摘要
定量评估了驱动不对称性对靶球压缩的影响。对于不随时间变化不对称性驱动内爆,2维数值模拟结果表明:收缩比越小,驱动不对称性对靶球压缩变形和中子产额的影响越小;如果靶球压缩变形度为2.0,则相应的中子产额较少30%。改变黑腔长度,可得到不同时空性质辐射流,当腔长为1 350μm时,后来的反向不均匀性能消除前期不对称压缩的影响,最后压缩接近球形,内爆中子产额也最高。靶球压缩X光成像数值分析表明,用成像图的半高全宽(FWHM)值来分析燃料压缩变形特性是合理的。该研究结果已成功地用于神光Ⅱ间接驱动内爆物理实验的理论设计和测量数据分析。
Good radiation-driven symmetry is crucial for forming center hot spot in the indirect-driven inertial fusion.In this paper,our goal is to assess quantitatively the impacts of the radiation-driven asymmetry on the capsule compression.For the time-independent asymmetry,the 2D simulations show that the impact of the radiation-driven asymmetry on the capsule distortion and neutron yield will reduce as the convergence ratio of the capsule decreases.The neutron yield will degrade by 30% when the capsule distortion is about 2.0.In the hohlraums utilized in experiments,the asymmetry varies in space and time with different hohlraum lengths.For the length of 1 350 μm,the subsequent reversal of flux nonuniformity will be adequate to eliminate the effects of the earlier asymmetry,thus the capsule is nearly spherical at the maximum compression.In addition,the above results have been successfully used to design and analyse the implosion experiments in Shenguang Ⅱ facility.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2010年第5期1021-1025,共5页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(10975025)
计算物理实验室基金项目
国家高技术发展计划项目
关键词
不对称性
收缩比
靶球变形
产额降低
asymmetry
convergence ratio
capsule distortion
yield degradation
