will systematically investigate the influence of the load geometry of the formation and development of the precursor plasma, master the method and technology of controlling the precursor plasma, and enable us to design the implosion behavior of the Z-pinch plasma. First, we will investigate the radiation images, radiation power waveform and the current distribution of the precursor plasma while using different loads in small current facility, and obain the relationship between the load parameters and the precursor behavior. And then, based on the above investigation, we can enrich the load-designing method for modulating the precursor plasma, and perform experiments on checking the effectiveness of the precursor modulation and resulted implosion effect in the large current facility. These investigations, proposed in the requisition, can deepen our understanding on Z-pinch physical process and build up the reliability of load design.

英文关键词： Z-pinch;precursor plasma;plasma diagnostics;load design;inertial confinement fusion