高温烧蚀初始印记及其瑞利-泰勒不稳定性发展的研究  

Imprinting and consequent Rayleigh-Taylor growth

作　　者：方智恒[1] 王伟[1] 贾果[1] 董佳钦[1] 熊俊[1] 郑无敌[2] 李永升[2] 罗平庆[2] 傅思祖[1] 顾援[1] 王世绩[1] 

机构地区：[1]上海激光等离子体研究所,上海201800 [2]北京应用物理与计算数学研究所,北京100094

出　　处：《物理学报》2009年第10期7057-7061,共5页Acta Physica Sinica

基　　金：国家高技术研究发展计划(批准号:2008AA8041804);中国工程物理研究院科学技术发展基金(批准号:2008B0102010)资助的课题~~

摘　　要：直接驱动惯性约束聚变中,高温烧蚀初始印记在压缩过程的不稳定性发展中起着重要作用.利用X射线针孔辅助点投影成像法,研究了不同波形激光脉冲驱动下CH平面靶及其瑞利-泰勒不稳定性发展的情况.结果表明,在相同驱动激光能量作用下,初始阶段激光强度越低,上升越缓慢,高温烧蚀初始印记引起的密度调制幅度越大.提高预脉冲强度能显著抑制高温烧蚀初始印记效应.In direct drive inertial confinement fusion,surface perturbations seeded by imprint from laser intensity variations play an important role in Rayleigh-Taylor（RT）growth.Laser imprinting and consequent RT growth in planar CH targets driven by different pulse shapes have been investigated.The experimental results reveal that the range of density modulation induced by laser imprinting is larger when the driving laser has lower foot intensity and rises more slowly.Enhancing the pre-pulse intensity can restrain the effect of laser imprinting notablely.

关 键 词：高温烧蚀初始印记 激光脉冲形状 瑞利-泰勒不稳定性 针孔辅助点投影 

分 类 号：TL632[核科学技术—核技术及应用]